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The influence of short-term wind variability on air-sea CO2 exchange

The influence of short-term wind variability on air-sea CO2 exchange
The influence of short-term wind variability on air-sea CO2 exchange
Quantifying the regional and global exchange of CO2 between the ocean and atmosphere requires knowledge of the factors that affect CO2 gas transfer (e.g., wind speed) and the air-sea difference in partial pressure of CO2 (pCO2). A major uncertainty is the effect of short-term variability on air-sea CO2 flux. Using high sampling frequency wind speed and pCO2 data collected during deployments of the autonomous CARbon Interface OCean Atmosphere (CARIOCA) buoy, we compare CO2 fluxes at different sampling frequency of wind speed (i.e., hourly versus daily averaged). Air-sea CO2 flux was up to three times greater if high frequency wind data was used rather than daily average values. This difference arises from the non-linear relationship between wind speed and CO2 gas transfer coefficient, and a better representation of wind distribution at a higher frequency (i.e., hourly) of sampling. This finding has significant implications for determining regional and global air-sea CO2 fluxes, and understanding of the global carbon cycle.
0094-8276
3281-3284
Bates, Nicholas R.
954a83d6-8424-49e9-8acd-e606221c9c57
Merlivat, Liliane
59f0a989-d3bf-4be0-91a6-237a8dde0c24
Bates, Nicholas R.
954a83d6-8424-49e9-8acd-e606221c9c57
Merlivat, Liliane
59f0a989-d3bf-4be0-91a6-237a8dde0c24

Bates, Nicholas R. and Merlivat, Liliane (2012) The influence of short-term wind variability on air-sea CO2 exchange. Geophysical Research Letters, 28 (17), 3281-3284. (doi:10.1029/2001GL012897).

Record type: Article

Abstract

Quantifying the regional and global exchange of CO2 between the ocean and atmosphere requires knowledge of the factors that affect CO2 gas transfer (e.g., wind speed) and the air-sea difference in partial pressure of CO2 (pCO2). A major uncertainty is the effect of short-term variability on air-sea CO2 flux. Using high sampling frequency wind speed and pCO2 data collected during deployments of the autonomous CARbon Interface OCean Atmosphere (CARIOCA) buoy, we compare CO2 fluxes at different sampling frequency of wind speed (i.e., hourly versus daily averaged). Air-sea CO2 flux was up to three times greater if high frequency wind data was used rather than daily average values. This difference arises from the non-linear relationship between wind speed and CO2 gas transfer coefficient, and a better representation of wind distribution at a higher frequency (i.e., hourly) of sampling. This finding has significant implications for determining regional and global air-sea CO2 fluxes, and understanding of the global carbon cycle.

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More information

Published date: 1 September 2012
Organisations: Ocean Biochemistry & Ecosystems

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Local EPrints ID: 358332
URI: https://eprints.soton.ac.uk/id/eprint/358332
ISSN: 0094-8276
PURE UUID: d2019b8c-4319-490a-bc14-81c0a8c5ffd7

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Date deposited: 03 Oct 2013 13:26
Last modified: 18 Jul 2017 03:30

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Author: Liliane Merlivat

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