Using eddy covariance to estimate air-sea gas transfer velocity for oxygen
2016 (English)In: Journal of Marine Systems, ISSN 0924-7963, E-ISSN 1879-1573, Vol. 159, 67-75 p.Article in journal (Refereed) Published
Air-sea gas transfer velocity for O-2 is calculated using directly measured fluxes with the eddy covariance technique. It is a direct method and is frequently used to determine fluxes of heat, humidity, and CO2, but has not previously been used to estimate transfer velocities for O-2, using atmospheric eddy covariance data. The measured O-2 fluxes are upward directed, in agreement with the measured air-sea gradient of the O-2 concentration, and opposite to the direction of the simultaneously measured CO2 fluxes. The transfer velocities estimated from measurements are compared with prominent wind speed parameterizations of the transfer velocity for CO2 and O-2, previously established from various measurement techniques. Our result indicates stronger wind speed dependence for the transfer velocity of O-2 compared to CO2 starting at intermediate wind speeds. This stronger wind speed dependence appears to coincide with the onset of whitecap formation in the flux footprint and the strong curvature of a cubic wind -dependent function for the transfer velocity provides the best fit to the data. Additional data using the measured O-2 flux and an indirect method (based on the Photosynthetic Quotient) to estimate oxygen concentration in water, support the stronger wind dependence for the transfer velocity of O-2 O-2 to CO2.
Place, publisher, year, edition, pages
2016. Vol. 159, 67-75 p.
Meteorology and Atmospheric Sciences
Research subject Meteorology
IdentifiersURN: urn:nbn:se:uu:diva-287887DOI: 10.1016/j.jmarsys.2016.02.008ISI: 000375506200006OAI: oai:DiVA.org:uu-287887DiVA: diva2:923556