Natural aerosols explain seasonal and spatial patterns of Southern Ocean cloud albedo. McCoy, D., T.; Burrows, S., M.; Wood, R.; Grosvenor, D., P.; Elliott, S., M.; Ma, P.; Rasch, P., J.; and Hartmann, D., L. Science Advances, 1(6):e1500157-e1500157, American Association for the Advancement of Science, 7, 2015.
Natural aerosols explain seasonal and spatial patterns of Southern Ocean cloud albedo [pdf]Paper  Natural aerosols explain seasonal and spatial patterns of Southern Ocean cloud albedo [link]Website  abstract   bibtex   
Atmospheric aerosols, suspended solid and liquid particles, act as nucleation sites for cloud drop formation, affecting clouds and cloud properties—ultimately influencing the cloud dynamics, lifetime, water path, and areal extent that determine the reflectivity (albedo) of clouds. The concentration N d of droplets in clouds that influences planetary albedo is sensitive to the availability of aerosol particles on which the droplets form. Natural aerosol concentrations affect not only cloud properties themselves but also modulate the sensitivity of clouds to changes in anthropogenic aerosols. It is shown that modeled natural aerosols, principally marine biogenic primary and secondary aerosol sources, explain more than half of the spatiotemporal variability in satellite-observed N d. Enhanced N d is spatially correlated with regions of high chlorophyll a, and the spatiotemporal variability in N d is found to be driven primarily by high concentrations of sulfate aerosol at lower Southern Ocean latitudes (35o to 45oS) and by organic matter in sea spray aerosol at higher latitudes (45o to 55oS). Biogenic sources are estimated to increase the summertime mean reflected solar radiation in excess of 10 W m–2 over parts of the Southern Ocean, which is comparable to the annual mean increases expected from anthropogenic aerosols over heavily polluted regions of the Northern Hemisphere.
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 title = {Natural aerosols explain seasonal and spatial patterns of Southern Ocean cloud albedo},
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 year = {2015},
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 abstract = {Atmospheric aerosols, suspended solid and liquid particles, act as nucleation sites for cloud drop formation, affecting clouds and cloud properties—ultimately influencing the cloud dynamics, lifetime, water path, and areal extent that determine the reflectivity (albedo) of clouds. The concentration N d of droplets in clouds that influences planetary albedo is sensitive to the availability of aerosol particles on which the droplets form. Natural aerosol concentrations affect not only cloud properties themselves but also modulate the sensitivity of clouds to changes in anthropogenic aerosols. It is shown that modeled natural aerosols, principally marine biogenic primary and secondary aerosol sources, explain more than half of the spatiotemporal variability in satellite-observed N d. Enhanced N d is spatially correlated with regions of high chlorophyll a, and the spatiotemporal variability in N d is found to be driven primarily by high concentrations of sulfate aerosol at lower Southern Ocean latitudes (35o to 45oS) and by organic matter in sea spray aerosol at higher latitudes (45o to 55oS). Biogenic sources are estimated to increase the summertime mean reflected solar radiation in excess of 10 W m–2 over parts of the Southern Ocean, which is comparable to the annual mean increases expected from anthropogenic aerosols over heavily polluted regions of the Northern Hemisphere.},
 bibtype = {article},
 author = {McCoy, D. T. and Burrows, S. M. and Wood, R. and Grosvenor, D. P. and Elliott, S. M. and Ma, P.-L. and Rasch, P. J. and Hartmann, D. L.},
 journal = {Science Advances},
 number = {6}
}
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