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Title: Influence of wind speed averaging on estimates of dimethylsulfide emission fluxes

Abstract

The effect of various wind-speed-averaging periods on calculated DMS emission fluxes is quantitatively assessed. Here, a global climate model and an emission flux module were run in stand-alone mode for a full year. Twenty-minute instantaneous surface wind speeds and related variables generated by the climate model were archived, and corresponding 1-hour-, 6-hour-, daily-, and monthly-averaged quantities calculated. These various time-averaged, model-derived quantities were used as inputs in the emission flux module, and DMS emissions were calculated using two expressions for the mass transfer velocity commonly used in atmospheric models. Results indicate that the time period selected for averaging wind speeds can affect the magnitude of calculated DMS emission fluxes. A number of individual marine cells within the global grid show DMS emissions fluxes that are 10-60% higher when emissions are calculated using 20-minute instantaneous model time step winds rather than monthly-averaged wind speeds, and at some locations the differences exceed 200%. Many of these cells are located in the southern hemisphere where anthropogenic sulfur emissions are low and changes in oceanic DMS emissions may significantly affect calculated aerosol concentrations and aerosol radiative forcing.

Authors:
 [1];  [1];  [1];  [1];  [1]
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  1. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15003526
Report Number(s):
PNWD-SA-5594
Journal ID: ISSN 0148-0227
Grant/Contract Number:  
AC06-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research
Additional Journal Information:
Journal Volume: 107; Journal Issue: D23; Journal ID: ISSN 0148-0227
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; dimethysulfide; air-sea gas exchange; surface fluxes; marine boundary layer; climate change; Monin-Obukhov similarity theory

Citation Formats

Chapman, E. G., Shaw, W. J., Easter, R. C., Bian, X., and Ghan, S. J. Influence of wind speed averaging on estimates of dimethylsulfide emission fluxes. United States: N. p., 2002. Web. doi:10.1029/2001JD001564.
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Chapman, E. G., Shaw, W. J., Easter, R. C., Bian, X., & Ghan, S. J. Influence of wind speed averaging on estimates of dimethylsulfide emission fluxes. United States. https://doi.org/10.1029/2001JD001564
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Chapman, E. G., Shaw, W. J., Easter, R. C., Bian, X., and Ghan, S. J. Tue . "Influence of wind speed averaging on estimates of dimethylsulfide emission fluxes". United States. https://doi.org/10.1029/2001JD001564. https://www.osti.gov/servlets/purl/15003526.
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@article{osti_15003526,
title = {Influence of wind speed averaging on estimates of dimethylsulfide emission fluxes},
author = {Chapman, E. G. and Shaw, W. J. and Easter, R. C. and Bian, X. and Ghan, S. J.},
abstractNote = {The effect of various wind-speed-averaging periods on calculated DMS emission fluxes is quantitatively assessed. Here, a global climate model and an emission flux module were run in stand-alone mode for a full year. Twenty-minute instantaneous surface wind speeds and related variables generated by the climate model were archived, and corresponding 1-hour-, 6-hour-, daily-, and monthly-averaged quantities calculated. These various time-averaged, model-derived quantities were used as inputs in the emission flux module, and DMS emissions were calculated using two expressions for the mass transfer velocity commonly used in atmospheric models. Results indicate that the time period selected for averaging wind speeds can affect the magnitude of calculated DMS emission fluxes. A number of individual marine cells within the global grid show DMS emissions fluxes that are 10-60% higher when emissions are calculated using 20-minute instantaneous model time step winds rather than monthly-averaged wind speeds, and at some locations the differences exceed 200%. Many of these cells are located in the southern hemisphere where anthropogenic sulfur emissions are low and changes in oceanic DMS emissions may significantly affect calculated aerosol concentrations and aerosol radiative forcing.},
doi = {10.1029/2001JD001564},
journal = {Journal of Geophysical Research},
number = D23,
volume = 107,
place = {United States},
year = {Tue Dec 03 00:00:00 EST 2002},
month = {Tue Dec 03 00:00:00 EST 2002}
}
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https://doi.org/10.1029/2001JD001564
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