Aquatic Sciences Meeting, Albuquerque 2001

SS02 Photochemical Reactions In Surface Waters: A Major Issue in the 21st Century? (Environmental Connections)

Date: Thursday, February 15, 2001, Time: 12:15:00 PM

Location: San Miguel

Wang, W, , Department of Marine Chemistry and Geochemistry, Woods Hole Ocean Inst., Woods Hole, MA 02543, USA, wwang@whoi.edu

Andrews, S, S, Department of Chemistry, Stanford University, Stanford, CA, 94305, USA, sandrews@Stanford.edu

Zafiriou, O, C, Department of Marine Chemistry and Geochemistry, Woods Hole Ocean. Inst. , Woods Hole, MA 02543, USA, ozafiriou@whoi.edu

THE MARINE CARBON MONOXIDE BUDGET: GLOBAL BLUE-WATER PHOTOPRODUCTION OF ~40Tg CO-C/YEAR BASED ON CONCORDANT SOURCE AND SINK ESTIMATES IN THE N. and S. PACIFIC

Published estimates of the marine carbon monoxide (CO) budget - or components of it - range over nearly two orders of magnitude. We have independently estimated CO photo-production, and microbial/gas exchange sinks. Production was estimated using apparent quantum yields measured in the N and S Pacific on RITS94, using simple optical and insolation approximations. The microbial sink was estimated using incubations on RITS94 and ACE-1 cruises, and extrapolated to the mixed-layer's active volume using the Levitus database and approximations about [CO] depth profiles. The gas exchange flux is from Bates et al., JGR 100, 23093-23101, (1995). These Pacific-based estimates agree within likely errors, which will be discussed. They will then be extrapolated globally to a blue water budget (depth>200m, 60N-60S). An upper-limit estimate of terrestrial DOC-driven CO photoproduction will be made. That plus the blue-water term gives an upper-limit estimate of <100 Tg CO-C per year from these sources. These numbers will be compared with (generally larger) literature values.

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Aquatic Sciences Meeting, Albuquerque 2001

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