Publications

2019

McRose, D. L., Lee, A., Kopf, S.Hl, Baars, O., Kraepiel, A. M. L., Sigman, D. M., Morel, F. M. M., Zhang, X., Effect of Iron Limitation on the Isotopic Composition of Cellular and Released Fixed Nitrogen in Azotobacter vinelandii.,  Geochimica et Cosmochimica Acta.  244, 12-23. (2019) doi: 10.1016/j.gca.2018.09.023.

2018

Fawcett, S. E., K. S. Johnson, S. C. Riser, N. V. Oostende, D. M. Sigman., Lo-nutrient organic matter in the Sargasso Sea thermocline: A hypothesis for its role, identity, and carbon cycle implications., Marine Chemistry. (2018) doi: 10.1016/j.marchem.2018.10.008

Wang, X. T., A. L. Cohen, V. Luu, H. Ren, Z. Su, G.H. Haug, D. M. Sigman, Natural forcing of the North Atlantic nitrogen cycle in the Anthropocene.  Proceedings of the National Academy of Sciences. (2018) doi: 10.1073/pnas.1801049115

Granger, J., D.M. Sigman, J. Gagnon, J.- E. Tremblay and A. Mucci, On the Properties of the Arctic Halocline and Deep Water Masses of the Canada Basin from Nitrate Isotope Ratios., Journal of Geophysical Research: Oceans. (2018) doi:10.1029/2018JC014110

Peng, X., S. E. Fawcett, N. van Oostende, M. J. Wolf, D. Marconi, D.M. Sigman, B. B. Ward, Nitrogen uptake and nitrification in the subarctic North Atlantic Ocean. Limnology and Oceanography, 63, 1462-1487.(2018) doi: 10.1002/lno.10784

Studer, A. S., D.M. Sigman, A. Martinez-Garcia, L. M. Thole, E. Michel, S.L. Jaccard, Jorg A. Lippold, Alain Mazaud, X.T. Wang, L. F. Robinson, J. F. Adkins and G. H. Haug. Increased nutrient supply tothe Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO2 rise. Nature Geoscience,  (2018) doi: 10.1038/s41561-018-0191-8

Smart, Sandi M., H. Ren, S. E. Fawcett, R. Schiebel, M. Conte, P.A. Rafter, K. K. Ellis, M. A. Weigand, S. Oleynik, G. H. Haug, D. M. Sigman. Ground-truthing the planktic foraminifer-bound nitorgen isotope paleo-proxy in the Sargasso Sea. Geochimica et Cosmochimica Acta, 235, 463-482. (2018) doi: 10.1016/j.gca.2018.05.023

Lueders-Dumont, J. A., X.T. Wang, O.P. Jensen, D.M. Sigman, B. B. Ward. Nitrogen isotopic analysis of carbonate-bound organic mattter in modern and fossil fish otoliths. Geochimica et Cosmochimica Acta, 224, 200-222.  (2018) doi: 10.1016/j.gca.2018.01.001

Hain, M. P., D.M. Sigman, J.A. Higgins and G. H. Haug.  Response to comment by Zeebe and Tyrrell on "The effects of secular calcium and magnesium concentration changes on the thermodynamics of seawater acid/base chemistry: Implications for the Eocene and Cretaceous ocean carbon chemistry and buffering" AGU, (2018) doi:  10.1002/2018GB005931  

2017

Rafter, P.A., D.M. Sigman, K. R. M. Mackey.  Recycled iron fuels new production in the eastern equatorial Pacific Ocean. Nature Communications, (8) 1100 (2017) doi: 10.1038/s41467-017-01219-7

Burls, N. J., A. V. Fedorov, D.M. Sigman, S. L. Jaccard, R. Tiedemann and G. H. Haug. Active Pacific meridional overturning circulation (PMOC) during the warm Pliocene.  Paleoceanography, 3 (9) e1700156 (2017) doi: 101126/sciadv.1700156

Marconi, D., D.M. Sigman, K.L. Casciotti, E. C. Campbell, M. A. Wiegand, S. E. Fawcett, A. N. Knapp, P.A. Rafter, B. B. Ward, G. H. Haug. Tropical Dominance of N2 Fixation in the North Atlantic Ocean. Global Biogeochemical Cycles, 31 (10) 1608-1623 (2017) doi: 10.1002/2016GB005613

Ren, H., D.M. Sigman, A. Martinez-Garcia, R.F. Anderson, M.-T. Chen, A.C. Ravelo, M. Straub, G. T. F. Wong and G. H. Haug.  Impact of glacial/interglacial sea level change on the ocean nitrogen cycle. PNAS, (2017)  doi: 10.1073/pnas.1701315114

Ren, H., Y-C Chen, X.T. Wang, G.T.F. Wong, A. L. Cohen, T.M. DeCarlo, M.A. Weigand, H-S Mii and D.M. Sigman. 21st-century rise in anthropogenic nitrogen deposition on a remote coral reef.  Science, 356, (6339),749-752. (2017)  doi:10.1126/science.aal3869

Duprey, N. N., X. T. Wang, P. D. Thompson, J. E. Pleadwell, L. J. Raymundo, K. Kim, D. M. Sigman and D. M. Baker.  Life and death of a sewage treatment plant recorded in a coral skeleton δ15N record. Marine Pollution Bulletin, doi: 10.1016/j.marpolbul.2017.04.023

Wang, X. T., D. M. Sigman, M. G. Prokopenko, J. F. Adkins, L. F. Robinson, S. K. Hines, J. Chai, A. S. Studer, A. Martinez-Garcia, T. Chen, G. H. Haug, Deep-sea coral evidence for lower Southern Ocean surface nitrate concentrations during the last ice age. Proceedings of the National Academy of Sciences, 114 (13), 3352-3357. (2017)  doi: 10.1073/pnas.1615718114

Van Oostende, N., S.E. Fawcett, D. Marconi, J. Lueders-Dumont, A.J.M. Sabadel, E.M.S. Woodward, B.F. Jönsson, D. M. Sigman, B. B. Ward. Variation of summer phytoplankton community composition and its relationship to nitrate and regenerated nitrogen assimilation across the North Atlantic Ocean. Deep-Sea Research Part I: Oceanographic Research Papers, (121) 79-94. (2017)  doi: 10.1016/j.dsr.2016.12.012

Marconi, D., S. Kopf, P. A. Rafter, D. M. Sigman. Aerobic respiration along isopycnals leads to overestimation of the isotope effect of denitrification in the ocean water column. Geochimica et Cosmochimica Acta, (197) 417-432.  (2017)  doi: 10.1016/j.gca.2016.10.012

2016

Frankowiak, K., X.T. Wang, D. M. Sigman, A. M. Gothmann, M. V. Kithara, M. Mazur, A. Meibom, J. Stolarski. Photosymbiosis and the expansion of shallow-water corals.  Science Advances. 2 (11) (2016) doi: 10.1126/sciadv.1601122

Marconi, D., S. Kopf, P. A. Rafter, D. M. Sigman. Aerobic respiration along isopycnals leads to overestimation of the isotope effect of denitrification in the ocean water column. Geochimica et Cosmochimica Acta. (2016)  doi: 10.1016/j.gca.2016.10.012

