Air-sea gas transfer velocity for oxygen derived from float data.

Kihm, Christoph and Körtzinger, Arne (2010) Air-sea gas transfer velocity for oxygen derived from float data. Open Access Journal of Geophysical Research: Oceans, 115 . C12003. DOI 10.1029/2009JC006077.

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Supplementary data:

Abstract

We estimated the air-sea gas transfer velocity for oxygen using three consecutive years (Sept. 2003 to Aug. 2006) of high-quality oxygen measurements from profiling floats in the central Labrador Sea. Mixed layer oxygen concentrations exhibit strong seasonality characterized by biologically and thermally driven evasion during spring/summer and invasion during fall/winter caused by cooling and ventilation of oxygen-deficient subsurface waters. Mixed layer oxygen budgets entirely excluding the spring bloom
period are employed to estimate the air-sea transfer velocity for oxygen. By using co-located wind speed data acquired by scatterometry from the QuikSCAT satellite, wind speed dependent parameterizations for the air-sea gas transfer velocity k660 (CO2 at 20◦C and salinity 35) are established and compared with prominent parameterizations from the literature. Quadratic, cubic and quartic functions are fitted to the data for short-term and long-term wind
speed averages separately. In both cases the quadratic functions yield the poorest fit to the observations. Overall, the stronger curvature of the cubic functions provides the best fit, while the quartic function also fits the data less well. Our results generally confirm the stronger wind speed dependencies among the suite of published parameterizations. Also the better fits found for cubic function points at the strong importance of very high wind speed for airsea gas exchange of O2.

Document Type: Article
Keywords: Marine chemistry; Air-sea gas transfer
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2009JC006077
ISSN: 2169-9275
Projects: Future Ocean
Date Deposited: 26 Nov 2010 13:02
Last Modified: 27 Feb 2018 10:19
URI: http://oceanrep.geomar.de/id/eprint/10176

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