Mathematics – Logic
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3608605s&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 8, CiteID L08605
Mathematics
Logic
5
Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Nutrients And Nutrient Cycling (0470, 1050), Oceanography: Biological And Chemical: Stable Isotopes (0454, 1041), Geochemistry: Stable Isotope Geochemistry (0454, 4870), Oceanography: Biological And Chemical: Chemical Tracers
Scientific paper
Culture studies of denitrifying bacteria predict that denitrification will generate equivalent gradients in the δ 15N and δ 18O of deep ocean nitrate. A depth profile of nitrate isotopes from the Hawaii Ocean Time-series Station ALOHA shows less of an increase in δ 18O than in δ 15N as one ascends from abyssal waters into the denitrification-impacted mid-depth waters. A box model of the ocean nitrate N and O isotopes indicates that this is the effect of the low latitude nitrate assimilation/regeneration cycle: organic N sinking out of the surface spreads the high-δ 15N signal of pelagic denitrification into waters well below and beyond the suboxic zone, whereas the nitrate δ 18O signal of denitrification can only be transmitted by circulation in the interior.
Deutsch Curtis
DiFiore Peter J.
Hain Mathis P.
Karl David M.
Sigman Daniel M.
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