Oxygen Utilization and Organic Carbon Remineralization in the Upper Water Column of the Pacific Ocean |
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| Authors: | Richard A Feely Christopher L Sabine Reiner Schlitzer John L Bullister Sabine Mecking Dana Greeley |
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| Institution: | (1) NOAA/Pacific Marine Environmental Laboratory, Sand Point Way N.E., Seattle, WA, 98115, U.S.A.;(2) Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, Bremerhaven, Germany;(3) Woods Hole Oceanographic Institution, Woods Hole, MA, 02543, U.S.A |
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| Abstract: | As a part of the JGOFS synthesis and modeling project, researchers have been working to synthesize the WOCE/JGOFS/DOE/NOAA
global CO2 survey data to better understand carbon cycling processes in the oceans. Working with international investigators we have
compiled a Pacific Ocean data set with over 35,000 unique samples analyzed for at least two carbon species, oxygen, nutrients,
chlorofluorocarbon (CFC) tracers, and hydrographic parameters. We use these data here to estimate in-situ oxygen utilization
rates (OUR) and organic carbon remineralization rates within the upper water column of the Pacific Ocean. OURs are derived
from the observed apparent oxygen utilization (AOU) and the water age estimates based on CFCs in the upper water and natural
radiocarbon in deep waters. The rates are generally highest just below the euphotic zone and decrease with depth to values
that are much lower and nearly constant in water deeper than 1200 m. OURs ranged from about 0.02–10 μmol kg−1yr−1 in the upper water masses from about 100–1000 m, and averaged = 0.10 μmol kg−1yr−1 in deep waters below 1200 m. The OUR data can be used to directly estimate organic carbon remineralization rates using the
C:O Redfield ratio given in Anderson and Sarmiento (1994). When these rates are integrated we obtain an estimate of 5.3 ±
1 Pg C yr−1 for the remineralization of organic carbon in the upper water column of the Pacific Ocean.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Oxygen utilization organic carbon remineralization chlorofluorocarbons |
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