Title Longwave indirect effect of mineral dusts on ice clouds
Author Min, Q.; Li, R.
Author Affil Min, Q., State University of New York, Atmospheric Sciences Research Center, Albany, NY
Source Atmospheric Chemistry and Physics, 10(16), p.7753-7761, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680- 7316
Publication Date 2010
Notes In English. Published in Atmospheric Chemistry and Physics Discussions: 15 January 2010, http://www.atmos-chem-phys- discuss.net/10/763/2010/acpd-10-763- 2010.html; accessed in June, 2011. 34 refs. GeoRef Acc. No: 310024
Index Terms aerosols; albedo; precipitation (meteorology); biomass; clouds (meteorology); convection; cooling; density (mass/volume); dust; freezing; grain size; human activity; ice; minerals; nucleation; pollution; sediments; solar radiation; statistical analysis; temperature; air pollution; atmospheric precipitation; atmospheric transport; clastic sediments; climate forcing; clouds; density; heterogeneity; MODIS; sea-surface temperature; solar forcing; time series analysis; transport
Abstract In addition to microphysical changes in clouds, changes in nucleation processes of ice cloud due to aerosols would result in substantial changes in cloud top temperature as mildly supercooled clouds are glaciated through heterogenous nucleation processes. Measurements from multiple sensors on multiple observing platforms over the Atlantic Ocean show that the cloud effective temperature increases with mineral dust loading with a slope of +3.06C per unit aerosol optical depth. The macrophysical changes in ice cloud top distributions as a consequence of mineral dust-cloud interaction exert a strong cooling effect (up to 16 Wm-2) of thermal infrared radiation on cloud systems. Induced changes of ice particle size by mineral dusts influence cloud emissivity and play a minor role in modulating the outgoing longwave radiation for optically thin ice clouds. Such a strong cooling forcing of thermal infrared radiation would have significant impacts on cloud systems and subsequently on climate.
URL http://www.atmos-chem-phys.net/10/7753/2010/acp-10-7753-2010.pdf
Publication Type journal article
Record ID 65006828