Kemeny, P.C., M.A. Weigand, R. Zhang, B.R. Carter, K. L. Karsh, S. E. Fawcett, D. M. Sigman.  Enzyme-level interconversion of nitrate and nitrite in the fall mixed layer of the Antarctic Ocean. Global Biogeochemical Cycles, 30, (7) 1069-1085. (2016) doi: 10.1002/2015GB005350

Zhang, E. J., D. M. Sigman, G. Wysocki.  Analysis of Nitric Oxide Isotopes via Differential Faraday Rotation Spectroscopy. CLEO OSA Technical Digest, (2016)  doi: 10.1364/CLEO_AT.2016.ATh3J.3

Weigand, M. A., J. Foriel, B. Barnett, S. Oleynik, D. M. Sigman. Updates to instrumentation and protocols for isotopic analysis of nitrate by the denitrifier method. Rapid Communications in Mass Spectrometry, 30, 1365-1383. (2016) doi: 10.1002/rcm.7570

Wang, X. T., D. M. Sigman, A. L. Cohen, D. J. Sinclair, R. M. Sherrell, K. M. Cobb,D. V. Erler, J. Stolarski, M. V. Kitahara, H. Ren. Influence of open ocean nitrogen supply on the skeletal δ 15 N of modern shallow-water scleractinian corals. Earth and Planetary Science Letters, 125-132. (2016) doi: 10.1016/j.epsl.2016.02.032

Rafter, P. A.,  and D. M. Sigman. Spatial distribution and temporal variation of nitrate nitrogen and oxygen isotopes in the upper equatorial Pacific Ocean.  Limnology and Oceanography, 61(1) 14-31, (2016) doi: 10.1002/lno.10152

Costa, K. M., J. F. McManus, R. F. Anderson, H. Ren, D. M. Sigman, G. Winckler, M. Q. Fleisher, F. Marcantonio and A.C. Ravelo. No iron fertilization in the equatorial Pacific Ocean during the last ice age. Nature, 529, 519-522. (2016) doi: 10.1038/nature16453

Altieri, K. E., S. E. Fawcett, A. J. Peters, D. M. Sigman, and M. G. Hastings. Marine biogenic source of atmospheric organic nitrogen in the subtropical North Atlantic. Proceedings of the National Academy of Sciences, 113, (4) 925-930. (2016)  doi: 10.1073/pnas.1516847113

2015

Smart, S. M., S. E. Fawcett, S. J. Thomalia, M. A. Weigand, C. J. C. Reason, D. M. Sigman.  Isotopic evidence for nitrification in the Antarctic winter mixed layer. Global Biogeochemical Cycles, (2015) doi: 10.1002/2014GB005013

Erler, D. V., X.T. Wang, D. M. Sigman, S. R. Schefferes, A. Martinez-Garcia, G. H. Haug. Nitrogen isotopic composition of organic matter from a 168 year-old coral skeleton: Implications for coastal nutrient cycling in the Great Barrier Reef Lagoon. Earth and Planetary Science Letters, (2015) doi: 10.1016/j.epsl.2015.11.023

Zhang, E. S. Huang, Q. Ji, M. Silvernagel, Y. Wang, B. Ward, D. M. Sigman and G. Wysocki. Nitric Oxide Isotopic Analyzer Based on a Compact Dual-Modulation Faraday Rotation Spectrometer. Sensors, 15(10)(2015) doi: 10.3390/s151025992

Ren, H., A. S. Studer, S. Serno, D. M. Sigman, G. Winckler, R. F. Anderson, S. Oleynik, R. Gersonde, G. H. Haug. Glacial-to-interglacial changes in nitrate supply and consumption in the subarctic North Pacific from microfossil-bound N isotopes at two trophic levels. Paleoceanography, 30, 1217-1232. (2015)  doi:10.1002/2014PA002765    (pdf)

Studer, A. J., D. M. Sigman, A.  Martínez-García, V. Benz, G. Winckler, G. Kuhn, O. Esper, F. Lamy, S. . Jaccard, L. Wacker, S. Oleynik, R. Gersonde and G. H. Haug. Antarctic Zone nutrient conditions during the last two glacial cycles. Paleoceanography, (2015)  doi: 10.1002/2014PA002745

Marconi, D., M. A. Weigand, P. A. Rafter, M. R. McIlbin, M. Forbes, K. L. Casciotti, D. M. Sigman. Nitrate isotope distributions on the US GEOTRACES North Atlantic cross-basin section: Signals of polar nitrate sources and low latitude nitrogen cycling. Marine Chemistry, (2015)  doi:10.1016/j.marchem.2015.06.007

Fawcett, S. E., B. B Ward, M. W. Lomas, D. M. Sigman.  Vertical decoupling of nitrate assimilation and nitrification in the Sargasso sea. Deep Sea Research Part 1: Oceanographic Research Papers, (2015) doi:10.1016/j.dsr.2015.05.004

Rohde, M. M., J. Granger, D. M. Sigman,M. F. Lehmann.  Coupled nitrate N and O stable isotope fractionation by a natural marine plankton consortium.  Frontiers in Marine Science, 2: 28 (2015) doi: 10.3389/fmars.2015.00028

Hain, M. P., D. M. Sigman, J. A. Higgins, G. H. Haug.  The effects of secular calcium and magnesium concentration changes on the thermodynamics of seawater acid/base chemistry: Implications for Eocene and Cretaceous ocean carbon chemistry and buffering. Global Biogeochemical Cycles, (2015) doi:10.1002/2014GB004986

Smart, S. M., S. E. Fawcett, S. J. Thomalia, M. A. Weigand, C. J. C. Reason, D. M. Sigman.  Isotopic evidence for nitrification in the Antarctic winter mixed layer. Global Biogeochemical Cycles,  (2015) doi: 10.1002/2014GB005013

Wang, X. T., D. M. Sigman, A. L. Cohen, D. J. Sinclair, R. M. Sherrell, M. A. Weigand, D. V. Erler, H. Ren. Isotopic composition of skeleton-bound organic nitrogen in reef-building symbiotic corals: A new method and proxy evaluation at Bermuda. Geochimica et Cosmochimica Acta, 148, 179-190, (2015). doi: 10.1016/j.gca.2014.09.017

2014

Hayes, C. T., A.   Martínez-Garcí, A. P. Hasenfratz, S. L. Jaccard, D. A. Hodell, D. M. Sigman, G. H. Haug, R. F. Anderson. A stagnation event in the deep South Atlantic during the last interglacial period. Science, 346, 1514-1517, (2014). doi: 10.1126/science.1256620

Erler, D. V., X. T. Wang, D. M. Sigman, S. R. Scheffers, B.O. Shepherd. Controls on the nitrogen isotopic composition of shallow water corals across a tropical reef flat transect. Coral Reefs, doi:10.1007/s00338-014-1215-5

Altieri, K.E., M. G. Hastings, A. J. Peters, S. Oleynik, D. M. Sigman.  Isotopic evidence for a marine ammonium source in rainwater at Bermuda. Global Biogeochemical Cycles, doi: 10.1002/2014GB004809

