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Vaishya, A,Ovadnevaite, J,Bialek, J,Jennings, SG,Ceburnis, D,O'Dowd, CD
2013
December
Geophysical Research Letters
Bistable effect of organic enrichment on sea spray radiative properties
Published
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Optional Fields
aerosol sea spray DIFFERENTIAL MOBILITY ANALYZER MARINE AEROSOL RELATIVE-HUMIDITY LIGHT-SCATTERING MACE HEAD QUANTIFICATION ISOPRENE MATTER CARBON TDMA
40
6395
6398
Primary-produced sea spray aerosol, typically comprising sea-salt, but also enriched with organic matter (OM) in biologically active oceanic regions, impacts the global radiative budget through contributions to aerosol optical depth. We show that sea spray light-scattering enhancement, f(RH), as a function of relative humidity (RH) is suppressed when enriched with OM. A new hygroscopic growth factor parameterization reveals a dual hygroscopicity state, flipping from high hygroscopicity and high f(RH) to low hygroscopicity and low f(RH) as the OM mixing volume percentage exceeds similar to 55% in sea spray. Under elevated wind speeds, this affects the Top-of-atmosphere direct radiative forcing (F) by reducing the cooling contribution of sea spray by similar to 5.5 times compared to pure sea-salt spray. These results suggest a positive feedback coupling between the marine biosphere, sea spray aerosol, and the direct radiative budget.
DOI 10.1002/2013GL058452
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