Abstract:To understand the chemical composition and temporal variations of precipitation in Beijing, one-week integrated dry deposition samples were collected for more than four years. Among 222 dry deposition samples, there existed more or less anion deficits. SO42- and Ca2+ were the most abundant anion and cation, followed by NO3- and NH4+, respectively. SO42-、NO3- and NH4+ exhibited similar seasonal pattern, with higher and lower concentrations occurring in summer and winter, respectively. Dry deposition samples usually appeared neutral, with narrow variations in their monthly averages but an evident seasonal pattern, i.e., lower level in summer and higher level in spring.
蔡阳阳, 杨复沫, 贺克斌, 马永亮, 奥田知明, 田中茂. 北京城区大气干沉降的水溶性离子特征[J]. 中国环境科学, 2011, 31(7): 1071-1076.
CAI Yang-Yang, YANG Fu-Mo, HE Ke-Bin, MA Yong-Liang, AO Tian-Zhi-Ming, TIAN Zhong-Mao. Characteristics of water-soluble ions in dry deposition in urban Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(7): 1071-1076.