Wang, X. T., M. G. Prokopenko, D. M. Sigman, J.  F. Adkins, L. F. Robinson, H. Ren, S. Oleynik, B. Williams, G. H. Haug. Isotopic composition of carbonate-bound organic nitrogen in deep-sea scleractinian corals: A new window into past biogeochemical change. Earth and Planetary Science Letters, 400, 243-250, (2014). doi: 10.1016/j.epsl.2014.05.048

Morales, L. V., J. Granger, B.X. Chang, M. G. Prokopenko, B. Plessen, R. Gradinger, D. M. Sigman. Elevated 15N/14N in particulate organic matter, zooplankton, and diatom frustule-bound nitrogen in the ice-covered water column of the Bering sea eastern shelf. Deep Sea Research Part II: Topical Studies in Oceanography, (2014).  doi: 10.1016/j.dsr2.2014.05.008

Treibergs, L. A., S. E. Fawcett, M. W. Lomas, D. M. Sigman.  Nitrogen isotopic response of prokaryotic and eukaryotic phytoplankton to nitrate availability in Sargasso Sea surface waters.  Limnology and Oceanography, 59(3) 972-985 (2014).  doi: 10.4319/lo.2014.59.3.0972

Hain, M. P., D. M. Sigman, G. H. Haug.  Distinct roles of the Southern Ocean and North Atlantic in the deglacial atmospheric radiocarbon decline. Earth and Planetary Science Letters, 394, 198-208 (2014). doi: 10.1016/j.epsl.2014.03.020

Zhang, X., D. M. Sigman, F. M. M. Morel, A. M. L. Kraepiel.  Nitrogen isotope fractionation by alternative nitrogenases and past ocean anoxia.  Proceedings of the National Academy of Sciences, (2014). doi: 10.1073/pnas.1402976111

Martínez-García, A., D. M. Sigman, H. Ren, R. F. Anderson, M. Straub, D. A. Hodell, S. L. Jaccard, T. I. Eglinton, G. H. Haug. Iron fertilization of the subantarctic ocean during the last ice age. Science.  343, 1347-1350 (2014). doi: 10.1126/science.1246848

Fripiat, F., D. M. Sigman,S. E. Fawcett, P. A. Rafter, M. A. Weigand, J. L. Tison.  New insights into sea ice nitrogen biogeochemical dynamics from the nitrogen isotopes.  Global Biogeochemical Cycles. (2014).  doi: 10.1002/2013GB004729

Fawcett, S. E., M. W. Lomas, B. B. Ward and D. M. Sigman.  The counterintuitive effect of summer-to-fall mixed layer deepening on eukaryotic new production in the Sargasso Sea.Global Biogeochemical Cycles. (2014). doi: 10.1002/2013GB004579

Hain, M. P., D. M. Sigman, G. H. Haug.  8.18 The Biological Pump in the Past. The Oceans and Marine Geochemistry (2nd ed., Vol. 8, pp. 485-508). Elsevier Ltd. (2014). doi:10.1016/B978-0-08-095975-7.00618-5 

2013

Meckler, A. N., D. M. Sigman, K. A. Gibson, R. François, A. Martínez-García,S. L. Jaccard, U. Rohl, L. C. Peterson, R. Tiedemann and G. H. Haug.  Corrigendum: Deglacial pulses of deep-ocean silicate into the subtropical North Atlantic Ocean. Nature.  495, 495-498 (2013). doi: 10.1038/nature12906

Lawrence, K. T., D. M. Sigman, T. D. Gerbert, C. A. Riihimaki, C. T. Bolton, A. Martinez-Garcia, A. Rosell-Mele, and G. H. Haug.  Time-transgressive North Atlantic productivity changes upon Northern Hemisphere glaciation. Paleoceanography.  28: 740-751 (2013).  doi: 10.1002/2013PA002546

Gobel, A. R., K. E. Altieri, A. J. Peters, M. G. Hastings, and D. M. Sigman. Insights into anthropogenic nitrogen deposition to the North Atlantic investigated using the isotopic composition of aerosol and rainwater nitrate. Geophysical Research Letters. 40: 5977–5982, (2013).  doi: 10.1002/2013GL058167

Altieri, K. E., M. G. Hastings, A. R. Gobel, A. J. Peters and D. M. Sigman. Isotopic composition of rainwater nitrate at Bermuda: The influence of air mass source and chemistry in the marine boundary layer. Journal Of Geophysical Research-Atmospheres.  108: 1-13, (2013). doi: 10.1002/jgrd.50829

Granger, J., M. G. Prokopenko, C. W.  Mordy, and D. M. Sigman, The proportion of remineralized nitrate on the ice-covered eastern Bering Sea shelf evidenced from the oxygen isotope ratio of nitrate. Global Biogeochemical Cycles.  27: 1-10, (2013). doi: 10.1002/gbc.20075

Karsh, K. L., T. W. Trull, D. M. Sigman, P. A. Thompson, and J. Granger.  The contributions of nitrate uptake and efflux to isotope fractionation during algal nitrate assimilation. Geochemica et Cosmochimica Acta. (2013). doi: 10.1016/j.gca.2013.09.030

Rafter, P. A., P. J. DiFiore, and D. M. Sigman,  Coupled nitrate nitrogen and oxygen isotopes and organic matter remineralization in the Southern and Pacific Oceans. Journal Of Geophysical Research-Oceans. 118: 1-14, (2013).  doi: 10.1002/jgrc.20316

Ren, H., B. G. Brunelle, D. M. Sigman, and R. S.  Robinson, Diagenetic aluminum uptake into diatom frustules and the preservation of diatom-bound organic nitrogen. Marine Chemistry. 155: 92-101, (2013).
doi: 10.1016/j.marchem.2013.05.016

Studer, A. S., K. K. Ellis, S. Oleynik, D. M. Sigman, and G. H. Haug,  Size-specific opal-bound nitrogen isotope measurements in North Pacific sediments. Geochemica et Cosmochimica Acta. 129: 179-194, (2013). doi: 10.1016/j.gca.2013.06.041

Prokopenko, M. G., M. B. Hirst, L. DeBrabandere, D.J.P. Lawrence, W. M. Berelson, J. Granger, B.X. Chang, S. Dawson, E. J. Crane III, L. Chong, B. Thamdrup, A. Townsend-Small and D. M. Sigman, Nitrogen losses in anoxicmarine sediments driven by Thioploca–anammox bacterial consortia, Nature, 500, 194-200, (2013). doi:10.1038/nature12365

Straub, M., D. M. Sigman, H. Ren, A. Martinez-Garcia, A. N. Meckler, M. P. Hain, G. H. Haug, Changes in North Atlantic nitrogen fixation controlled by ocean circulation, Nature, 2013/08/21/online, (2013). doi: 10.1038/nature12397

Meckler, A. N., D. M. Sigman, K. A. Gibson, R. Francois, A. Martinez-Garcia, S. L. Jaccard, U. Röhl, L. C. Peterson, R. Tiedemann and G. H. Haug, Deglacial pulses of deep-ocean silicate into the subtropical North Atlantic Ocean, Nature, 495 (7442), 495-498, (2013). doi: 10.1038/nature12006

