Bistable effect of organic enrichment on sea spray radiative properties
Jennings, S. Gerard
O'Dowd, Colin D.
MetadataShow full item record
This item's downloads: 0 (view details)
Cited 15 times in Scopus (view citations)
Vaishya, Aditya; Ovadnevaite, Jurgita; Bialek, Jakub; Jennings, S. Gerard; Ceburnis, Darius; O'Dowd, Colin D. (2013). Bistable effect of organic enrichment on sea spray radiative properties. Geophysical Research Letters 40 (24), 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.