Computer Science
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..74...13m&link_type=abstract
Earth and Planetary Science Letters, Volume 74, Issue 1, p. 13-26.
Computer Science
26
Scientific paper
We present centimeter-scale porewater δ13C profiles from four sites in the Central Equatorial Pacific Ocean, which reveal steep porewater δ13C gradients (up to -1.0‰ cm-1) at the deep-sea sediment-water interface. We describe the processes controlling porewater carbon isotopic composition and incorporate them into a model of the deep-sea benthic carbon cycle. Our measured δ13C profiles are then used to estimate carbon rain rates at two of these sites, MANOP sites C and S. The δ13C data yield organic carbon rain rates of 10 μmol C cm-2 yr-1 at site C and 3 μmol C cm-2 yr-1 at site S. These carbon rain rates agree with recent carbon rain estimates based on sediment trap data and porewater nitrate profiles, but are a factor of 2 lower than estimates based on millimeter-scale porewater oxygen profiles. Our model results indicate that changes of the same magnitude in organic carbon rain rate and bottom water composition (O2, ΣCO2, and δ13C) have comparable effects on the carbon isotopic composition of surficial porewaters. This suggests the need to consider the effects of benthic carbon cycling on the stable carbon isotope record preserved in deep-sea benthic foraminifera tests.
Emerson Steven R.
McCorkle Daniel C.
Quay Paul D.
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