ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Physical and Chemical Characteristics of Precipitation within the Warm Sector of a Quasi-stationary Front in South China
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Abstract:
The results are presented of a comprehensive observational analysis of physical and chemical characteristics of precipitation within the warm sector of a quasi-stationary front in South China.It is found that(1) inside the warm sector the mild raindrop concentration in the cumulus rainfall is associated with reasonably large drop diameter, with spectral pattern dominated by multiple peaks; (2) the pH value of the rainwater is low,averagihg at 4. 43,and NO,Cl-,SO,NH and Na+ are highly concentrated among the compositions of ions; (3) the scavenging rate for this rainfall is 45 % of the total mass of aerosols,especially higher for Cl-,F- and NO;(4) because the scavenging rate is large for the anion (mainly NO) and small for the cation in the aerosols,the pH value is decreased,becoming one of the causes for the relatively higher acidity in the rainwater in this process of precipitation.
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