Jaccard, S. L., C. T. Hayes, A. Martinez-Garcia, D. A. Hodell, R. F. Anderson, D. M. Sigman and G. H. Haug, Two Modes of Change in Southern Ocean Productivity Over the Past Million Years, Science, 339: 1419-1423, (2013).  doi: 10.1126/science.1227545

Deplazes, G., A. Lückge, L. C. Peterson, A. Timmermann, Y. Hamann, K. A. Hughen, U. Röhl, C. Laj, M. A. Cane, D. M. Sigman and G. H. Haug, Links between tropical rainfall and North Atlantic climate during the last glacial period, Nature Geoscience, (2013). doi: 10.1038/NGEO1712  

Morales, L. V., D. M. Sigman, M. G. Horn and R. S. Robinson, Cleaning methods for the isotopic determination of diatom bound nitrogen in non-fossil diatom frustules, Limnology and Oceanography: Methods,11: 101-112, (2013)  doi:10.4319/lom.2013.11.101

Straub, M., M. M. Tremblay, D. M. Sigman, A. S. Studer, H. Ren, J. R. Toggweiler and G. H. Haug, Nutrient conditions in the subpolar North Atlantic during the last glacial period reconstructed from foraminifera-bound nitrogen isotopes, Paleoceanography,  28, 1–12,(2013).  doi: 10.1002/palo.20013

2012

Studer, A. S., A. Martinez-Garcia, S. L. Jaccard, F. E. Girault, D. M. Sigman, G. H. Haug, Enhanced stratification and seasonality in the Subarctic Pacific upon Northern Hemisphere Glaciation–New evidence from diatom-bound nitrogen isotopes, alkenones and archaeal tetraethers, Earth and Planetary Science Letters, (351-352): 84-94, (2012).  doi: 10.1016/j.epsl.2012.07.029 

Kritee, K., D. M. Sigman, J. Granger, B. B. Ward, A. Jayakumar, C. Deutsch, Reduced isotope fractionation by denitrification under conditions relevant to the ocean, Geochimica et Cosmochimica Acta (92): 243-259, (2012).  doi: 10.1016/j.gca.2012.05.020

Ren, H., D. M. Sigman, R. C. Thunell and M. G. Prokopenko, Nitrogen isotopic composition of planktonic foraminifera from the modern ocean and recent sediments, Limnology and Oceanography, 57(4): 1011-1024, (2012).   doi: 10.4319/lo.2012.57.4.1011

Knapp, A. N., D. M. Sigman, A. B. Kustka, S. A. Sañudo-Wilhelmy, D. G. Capone, The distinct nitrogen isotopic compositions of low and high molecular weight marine DON, Marine Chemistry (136-137): 24-33, (2012).  doi: 10.1016/j.marchem.2012.05.001

Kwon, E. Y., M. P. Hain, D. M. Sigman, E. D. Galbraith, J. L. Sarmiento and J. R. Toggweiler, North Atlantic ventilation of “southern-sourced” deep water in the glacial ocean. Paleoceanography 27, PA2208, 12pp., (2012).  doi:10.1029/2011PA002211

Ren, H., D. M. Sigman, M.-T. Chen and S.-J. Kao, Elevated foraminifera-bound nitrogen isotopic composition during the last ice age in the South China Sea and its global and regional implications, Global Biogeochemical Cycles 26, GB1031, (2012).  doi:10.1029/2010GB004020

Silver, B. J., R. Raymond, D. M. Sigman, M. Prokopenko, B.S. Lollar, G. Lacrampe-Couloume, M.L. Fogel, L.M. Pratt, L. Lefticariu and T.C. Onstott, The origin of NO 3− and N 2 in deep subsurface fracture water of South Africa, Chemical Geology, (294-295): 51-62, (2012).  doi:10.1016/j.chemgeo.2011.11.017

Brookshire, E.N.J., L.O. Hedin, J.D. Newbold, D. M. Sigman, J. K. Jackson, Sustained losses of bioavailable nitrogen from montane tropical forests, Nature Geoscience, 5 (2): 123-126, (2012).  doi:10.1038/NGEO1372

Rafter, P.A., D. M. Sigman, C.D. Charles, J. Kaiser, G.H. Haug, Subsurface tropical Pacific nitrogen isotopic composition of nitrate: Biogeochemical signals and their transport, Global Biogeochemical Cycles, 26, GB1003, (2012).  doi:10.1029/2010GB003979

Altieri, K.E., M.G. Hastings, A.J. Peters, and D. M. Sigman, Molecular characterization of water soluble organic nitrogen in marine rainwater by ultra-high resolution electrospray ionization mass spectrometry, Atmospheric Chemistry and Physics, 12, 3557-3571, (2012).  doi:10.5194/acp-12-3557-2012

Sigman, D. M., M. P. Hain, The Biological Productivity of the Ocean: Section 1, Nature Education Knowledge 3(6): 21, (2012).  (pdf)

Karsh, K. L., J. Granger, K. Kritee and D. M. Sigman, Eukaryotic assimilatory nitrate reductase fractionates N and O Isotopes with a ratio near unity. Environmental Science and Technology, 46 (11): 5727-35, (2012)  doi:10.1021/es204593q (pdf)

2011

Meckler, A. N., H. Ren, D. M. Sigman, N. Gruber, B. Plessen, C.J. Schubert, G. H. Haug, Deglacial nitrogen isotope changes in the Gulf of Mexico: Evidence from bulk sedimentary and foraminifera-bound nitrogen in Orca Basin sediments. Paleoceanography, 26, PA4216, (2011). doi:10.1029/2011PA002156

Granger, J., M. G. Prokopenko, D. M. Sigman, C.W. Mordy, Z. M. Morse, L.V. Morales, R. N. Sambrotto and B. Plessen, Coupled nitrification-denitrification in sediment of the eastern Bering Sea shelf leads to 15   N enrichment of fixed N in shelf waters, Journal of Geophysical Research, 116, C11006 (2011). doi:10.1029/2010JC006751

Prokopenko, M. G., D. M. Sigman, W. M. Berelson, D. E. Hammond, B. Barnett, L. Chong, A. Townsend-Small, Denitrification in anoxic sediments supported by biological nitrate transport, Geochimica et Cosmochimica Acta, (2011).  doi:10.1016/j.gca.2011.09.023

Knapp, A. N., D. M. Sigman, F. Lipschultz, A. B. Kustka and D. G. Capone, Interbasin isotopic correspondence between upper-ocean bulk DON and subsurface nitrate and its implications for marine nitrogen cycling, Global Biogeochemical Cycles, 25, GB4004, (2011) doi:10.1029/2010GB003878

Fawcett, S.E.,  M. W. Lomas, J. R. Casey, B. B. Ward and D. M. Sigman, Assimiliation of upwelled nitrate by small eukaryotes in the Sargasso Sea, Nature Geoscience, 4: 717-722 (2011). doi:10.1038/NGEO1265

