Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2489s&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 16, p. 2489-2492
Physics
3
Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Pollution-Urban And Regional, Meteorology And Atmospheric Dynamics: Radiative Processes
Scientific paper
The effect of sulfates on cloud microphysical and optical properties have been studied using data from a rural mountaintop location in the Mt. Mitchell State Park, North Carolina. Although the amended Clean Air Act has limited the sulfur emissions beginning 1990, we found the sulfate concentrations greater during 1993-97 compared to that during 1986-89. Cloud albedo inferred from satellite data and calculated from surface observations does not indicate a monotonic increase with increasing sulfates. The direct and indirect (cloud-mediated) sulfate forcing are assessed to be -4.8 and 4 W m-2. These values exceed current model predictions as evaluated by other investigators. Surface temperature records of the region during 1949-94 indicate a cooling trend tacitly supporting our assessment.
Menon Surabi
Saxena V. K.
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