Abstract
Although the air-sea gas transfer velocity k is usually parameterized with wind speed, the so-called small-eddy model suggests a relationship between k and ocean surface dissipation of turbulent kinetic energy ϵ. Laboratory and field measurements of k and ϵ have shown that this model holds in various ecosystems. Here, field observations are presented supporting the theoretical model in the open ocean. These observations are based on measurements from the Air-Sea Interaction Profiler and eddy covariance CO2 and DMS air-sea flux data collected during the Knorr11 cruise. We show that the model results can be improved when applying a variable Schmidt number exponent compared to a commonly used constant value of 1/2. Scaling ϵ to the viscous sublayer allows us to investigate the model at different depths and to expand its applicability for more extensive data sets.
Highlights
IntroductionGas fluxes across the air-sea interface are computed according to: F = K s ∆P (1)
Gas fluxes across the air-sea interface are computed according to: F = K s ∆P (1)where ∆P is the partial pressure difference of the particular gas between the ocean and the atmosphere, s is the solubility of the gas, and K is the total gas transfer velocity [1, 2]
The water side air-sea gas transfer velocity k is usually parameterized as a function of wind speed (k = f (u10)) [4], as this is a readily available parameter from in-situ and satellite observations
Summary
Gas fluxes across the air-sea interface are computed according to: F = K s ∆P (1). Where ∆P is the partial pressure difference of the particular gas between the ocean and the atmosphere, s is the solubility of the gas, and K is the total gas transfer velocity [1, 2]. The water side air-sea gas transfer velocity k is usually parameterized as a function of wind speed (k = f (u10)) [4], as this is a readily available parameter from in-situ and satellite observations. Wind speed is not the only factor influencing k. As the physical processes that influence k are mostly controlled by the near-surface dissipation rate of turbulent kinetic
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