GEOPHYSICAL RESEARCH LETTERS, VOL. 25, NO. 9, PAGES 1423-1426, MAY 1, 1998

The effects of atmospheric sulfur on the radiative properties of convective clouds: a limited area modeling study

C. Andronache, L. J. Donner, V. Ramaswamy, C. J. Seman, and R. S. Hemler
Geophysical Fluid Dynamics Laboratory/NOAA, Princeton University, Princeton, New Jersey

Abstract. Convective clouds in tropical areas can be sensitive to the atmospheric sulfate loading, particularly during enhanced sulfate episodes. This assertion is supported by simulations with a high resolution limited area non-hydrostatic model (LAN) employing a detailed sulfate-cloud microphysics scheme, applied to estimate the effects of sulfate on convective clouds in a case study from the Tropical Ocean Global Atmosphere Coupled Ocean Atmosphere Response Experiment (TOGA COARE). Results show that a change in sulfate loading for scenarios using the minimum to the maximum observed values produces a change in the average net flux of shortwave radiation above clouds. This time-average change was estimated between -1.1 and -0.3 Wm-2 over the integration domain.


AGU Index Terms: 0320 Cloud physics and chemistry; 0345 Pollution-urban and regional; 3314 Convective processes; 3359 Radiative processes
Keywords/Free Terms: Convective clouds, Atmospheric sulfur, Cloud albedo, Cloud microphysics

Copyright 1998 by the American Geophysical Union.


Related links:
Tropical Ocean Global Atmospheres/Coupled Ocean Atmosphere Response Experiment (TOGA/COARE)