Martinez-Garcia, A., A. Rosell-Mele, S. L. Jaccard, W. Geibert, D. M. Sigman, and G. H. Haug, Southern Ocean dust-climate coupling over the past four million years, Nature, 476 (7360), 312-U141, (2011).  doi:10.1038/nature10310

Horn, M. G., R. S. Robinson, T. A. Rynearson, and D. M. Sigman, Nitrogen isotopic relationship between diatom-bound and bulk organic matter of cultured polar diatoms, Paleoceanography, 26, PA3208, (2011).  doi:10.1029/2010PA002080

Wolff, C., G. H. Haug, A. Timmermann, J. S. S. Damste, A. Brauer, D. M. Sigman, M. A. Cane, and D. Verschuren, Reduced Interannual Rainfall variability in East Africa during the Last Ice Age, Science, 333 (6043), 743-747, (2011). doi:10.1126/science.1203724

Hain, M. P., D. M. Sigman, and G. H. Haug, Shortcomings of the isolated abyssal reservoir model for deglacial radiocarbon changes in the mid-depth Indo-Pacific Ocean, Geophysical Research Letters, 38, L04604, (2011).  doi:10.1029/2010GL046158

2010

Hain, M. P., D. M. Sigman, and G. H. Haug, Carbon dioxide effects of Antarctic stratification, North Atlantic Intermediate Water formation, and subantarctic nutrient drawdown during the last ice age: Diagnosis and synthesis in a geochemical box model, Global Biogeochemical Cycles, 24, GB4023, (2010)  doi:10.1029/2010GB003790

Brunelle, B. G., D. M. Sigman, S. L. Jaccard, L. D. Keigwin, B. Plessen, G. Schettler, M. S. Cook, and G. H. Haug, Glacial/interglacial changes in nutrient supply and stratification in the western subarctic North Pacific since the penultimate glacial maximum, Quaternary Science Reviews, 29(19-20): 2579-2590, (2010)  doi:10.1016/j.quascirev.2010.03.010

DiFiore, P. J., D. M. Sigman, K. L. Karsh, T. W. Trull, R. B. Dunbar, and R. S.Robinson, Poleward decrease in the isotope effect of nitrate assimilation across the Southern Ocean, Geophysical Research Letters, 37, L17601,  (2010) doi:10.1029/2010gl044090

Sigman, D. M., M. P. Hain, and G. H. Haug, The polar ocean and glacial cycles in atmospheric CO2 concentration, Nature, 466, 47-55, (2010) doi:10.1038/nature09149

Jaccard, S. L., E. D. Galbraith, D. M. Sigman, and G. H. Haug, A pervasive link between Antarctic ice core and subarctic Pacific sediment records over the past 800 kyrs, Quaternary Science Reviews 29, 206-212, (2010) doi:10.1016/j.quascirev.2009.10.007

Granger, J., D. M. Sigman, M. M. Rohde, M. T. Maldonado, and P. D. Tortell, N and O isotope effects during nitrate assimilation by unicellular prokaryotic and eukaryotic plankton cultures, Geochimica et Cosmochimica Acta 74 (3), 1030-1040, (2010) doi:10.1016/j.gca.2009.10.044

Knapp, A. N., M. G. Hastings, D. M. Sigman, F. Lipschultz, and J. N. Galloway, The flux and isotopic composition of reduced and total nitrogen in Bermuda rain, Marine Chemistry, 120: (1-4) 83-89,(2010) doi:10.1016/j.marchem.2008.08.007

2009

DiFiore, P. J., D. M. Sigman, R. B. Dunbar, and Y. Wang, Upper ocean nitrogen fluxes in the Polar Antarctic Zone: Constraints from nitrogen and oxygen isotopes of nitrate, Geochemistry, Geophysics, Geosystems, 10, Q11016, (2009)  doi:10.1029/2009GC002468

Granger, J., and D. M. Sigman, Removal of nitrite with sulfamic acid for nitrate N and O isotope analysis with the denitrifier method, Rapid Communications in Mass Spectrometry, 23, 3753–3762, (2009)  doi:10.1002/rcm.4307

De Pol-Holz, R., R. S. Robinson, D. Hebbeln, D. M. Sigman, O. Ulloa, Controls on sedimentary N isotopes along the Chile margin, Deep-Sea Research Part II: Topical Studies in Oceanography, 56 (16), 1042-1054, (2009) doi:10.1016/j.dsr2.2008.09.014

Sigman, D. M., P. J. DiFiore, M. P. Hain, C. Deutsch, Y. Wang, D. M. Karl, A. N. Knapp, M. F. Lehmann, and S. Pantoja, The dual isotopes of deep nitrate as a constraint on the cycle and budget of oceanic fixed nitrogen, Deep-Sea Research I, (2009) doi:10.1016/j.dsr.2009.04.007

Sigman, D. M., K.L. Karsh, and K. L. Casciotti, Nitrogen isotopes in the ocean, in Encyclopedia of Ocean Sciences (update from 2001), edited by J.H. Steele, K.K. Turekian, and S.A. Thorpe, Academic Press, London, (2009)   (pdf)

Sigman, D. M., P. J. DiFiore, M. P. Hain, C. Deutsch, and D. M. Karl, Sinking organic matter spreads the nitrogen isotope signal of pelagic denitrification in the North Pacific, Geophys. Res. Lett., 36, L08605, (2009) doi:10.1029/2008GL035784

Haug, G. H., and Sigman, D. M., Palaeoeoceanography: Polar Twins, Nature Geosciences, 2, 91-92, (2009) doi:10.1038/ngeo423

Jaccard, S. L., E. D. Galbraith, D. M. Sigman, G. H. Haug, R. Francois, T. F. Pedersen, P. Dulski, H. R. Thierstein, Subarctic Pacific evidence for a glacial deepening of the oceanic respired carbon pool, Earth and Planetary Science Letters, 277, 156–165, (2009) doi:10.1016/j.epsl.2008.10.017 

Ren, H., D. M. Sigman, A. N. Meckler, B. Plessen, R. S. Robinson, Y. Rosenthal, and G. H. Haug, Foraminiferal isotope evidence of reduced nitrogen fixation in the ice age Atlantic Ocean, Science, 323, 244-248, (2009)  doi:10.1126/science.1165787 (pdf)

2008

Granger, J., D. M. Sigman, M. F. Lehmann, and P. D. Tortell, Nitrogen and oxygen isotope fractionation of during dissimilatory nitrate reduction by denitrifying bacteria, Limnology and Oceanography 53(6), 2533-2545, (2008)  (pdf)

Galbraith, E. D., D. M. Sigman, R. S. Robinson, T. F. Pedersen, "Nitrogen in Past Marine Environments", in Nitrogen in the Marine Environment (2nd edition), edited by D. G. Capone, D. A. Bronk, M. R. Mulholland, and, E. J. Carpenter, Chapter 34, 1497-1535, ISBN: 978-0-12-372522-6, Academic Press, (2008)  (pdf)

