ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
The Long-term Variation Characteristics of Precipitation Acidity and Ion Components in the Taishan Region
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Abstract:
After long-term unremitting air pollution control, acid rain pollution situation in China has been significantly improved with the composition of atmospheric acid-causing pollutants changed. The causes and characteristics of acid rain in China are also undergoing profound changes. In order to understand the new characteristics of acid rain pollution in typical northern regions of China, based on the statistical analysis of precipitation pH and conductivity at Mt.Tai from 1993 to 2021 and at Tai"an Station from 2007 to 2021, this paper carried out synchronous precipitation chemical enhanced observations at the two stations from May 2018 to April 2019. The contributions of below-cloud processes and long-distance transport to precipitation acidification in the Taishan area were analyzed, combined with the early research results. The results show that the annual average value of precipitation pH in Mt.Tai varies from 4.36 to 6.47, and that in Tai"an Station are from 5.07 to 6.39. Since 2011, due to the incrementally decrease in SO2 and NOX emissions in China, the precipitation pH value has continued to rise and remain at a high level, and the conductivity has shown a continuous downward trend. The analysis results of ion components of precipitation samples obtained from May 2018 to April 2019 show that SO42- and NO3- are the main anions in precipitation, and NH4+ and Ca2+ are the main cations. The average chemical equivalent ratio of SO42- and NO3- in precipitation is about 1.21, which is significantly lower than the early observation results, indicating the increased influence of nitrogen oxides on acid precipitation. The below-cloud washing process leads the concentration of ion components in precipitation at Tai"an Station higher than that at Mt.Tai. The acid precipitation in the Taishan area is mainly affected by Shandong Province and surrounding provinces. The precipitation acidity at Mt.Tai and Tai"an Station is closely related to atmospheric pollutant emissions. The influence of below-cloud washing process on Tai"an Station is gradually decreasing, and? Mt.Tai is also affected by long-distance transport.
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