Spatial features of rain frequency change and pollution and associated aerosols Y. Lin1,2, Q. Min2, G. Zhuang1, Z. Wang3, W. Gong3, and R. Li2 1Department of Environmental Science and Engineering, Fudan University, China 2Atmospheric Sciences Research Center, State University of New York, USA 3Department of Environmental Science, Wuhan University, China
Abstract. A spatial-temporal analysis has been conducted using satellite observed
distributions of rain frequency, NO2 concentration and aerosol, with
focus on the spring season in East Asia. As NO2 is a key precursor of
secondary aerosols, especially in urban areas, an increase of NO2
emission is generally accompanied by an increase of fine aerosol particles.
Comparison between trends in rain frequency and in precipitation amount
shows that the changes in precipitation are more due to changes in
precipitation occurrence than in precipitation amount. The overall feature
emerged from the region-by-region analyses is that there is an inverse
relationship between the rain frequency and the pollution and associated
aerosols at continental scale in spring. The change in rain frequency is
associated with changes in pollution-produced aerosols and long-range
transport mineral dust. The inverse relationship at large temporal and
spatial scales illustrates potential climatological consequence of changed
pollution and aerosols on precipitation. Due to relatively short duration of
observation and the potential uncertainty and bias associated with satellite
measurements, more robust longer-term statistical study at various temporal
and spatial scales and detailed modeling investigation are warranted to
understand the physical causality of observed relationship between the rain
frequency and the pollution and associated aerosols.
Citation: Lin, Y., Min, Q., Zhuang, G., Wang, Z., Gong, W., and Li, R.: Spatial features of rain frequency change and pollution and associated aerosols, Atmos. Chem. Phys., 11, 7715-7726, doi:10.5194/acp-11-7715-2011, 2011.