Knapp, A. N., P. J. DiFiore, C. Deutsch, D. M. Sigman, and F. Lipschultz, Nitrate isotopic composition between Bermuda and Puerto Rico: Implications for N2 fixation in the Atlantic Ocean, Global Biogeochemical Cycles, 22, GB3014, (2008) doi:10.1029/2007GB003107    (pdf)

Brauer, A., G.H. Haug, P. Dulski, D.M. Sigman, J.F.W. Negendank, An abrupt wind shift in Western Europe at the onset of the Younger Dryas cold period, Nature Geosciences, 1, 520-523, (2008) doi:10.1038/ngeo263    (pdf)

Robinson, R.S., and D. M. Sigman, Nitrogen isotopic evidence for a poleward decrease in surface nitrate within the ice age Antarctic, Quaternary Science Reviews, 27, 1076–1090, (2008) doi:10.1016/j.quascirev.2008.02.005    (pdf)

Galbraith, E. D., M. Kienast, S. L. Jaccard, T. F. Pedersen, B. G. Brunelle, D. M. Sigman, and T. Kiefer, Consistent relationship between global climate and surface nitrate utilization in the western subarctic Pacific throughout the last 500 ka, Paleoceanography, 23, PA2212, (2008) doi:10.1029/2007PA001518

de Boer, A. M., J. R. Toggweiler, and D. M. Sigman, Atlantic dominance of the meridional overturning circulation, Journal of Physical Oceanography, 38(2), 435-450,(2008)  doi:10.1175/2007JPO3731.1  (pdf)

2007

Meckler, A. N., G. H. Haug, D. M. Sigman, B. Plessen, L. C. Peterson, and H. R. Thierstein, Detailed sedimentary N isotope records from Cariaco Basin for Terminations I and V: Local and global implications, Global Biogeochemical Cycles, 21, GB4019, (2007)  doi:10.1029/2006GB002893   (pdf)

Lehmann, M. F., D. M. Sigman, D. C. McCorkle, J. Granger, S. Hoffman, G. Cane and B. G. Brunelle, The distribution of nitrate 15N/14N in marine sediments and the impact of benthic nitrogen loss on the isotopic composition of oceanic nitrate, Geochimica et Cosmochimica Acta, 71, 5384–5404, (2007) doi:10.1016/j.gca.2007.07.025    (pdf)

Galbraith, E. D., S. L. Jaccard, T. F. Pedersen, D. M. Sigman, G. H. Haug, M. Cook, J. R. Southon and R. Francois, Carbon dioxide release from the North Pacific abyss during the last deglaciation, Nature, 449, (2007)  doi:10.1038/nature06227

Sigman, D. M. A. M. de Boer, and G. H. Haug, Antarctic stratification, atmospheric water vapor, and Heinrich events: A hypothesis for late Pleistocene deglaciations, in Past and Future Changes of the Oceanic Meridional Overturning Circulation: Mechanisms and Impacts, Schmittner, A., J. H. C. Chiang, and S. R. Hemming, Eds., AGU Geophysical Monograph Series 173, 335-349,  (2007)  doi:10.1029/173GM21   (pdf) 

Houlton, B. Z., D. M. Sigman, E. A. G. Schuur, and L. O. Hedin, A climate-driven switch in plant nitrogen acquisition within tropical forest communities, Proceedings of the National Academy of Sciences, 104, 21, 8902–8906, (2007) doi:10.1073/pnas.0609935104

de Boer, A. M., D. M. Sigman, J. R. Toggweiler, and J. L. Russell, The effect of global ocean temperature change on deep ocean ventilation, Paleoceanography, 22, PA2210, (2007)  doi:10.1029/2005PA001242   (pdf)

Savarino, J., J. Kaiser, S. Morin, D. M. Sigman, and M. H. Thiemens, Nitrogen and oxygen isotopic constraints on the origin of atmospheric nitrate in coastal Antarctica, Atmospheric Chemistry and Physics, 7, 1925–1945, (2007)  doi:10.5194/acp-7-1925-2007  (pdf)

Brunelle, B. G., D. M. Sigman, M. S. Cook, L. D. Keigwin, G. H. Haug, B. Plessen, G. Schettler, and S. L. Jaccard, Evidence from diatom-bound nitrogen isotopes for Subarctic Pacific stratification during the last ice age and a link to North Pacific denitrification changes, Paleoceanography, 22, PA1215,(2007) doi:10.1029/2005PA001205    (pdf)

Kaiser, J., M. G. Hastings, B. Z. Houlton, T. Röckmann, and D. M. Sigman, Triple oxygen isotope analysis of nitrate using the denitrifier method and thermal decomposition of N2O, Analytical Chemistry, 79, 599-607, (2007)  doi:10.1021/ac061022s

Deutsch, C., J. L. Sarmiento, D. M. Sigman, N. Gruber, and J. P. Dunne, Spatial coupling of nitrogen inputs and losses in the ocean, Nature, 445, 163-167, (2007) doi:10.1038/nature05392

Yancheva, G., N. R. Nowaczyk, J. Mingram, P. Dulski, G. Schettler, J. F. W. Negendank, J. Liu, D. M. Sigman, L. C. Peterson, and G. H. Haug, Influence of the Intertropical Convergence Zone on the East Asian Monsoon, Nature, 445, 74-77, (2007) doi:10.1038/nature05431

Yancheva, G., N. R. Nowaczyk, J. Mingram, P. Dulski, G. Schettler, J. F. W. Negendank, J. Liu, D. M. Sigman, L. C. Peterson, and G. H. Haug, Reply to “Anti-correlation of summer/winter monsoons?”, Nature, 450, E8-E9, (2007b) doi:10.1038/nature06339

Yancheva, G., N. R. Nowaczyk, J. Mingram, P. Dulski, G. Schettler, J. F. W. Negendank, J. Liu, D. M. Sigman, L. C. Peterson, and G. H. Haug, Reply to “Record of winter monsoon strength”, Nature, 450, E11, (2007c)  doi:10.1038/nature06409

2006

Granger, J., D. M. Sigman, M. Prokopenko, M. F. Lehmann, and P. D. Tortell, A method for nitrite removal in nitrate N and O isotope analysis, Limnology and Oceanography: Methods, 4, 205-212, (2006)   (pdf)

DiFiore, P. J., D. M. Sigman, T. W. Trull, A. J. Lourey, and K. L. Karsh, Nitrogen isotope constraints on Subantarctic biogeochemistry, Journal of Geophysical Research – Oceans, 111, C8, C08016, (2006) doi:10.1029/2005JC003216    (pdf)

Houlton, B. Z., D. M. Sigman, and L. O. Hedin, Isotopic evidence for large gaseous nitrogen losses from tropical rainforests, Proceedings of the National Academy of Sciences, 103, 23, 8745-8750, (2006)  doi:10.1073/pnas.0510185103   (pdf)
 

2005

Hastings, M. G., D. M. Sigman, and E. J. Steig, Glacial/interglacial changes in the isotopes of nitrate from the Greenland Ice Sheet Project 2 (GISP2) ice core, Global Biogeochemical Cycles, 19, GB4024, (2005)  doi:10.1029/2005GB002502   (pdf)

