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The Intensifying Role of High Wind Speeds on Air‐Sea Carbon Dioxide Exchange

Abstract : While it has been known that wave breaking and bubble generation at high wind speeds enhance air-sea carbon dioxide (CO2) exchange rates (F), quantification of their contribution at the global scale remains a formidable challenge. There is urgency to make progress on this issue as a significant uptick in both magnitude and frequency of high wind events (HW) has been documented over the last 3 decades. Using a wind-wave dependent expression for gas transfer velocity (k) that explicitly considers bubbles and a widely used wind-only parameterization, the spatial pattern of k at high winds can be explained by sea surface temperature distribution. The HW, which represent some 3% of wind conditions, contribute disproportionally to the global F (18%) with an increasing trend. Approximately 50% of the global F at high winds is attributed to bubble contribution. The findings are of significance to quantifying CO2 transfer to the ocean interior.
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https://hal.univ-brest.fr/hal-03212277
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Submitted on : Thursday, April 29, 2021 - 2:44:10 PM
Last modification on : Wednesday, October 20, 2021 - 12:09:03 AM

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Yuanyuan Gu, Gabriel Katul, Nicolas Cassar. The Intensifying Role of High Wind Speeds on Air‐Sea Carbon Dioxide Exchange. Geophysical Research Letters, American Geophysical Union, 2021, 48 (5), ⟨10.1029/2020GL090713⟩. ⟨hal-03212277⟩

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