Wind Speed and Sea State Dependencies of Air‐Sea Gas Transfer: Results From the High Wind Speed Gas Exchange Study (HiWinGS)

Blomquist, B. W.; Brumer, S. E.; Fairall, C. W.; Huebert, B. J.; Zappa, C. J.; Brooks, I. M.; Yang, M.; Bariteau, L.; Prytherch, J.; Hare, J. E.; Czerski, H.; Matei, A.; Pascal, R. W.

doi:10.1002/2017JC013181

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Wind Speed and Sea State Dependencies of Air‐Sea Gas Transfer: Results From the High Wind Speed Gas Exchange Study (HiWinGS)

2017
By Blomquist, B. W. ; Brumer, S. E. ; Fairall, C. W. ; ...
Source: JGR Oceans 122(10): 8034-8062, 2017

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Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Blomquist, B. W. ; Brumer, S. E. ; Fairall, C. W. ; Huebert, B. J. ; Zappa, C. J. ; ... More +

Blomquist, B. W. ; Brumer, S. E. ; Fairall, C. W. ; Huebert, B. J. ; Zappa, C. J. ; Brooks, I. M. ; Yang, M. ; Bariteau, L. ; Prytherch, J. ; Hare, J. E. ; Czerski, H. ; Matei, A. ; Pascal, R. W. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; PSL (Physical Sciences Laboratory) ; CPO (Climate Program Office) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; ... More +

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; PSL (Physical Sciences Laboratory) ; CPO (Climate Program Office) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; JIMAR (Joint Institute for Marine and Atmospheric Research) Less -
Description:

A variety of physical mechanisms are jointly responsible for facilitating air‐sea gas transfer through turbulent processes at the atmosphere‐ocean interface. The nature and relative importance of these mechanisms evolves with increasing wind speed. Theoretical and modeling approaches are advancing, but the limited quantity of observational data at high wind speeds hinders the assessment of these efforts. The HiWinGS project successfully measured gas transfer coefficients (k660) with coincident wave statistics under conditions with hourly mean wind speeds up to 24 m s−1 and significant wave heights to 8 m. Measurements of k660 for carbon dioxide (CO2) and dimethylsulfide (DMS) show an increasing trend with respect to 10 m neutral wind speed (U10N), following a power law relationship of the form: urn:x-wiley:21699275:media:jgrc22494:jgrc22494-math-0001 and urn:x-wiley:21699275:media:jgrc22494:jgrc22494-math-0002. Among seven high wind speed events, CO2 transfer responded to the intensity of wave breaking, which depended on both wind speed and sea state in a complex manner, with urn:x-wiley:21699275:media:jgrc22494:jgrc22494-math-2001 increasing as the wind sea approaches full development. A similar response is not observed for DMS. These results confirm the importance of breaking waves and bubble injection mechanisms in facilitating CO2 transfer. A modified version of the Coupled Ocean‐Atmosphere Response Experiment Gas transfer algorithm (COAREG ver. 3.5), incorporating a sea state‐dependent calculation of bubble‐mediated transfer, successfully reproduces the mean trend in observed k660 with wind speed for both gases. Significant suppression of gas transfer by large waves was not observed during HiWinGS, in contrast to results from two prior field programs.
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Atmospheric Chemistry Ocean-atmosphere Interaction Winds
Source:

JGR Oceans 122(10): 8034-8062, 2017
DOI:

https://doi.org/10.1002/2017JC013181
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Journal Article
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CC BY
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urn:sha256:81b482f3339438765c9102fc8159f8a186f9c0b4f8859063aecb0e3f5be1da4c
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Wind Speed and Sea State Dependencies of Air‐Sea Gas Transfer: Results From the High Wind Speed Gas Exchange Study (HiWinGS)

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