Sigman, D. M., J. Granger, P. DiFiore, M. F. Lehmann, A. v. Geen, R. Ho, and G. Cane, Coupled nitrogen and oxygen isotope measurements of nitrate along the eastern North Pacific margin, Global Biogeochemical Cycles, 19, GB4022, (2005) doi:10.1029/2005GB002458    (pdf)

Lehmann, M. F., D. M. Sigman, D. C. McCorkle, B. G. Brunelle, S. Hoffmann, M. Kienast, G. Cane, and J. Clement, The origin of the deep Bering Sea nitrate deficit -- Constraints from the nitrogen and oxygen isotopic composition of water column nitrate and benthic nitrate fluxes, Global Biogeochemical Cycles, 19, GB4005, (2005) doi:10.1029/2005GB002508    (pdf)

Jaccard, S. L., Haug, G. H., Sigman, D. M., Pedersen, T. F., Thierstein, H. R., Röhl. U., Glacial/interglacial changes in Subarctic North Pacific stratification, Science, 308,1003-1006, (2005) doi:10.1126/science.1108696 (pdf)

Robinson, R. S., D. M. Sigman, P. J. DiFiore, M. M. Rohde, T. A. Mashiotta, and D. W. Lea, Diatom-bound 15N/14N: New support for enhanced nutrient consumption in the ice age Subantarctic, Paleoceanography, 20, PA3003, (2005) doi:10.1029/2004PA001114   (pdf)

Haug, G. H., A. Ganopolski, D. M. Sigman, A. Rosell-Mele, G. E. A. Swann, R. Tiedemann, S. L. Jaccard, J. Bollmann, M. A. Maslin, M. J. Leng, and G. Eglinton, North Pacific seasonality and the glaciation of North America 2.7 million years ago, Nature, 433, 821-825, (2005)  doi:10.1038/nature03332   (pdf)

Knapp, A. N., D. M. Sigman, and F. Lipschultz, N isotopic composition of dissolved organic nitrogen and nitrate at the Bermuda Atlantic time-series study site, Global Biogeochemical Cycles, 19, GB1018, (2005) doi:10.1029/2004GB002320    (pdf)

2004

Hastings, M. G., E. J. Steig, and D. M. Sigman, Seasonal variations in N and O isotopes of nitrate in snow at Summit, Greenland: Implications for the study of nitrate in snow and ice cores, Journal of Geophysical Research – Atmospheres, 109, D20306, (2004)  doi:10.1029/2004JD004991    (pdf)

Deutsch, C., D. M. Sigman, R. C. Thunell, N. Meckler, and G. H. Haug, Isotopic constraints on glacial/interglacial changes in the oceanic nitrogen budget, Global Biogeochemical Cycles, 18, GB4012, (2004) doi:10.1029/2003GB002189    (pdf)

Granger, J., D. M. Sigman, J. A. Needoba, and P. J. Harrison, Coupled nitrogen and oxygen isotope fractionation of nitrate during assimilation by cultures of marine phytoplankton, Limnology and Oceanography, 49, 5 , 1763-1773, 2004. (pdf)

Robinson, R. S., B. G. Brunelle and D. M. Sigman, Revisiting nutrient utilization in the glacial Antarctic: Evidence from a new method for diatom-bound N isotopic analysis, Paleoceanography, 19, 3, PA3001, (2004) doi:10.1029/2003PA000996    (pdf)

Thunell, R. C., D. M. Sigman, F. Muller-Karger, Y. Astor and R. Varela, The nitrogen isotope dynamics of the Cariaco Basin, Venezuela, Global Biogeochemical Cycles, 18, 3, GB3001, (2004) doi:10.1029/2003GB002185     (pdf)

Lehmann, M. F., D. M. Sigman, and W. M. Berelson,  Coupling the 15N/14N and 18O/16O of nitrate as a constraint on benthic nitrogen cycling, Marine Chemistry, 88, 1-20, (2004)  doi:10.1016/j.marchem.2004.02.001     (pdf)

Needoba, J. A., D. M. Sigman, P. J. Harrison, The mechanism of isotope fractionation by algal nitrate assimilation as illuminated by the 15N/14N of intracellular nitrate, Journal of Phycology, 40, 517–522, (2004)  doi:10.1111/j.1529-8817.2004.03172.x     (pdf)

Sigman, D. M., S. L. Jaccard, and G. H. Haug, Polar ocean stratification in a cold climate, Nature, 428, 59-63, (2004)   (pdf)

2003

Hastings, M. G., D. M. Sigman, and F. Lipschultz, Isotopic evidence for source changes of nitrate in rain at Bermuda, Journal of Geophysical Research – Atmospheres, 108, D24, 4790, (2003) doi:10.1029/2003JD003789    (pdf)

Sigman, D. M., and G. H. Haug, Biological Pump in the Past, in Treatise On Geochemistry, edited by H.D. Holland and K.K. Turekian (H. Elderfield, volume editor), Elsevier Science, Oxford, (2003)  (pdf)

Saito, M. A., D. M. Sigman, and F.M.M. Morel, The bioinorganic chemistry of the ancient ocean: the co-evolution of cyanobacterial metal requirements and biogeochemical cycles at the Archean/Proterozoic boundary? Inorganica Chimica Acta, 356C, 308-318, (2003)  doi:10.1016/S0020-1693(03)00442-0

Sigman, D. M., S. J. Lehman, and D. W. Oppo, Evaluating mechanisms of nutrient depletion and 13C enrichment in the intermediate-depth Atlantic during the last ice age, Paleoceanography, 18, 3, 1072, (2003) doi:10.1029/2002PA000818   (pdf)

Lourey, M. J., T. W. Trull, D.M. Sigman, Sensitivity of d15N of nitrate, surface suspended and deep sinking particulate nitrogen to seasonal nitrate depletion in the Southern Ocean, Global Biogeochemical Cycles, 17, 3, 1081, (2003)  doi: 10.1029/2002GB001973   (pdf)

Casciotti, K. L., D. M. Sigman, and B. B. Ward, Linking diversity and stable isotope fractionation in ammonia-oxidizing bacteria, Geomicrobiology Journal, 20, 335–353, (2003)  doi:10.1080/01490450390241035  (pdf)

Sigman, D. M., R. Robinson, A. N. Knapp, A. van Geen, D. C. McCorkle, J. A. Brandes, and R. C. Thunell, Distinguishing between water column and sedimentary denitrification in the Santa Barbara Basin using the stable isotopes of nitrate, Geochemistry, Geophysics, Geosystems, 4, 5, 1040, (2003) doi:10.1029/2002GC000384  (pdf)

Karsh, K. L., T. W. Trull, M. J. Lourey, and D. M. Sigman, Relationship of nitrogen isotope fractionation to phytoplankton size and iron availability during the SOIREE Southern Ocean Iron RElease Experiment (SOIREE), Limnology and Oceanography, 48, 105-106, (2003)  (pdf)

Haug, G. H., D. Günther, L. C. Peterson, D. M. Sigman, and K. A. Hughen, B. Aeschlimann, Climate and the collapse of Maya civilization, Science, 299, 1731-1735, (2003) doi:10.1126/science.1080444   (pdf)

