Since forcing due to SO 2 emissions peaked in 1966 and has been declining since, this implies that a simple time series analysis of mean precipitation in this region for the last half of the 20th century (e.g., from 1950 onward) might show a negative trend.
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Anthropogenic aerosols mask increases in US rainfall by greenhouse gases.
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The fast response has a highly significant drying effect for CONUS-average mean precipitation in the winter; in summer and autumn, the fast response instead results in (primarily) enhancements to mean and extreme precipitation, as found in prior multi-model experiments concerning the response of precipitation to sulfates (see below for further detail).