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

被引:292
|
作者
Sigman, DM [1 ]
Granger, J
DiFiore, PJ
Lehmann, MM
Ho, R
Cane, G
van Geen, A
机构
[1] Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA
[2] Univ British Columbia, Dept Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada
[3] Univ Quebec, GEOTOP UQAM McGill, Geochem & Geodynam Res Ctr, Montreal, PQ H3C 3P8, Canada
[4] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA
关键词
D O I
10.1029/2005GB002458
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
[1] Water column depth profiles along the North Pacific margin from Point Conception to the tip of Baja California indicate elevation of nitrate (NO3-) N-15/N-14 and O-18/O-16 associated with denitrification in the oxygen-deficient thermocline waters of the eastern tropical North Pacific. The increase in delta O-18 is up to 3 parts per thousand greater than in delta N-15, whereas our experiments with denitrifier cultures in seawater medium indicate a 1: 1 increase in NO3- delta O-18 and delta N-15 during NO3- consumption. Moreover, the maximum in NO3- delta O-18 is somewhat shallower than the maximum in NO3- delta N-15. These two observations can be summarized as an "anomaly'' from the 1: 1 delta O-18- to- delta N-15 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-delta(15) N 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.
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页数:14
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