Coupled nitrogen and oxygen isotope measurements of nitrate along the eastern North Pacific margin

Global Biogeochemical Cycles - Tập 19 Số 4 - 2005
Daniel M. Sigman1, Julie Granger2, Peter J. DiFiore1, Moritz F. Lehmann3, Ruby Ho1, Greg Cane1, Alexander van Geen4
1Department of Geosciences, Princeton University, Princeton New Jersey, USA
2Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, British Columbia, Canada
3Geochemistry and Geodynamics Research Center (GEOTOP-UQAM-McGill), University of Quebec at Montreal, Montreal, Quebec, Canada
4Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA

Tóm tắt

Water column depth profiles along the North Pacific margin from Point Conception to the tip of Baja California indicate elevation of nitrate (NO3−) 15N/14N and 18O/16O associated with denitrification in the oxygen‐deficient thermocline waters of the eastern tropical North Pacific. The increase in δ18O is up to 3‰ greater than in δ15N, whereas our experiments with denitrifier cultures in seawater medium indicate a 1:1 increase in NO3− δ18O and δ15N during NO3− consumption. Moreover, the maximum in NO3− δ18O is somewhat shallower than the maximum in NO3− δ15N. These two observations can be summarized as an “anomaly” from the 1:1 δ18O‐to‐δ15N relationship expected from culture results. Comparison among stations and with other data indicates that this anomaly is generated locally. The anomaly has two plausible interpretations: (1) the addition of low‐δ15N NO3− to the shallow thermocline by the remineralization of newly fixed nitrogen, or (2) active cycling between NO3− and NO2− (coupled NO3− reduction and NO2− oxidation) in the suboxic zone.

Từ khóa


Tài liệu tham khảo

10.1016/S0967-0645(01)00088-1

10.1038/354136a0

10.1016/S0967-0637(98)00084-3

10.1021/ja01484a013

10.1016/0198-0149(82)90089-9

10.1016/0198-0149(82)90031-0

10.1073/pnas.79.19.5871

10.1128/AEM.65.3.989-994.1999

10.1029/JC095iC12p22243

10.1016/S0009-2541(96)00124-6

10.1002/rcm.1123

10.1016/0022-1694(90)90068-9

10.1016/S0016-7037(97)00041-0

10.1029/2001GB001856

10.4319/lo.1998.43.7.1680

Broecker W. S., 1982, Tracers in the Sea

10.1016/S0021-9258(18)32100-8

10.1039/jr9520004913

10.1016/S0967-0637(96)00091-X

Casciotti K. L.(2002) Molecular and stable isotopic characterization of enzymes involved in nitrification and nitrifier‐denitrification Ph.D. Princeton Univ. Princeton N. J.

10.1021/ac020113w

10.1080/01490450390219887

10.1016/0304-4203(75)90009-2

10.4319/lo.1972.17.6.0885

10.1126/science.233.4769.1200

10.3989/scimar.2001.65s285

Conkright M. E. R. A.Locarnini H. E.Garcia T. D.O'Brien T. P.Boyer C.Stephens andJ. I.Antonov(2002) World Ocean Atlas 2001: Objective analyses data statistics and figures CD‐ROM documentation report 17 pp. Natl. Oceanogr. Data Cent. Silver Spring Md.

10.1086/337037

10.1029/2000GB001291

10.1029/2003GB002189

Dispirito A. A., 1986, Oxygen‐exchange between nitrate molecules during nitrite oxidation by nitrobacter, J. Biol. Chem., 261, 10,534, 10.1016/S0021-9258(18)67417-4

10.1038/372765a0

Fritz P., 1989, Oxygen isotope exchange between sulphate and water during bacterial reduction of sulphate, Chem. Geol., 79, 99

10.1016/S0198-0149(10)80021-4

Gonfiantini R. W.Stichler andK.Rosanski(1995) Standards and intercomparison materials distributed by the IAEA for stable isotope measurements report Int. At. Energy Agency Vienna.

Granger J., 2004, Nitrogen and oxygen isotope effects associated with nitrate assimilation and denitrification by laboratory cultures of marine plankton, Eos Trans. AGU, 85

10.4319/lo.2004.49.5.1763

10.1029/97GB00077

10.1016/j.marchem.2003.08.004

10.1021/ja01487a031

10.1023/A:1015798105851

10.1016/B978-0-444-81546-0.50023-9

10.1029/1999PA000407

10.1029/2004GB002320

10.1016/0014-5793(83)80484-0

10.1016/S0016-7037(03)00085-1

10.1016/j.marchem.2004.02.001

10.1029/2005GB002508

10.1016/0198-0149(88)90129-X

10.1016/0198-0149(90)90060-9

10.4319/lo.1989.34.5.0820

10.1016/0304-4203(96)00034-5

10.1029/2002GB001973

10.1007/BF02374138

10.1111/j.1745-6584.1999.tb01124.x

10.1007/BF02179827

10.1029/96GB02562

10.1111/j.1529-8817.2004.03172.x

10.1016/S1465-9972(00)00031-3

10.1016/S0967-0637(02)00066-3

Redfield A. C., 1958, The biological control of chemical factors in the environment, Am. Sci., 46, 205

10.1021/ac9610523

10.1126/science.195.4275.260

10.1023/A:1023362923881

10.1099/00221287-137-5-1179

10.1006/rwos.2001.0172

10.1029/2000JC000265

10.1021/ac010088e

10.1029/2002PA000818

10.1029/2002GC000384

10.1016/S0022-1694(99)00205-X

10.1126/science.221.4611.669

10.1029/2003GB002185

10.1038/22941

van Geen A. E. A.(2001) Baja California coring cruise OXMZ01MV: R/V Melville October 29 – November 22 1999 Tech. Rep. LDEO 2001‐01 300 pp. Lamont‐Doherty Earth Obs. Palisades N. Y.

10.1029/2003PA000911

10.3354/meps158011

10.1016/S0967-0637(00)00110-2

10.1016/0198-0149(87)90039-2

10.3354/meps169029

10.1016/0883-2927(95)00013-A

Wooster W. S., 1970, California Undercurrent off northern Baja California, J. Mar. Res., 28, 235

Thông tin
Thông tin xuất bản

Global Biogeochemical Cycles

Tập 19 Số 4

Thông tin tác giả