Are There Any Counteracting Effects that Reduce the Global Warming Benefits Attributed to Black Carbon Controls. Assessment of Cloud Drop Number concentration Changes and Its Importance in Modeling Cloud Albedo Effects on Climate.

摘要

This report provides an assessment of the relative importance of the first indirect aerosol effect of black carbon forcing for California's climate constrained with measurements by developing a balanced approach between observations, data analyses, and modeling studies. Previous studies in California have indicated that emission control policies have resulted in a 50% decline in BC aerosols. This decline is expected to have a cooling effect due to reduced direct absorption, but the impact on cloud processes is less certain. The report will also address the importance of the internal mixing state and hygroscopicity of the aerosols in addition to total concentration on the secondary aerosol effects.