2002

Carillo, J. H., M. G. Hastings, D. M. Sigman, and B. J. Huebert, Atmospheric deposition of inorganic and organic nitrogen and base cations in Hawaii, Global Biogeochemical Cycles, 16, 4, 1076, (2002) doi:10.1029/2002GB001892   (pdf)

Pantoja, S., D. J. Repeta, J. P. Sachs, and D. M. Sigman, Stable isotope constraints on the nitrogen cycle of the Mediterranean Sea water column, Deep-Sea Research I, 49, 1609 –1621, (2002)  doi:10.1016/S0967-0637(02)00066-3 (pdf)

Casciotti, K. L., D. M. Sigman, M. Galanter Hastings, J. K. Bohlke, and A. Hilkert, Measurement of the oxygen isotopic composition of nitrate in seawater and freshwater using the denitrifier method, Analytical Chemistry, 74, 19, 4905-4912, (2002)  doi:10.1021/ac020113w   (pdf)

Tortell, P. D., G. R. DiTullio, D. M. Sigman, and F. M. M. Morel, CO2 effects on taxonomic composition and nutrient utilization in an Equatorial Pacific phytoplankton assemblage, Marine Ecology Progress Series, 236, 37-43, (2002)  (pdf)

Brzezinski, M. A., C. J. Pride, V. M. Franck, D. M. Sigman, J. L. Sarmiento, K. Matsumoto, N. Gruber, G. H. Rau, and K. H. Coale, A switch from Si(OH)4 to NO3- depletion in the glacial Southern Ocean, Geophysical Research Letters, 29, 12, (2002)  doi:10.1029/2001GL014349

Karl, D., A. Michaels, B. Bergman, D. Capone, E. Carpenter, R. Letelier, F. Lipschultz, H. Paerl, D. M. Sigman, and L. Stal, Dinitrogen fixation in the world’s oceans, Biogeochemistry, 57/58, 47–98, (2002) (pdf)

2001

Haug, G. H., K. A. Hughen, D. M. Sigman, L. C. Peterson, and U. Rohl, Southward migration of the Intertropical Convergence Zone through the Holocene, Science, 293, 1304-1308, (2001) doi:10.1126/science.1059725 

Sigman, D. M., and K. L. Casciotti, Nitrogen isotopes in the ocean, in Encyclopedia of Ocean Sciences, edited by J.H. Steele, K.K. Turekian, and S.A. Thorpe, pp. 2449, Academic Press, London, 2001.

Sigman, D. M., K. L. Casciotti, M. Andreani, C. Barford, M. Galanter, and J. K. Bohlke, A bacterial method for the nitrogen isotopic analysis of nitrate in seawater and freshwater, Analytical Chemistry, 73, 17, 4145-4153, (2001)  (pdf)

Sigman, D. M., and E. A. Boyle (2001), Palaeoceanography - Antarctic stratification and glacial CO2 - Sigman and Boyle reply, Nature, 412, 606-606. (2001)  doi:10.1038/35088132

2000

Sigman, D. M., Boyle, E. A., Glacial/interglacial variations in atmospheric carbon dioxide. Nature, 407, 6806, 859-869, (2000)  doi:10.1038/35038000

Sigman, D. M., M. A. Altabet, D. C. McCorkle, R. Francois, G. Fischer. The d15N of nitrate in the Southern Ocean: Nitrogen cycling and circulation in the ocean interior. Journal of Geophysical Research-Oceans, 105, C8, 19599-19614, (2000) doi:10.1029/2000JC000265

1999

Pride, C., R. Thunell, D. Sigman, L. Keigwin, M. Altabet, and E. Tappa, Nitrogen isotopic variations in the Gulf of California since the last deglaciation: Response to global climate change, Paleoceanography, 14(3), 397-409, (1999) doi:10.1029/1999PA900004

Haug, G. H., D. M. Sigman, R. Tiedemann, T.F. Pedersen, M. Sarnthein, Onset of permanent stratification in the subarctic Pacific Ocean, Nature, 401, 779-782, (1999) doi: 10.1038/44550

Altabet, M. A., C. Pilskaln, R. Thunell, C. Pride, D. Sigman, F. Chavez, and R. Francois, The Nitrogen isotope biogeochemistry of sinking particles from the margin of the eastern North Pacific. Deep-Sea Research, Part I, 46: 655-679 (1999) (pdf)

Sigman, D. M., M. A. Altabet, D. C. McCorkle, R. Francois, G. Fischer. The d15N of nitrate in the Southern Ocean: Nitrate consumption in surface waters. Global Biogeochemical Cycles, 13, 4, 1149-1166, (1999) doi:10.1029/1999GB900038

Sigman, D. M., M. A. Altabet, R. Francois, D. C. McCorkle, and J. F. Gaillard, The isotopic composition of diatom-bound nitrogen in Southern Ocean sediments, Paleoceanography, 14, 118-134, (1999) doi:10.1029/1998PA900018

1998

Holmes, R. M., J. W. McClelland, D. M. Sigman, B. Fry, and B. J. Peterson, Measuring 15N-NH4+ in marine, estuarine and fresh waters: An adaptation of the ammonia diffusion method for samples with low ammonium concentrations, Marine Chemistry, 60, 235-243, (1998) (pdf)

Haug, G. H., T. F. Pedersen, D. M. Sigman, S. E. Calvert, B. Nielsen, and L. C. Peterson, Glacial/interglacial variations in production and nitrogen fixation in the Cariaco Basin during the last 580 kyr, Paleoceanography, 13, 427-432, (1998)  doi:10.1029/98PA01976

Sigman, D. M., D. C. McCorkle, and W. R. Martin, The calcite lysocline as a constraint on glacial/interglacial low-latitude production changes, Global Biogeochemical Cycles, 12, 409-427, (1998) doi:10.1029/98GB01184

Hughen, K. A., J. T. Overpeck, S. J. Lehman, M. Kashgarian, J. Southon, L. C. Peterson, R. Alley, and D. M. Sigman, Deglacial changes in ocean circulation from an extended radiocarbon calibration, Nature, 391, 65-68, (1998)  doi:10.1038/34150

1997

Webb, R. S., D. H. Rind, S. J. Lehman, R. J. Healy, and D. M. Sigman, Influence of ocean heat transport on the climate of the Last Glacial Maximum, Nature, 385, 695-699, (1997) doi:10.1038/385695a0

Francois, R., M. A. Altabet, E. F. Yu, D. M. Sigman, M. P. Bacon, M. Frank, G. Bohrmann, G. Bareille, and L. D. Labeyrie, Contribution of Southern Ocean surface-water stratification to low atmospheric CO2 concentrations during the last glacial period, Nature, 389, 929-935, (1997) doi:10.1038/40073

Sigman, D. M., M. A. Altabet, R. Michener, D. C. McCorkle, B. Fry, and R. M. Holmes, Natural abundance-level measurement of the nitrogen isotopic composition of oceanic nitrate: an adaptation of the ammonia diffusion method, Marine Chemistry, 57, 227-242, (1997) (pdf)