Details for Wind Speed Influences on Marine Aerosol Optical Depth

Name:Wind Speed Influences on Marine Aerosol Optical Depth

O’Dowd, C., C. Scannell, J. Mulcahy & S. G. Jennings,   Wind Speed Influences on Marine Aerosol Optical Depth. Adv. in Meteorol., Article ID 830846,  2010. doi:10.1155/2010/830846, 2010.

TheMulcahy (Mulcahy et al., 2008) power-law parameterization, derived at the coastal Atlantic stationMace Head, between clean marine aerosol optical depth (AOD) and wind speed is compared to open ocean MODIS-derived AOD versus wind speed. The reported AOD versus wind speed (U) was a function of 

U2. The open ocean MODIS-derived AOD at 550nm and 860nm wavelengths, while in good agreement with the general magnitude of the Mulcahy parameterization, follows a power-law with the exponent ranging from 0.72 to 2.47 for a wind speed range of 2–18ms1. For the four cases examined, some MODIS cases underestimated AOD while other cases overestimated AOD relative to the Mulcahy scheme. Overall, the results from MODIS support the general power-law relationship of Mulcahy, although some linear cases were also encountered in the MODIS dataset. Deviations also arise between MODIS andMulcahy at higher wind speeds (>15ms1), whereMODIS-derived AOD returns lower values as compared to Mulcahy. The results also support the suggestion than wind generated sea spray, under moderately high winds, can rival anthropogenic pollution plumes advecting out into marine environments with wind driven AOD contributing to AOD values approaching 0.3.
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