Aquatic Sciences Meeting, Albuquerque 2001

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

Date: Friday, February 16, 2001, Time: 10:00:00 AM

Location: San Miguel

Xie, H, , Woods Hole Oceanographic Institution, Woods Hole, USA, hxie@whoi.edu

Zafiriou, O, C, Woods Hole Oceanographic Institution, Woods Hole, USA, ozafiriou@whoi.edu

Wang, W, , Woods Hole Oceanographic Institution, Woods Hole, USA, wwang@whoi.edu

Taylor, C, D, Woods Hole Oceanographic Institution, Woods Hole, USA, ctaylor@whoi.edu

PRODUCTION AND CONSUMPTION OF CARBON MONOXIDE IN THE SARGASSO SEA SURFACE WATER IN AUGUST 1999

Depth profiles of CO were collected at a Lagrangian time-series station near the BATS site in August 1999. Diurnal variation of CO concentration penetrated down to 60 m, a depth well below the surface mixed layer, suggesting photoproduction of this species at depths deeper than previously thought. The column burden of CO in the upper 50 m of the water column averaged 33.6 mmol m^-2, and exhibited an up to 3.4 fold variation in magnitude over the diurnal cycle. The rates of net production, total production, and biological consumption were estimated from the observed diurnal cycle of CO column burden. Normalized to daily integrated insolation (285-2800 nm), the daily integrated net and total column production of CO were 1.33 +/- 0.17 and 2.61 +/- 0.43 mmol/Mj (mean +/- stdev, n = 7), respectively. The biological oxidation rate constant was estimated to be 1.45 +/- 0.19 d^-1 (mean +/- stdev, n = 6). These rates agreed reasonably well with the production and loss rates measured directly from in-situ incubations using an optical buoy developed for this purpose.

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Aquatic Sciences Meeting, Albuquerque 2001

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