Parameterization of oceanic whitecap fraction based on satellite observations

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http://hdl.handle.net/10138/183645

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Albert , M F M A , Anguelova , M D , Manders , A M M , Schaap , M & De Leeuw , G 2016 , ' Parameterization of oceanic whitecap fraction based on satellite observations ' , Atmospheric Chemistry and Physics , vol. 16 , no. 21 , pp. 13725-13751 . https://doi.org/10.5194/acp-16-13725-2016

Title: Parameterization of oceanic whitecap fraction based on satellite observations
Author: Albert, Monique F. M. A.; Anguelova, Magdalena D.; Manders, Astrid M. M.; Schaap, Martijn; De Leeuw, Gerrit
Contributor: University of Helsinki, Department of Physics
Date: 2016-11-07
Language: eng
Number of pages: 27
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/183645
Abstract: In this study, the utility of satellite-based white-cap fraction (W) data for the prediction of sea spray aerosol (SSA) emission rates is explored. More specifically, the study aims at evaluating how an account for natural variability of whitecaps in the W parameterization would affect SSA mass flux predictions when using a sea spray source function (SSSF) based on the discrete whitecap method. The starting point is a data set containing W data for 2006 together with matching wind speed U-10 and sea surface temperature (SST) T. Whitecap fraction W was estimated from observations of the ocean surface brightness temperature T-B by satellite-borne radiometers at two frequencies (10 and 37 GHz). A global-scale assessment of the data set yielded approximately quadratic correlation between W and U-10. A new global W(U-10) parameterization was developed and used to evaluate an intrinsic correlation between W and U-10 that could have been introduced while estimating W from T B. A regional-scale analysis over different seasons indicated significant differences of the coefficients of regional W(U-10) relationships. The effect of SST on W is explicitly accounted for in a new W(U-10, T) parameterization. The analysis of W values obtained with the new W(U-10) and W(U-10, T) parameterizations indicates that the influence of secondary factors on W is for the largest part embedded in the exponent of the wind speed dependence. In addition, the W(U-10, T) parameterization is able to partially model the spread (or variability) of the satellite-based W data. The satellite-based parameterization W(U-10, T) was applied in an SSSF to estimate the global SSA emission rate. The thus obtained SSA production rate for 2006 of 4.4 x 10(12) kg year(-1) is within previously reported estimates, however with distinctly different spatial distribution.
Subject: SEA-SALT AEROSOL
CLOUD CONDENSATION NUCLEI
REMOTE MARINE ATMOSPHERE
ENCAPSULATING WAVE STATE
IN-SITU
MICROWAVE EMISSIVITY
GLOBAL DISTRIBUTION
WATER TEMPERATURE
OZONE OXIDATION
BOUNDARY-LAYER
114 Physical sciences
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