摘要
通过对2010年1月1日到2015年12月31日长江源区402个降水样品的pH值、电导率(electrical conductivity,EC)以及降水量和风速的分析,特别是对14次酸雨事件的重点分析,运用HYSPLIT模型来探讨长江源区酸雨的来源。结果表明:(1)长江源区出现了酸雨,且pH值小于6.5的降水占总降水次数的61.69%,长江源区已经受周边地区污染源的严重影响;(2)采样期间,长江源区的pH值的变化范围为4.0~8.57,平均值为6.37。EC的变化范围为5.2~124.4μs·cm-1,平均值为27.59μs·cm-1,pH值在四季中的大小顺序为:夏季>春季=冬季>秋季。EC的大小顺序为:春季>冬季>夏季>秋季;(3)长江源区的酸雨主要受西南季风和西风环流的影响,致使酸雨发生的污染物主要来源于印度、尼泊尔等国的工业污染物和其他污染物,穿越青藏线的各种车辆的汽车尾气为长江源地区增加了额外的污染源。
In order to research the characteristics and sources of acid rain in the source region of the Yangtze Riv- er. This paper collected 402 precipitation samples from January 1,2010 to December 31,2015. From the analysis of pH value, electrical conductivity （ EC）, precipitation and wind speed of precipitation samples in the source re- gion of the Yangtze River, especially for the analysis of the 14 acid rain events. And applied the HYSPLIT model to study the source of acid rain in the source area of the Yangtze River. The results show that： （ 1 ） Acid rain event occurred in the source region of the Yangtze river, and the precipitation of pH value less than 6.5 accoun- ted for 61. 69% of the total precipitation, the precipitation of pH value between 6. 5 and 7. 0 accounted for 37. 56%, the precipitation of pH value was over 7 accounted for 0.75%. The source region of the Yangtze Riv- er had been seriously affected by the pollution sources from the surrounding area; （2） During the period of sam- piing, the variation range of pH value was 4.0- 8.57, with the mean value 6.37. And the range of EC was 5. 2 - 124.4 μs · cm-1 , the average was 27. 59 μs · cm-1. The order of pH in four seasons was summer〉spring = winter〉autumn, the value was 6. 41, 6. 37, 6. 37 and 6.25, respectively. And the order of conductivity in the four seasons was spring〉winter〉summer〉autumn, with the value was 37. 62, 31. 86, 25. 75 and 24. 04 μs · cm-1 , respectively. （3） The source area of the Yangtze River was affected by the southwest monsoon from January 1, 2010 to December 31,2015, which had occurred 5 times, accounted for 35.71% of the total number of acid rain events. And the occurrence of acid rain events affected by the westerly circulation has been up to 64. 29% of the total number of times. So acid rain in the source region of the Yangtze River was mainly affected by the southwest monsoon and the westerly circulation. On the one hand, the occurrence of acid rain mainly con- trolled by industrial pollution
作者
王烈福
宋玲玲
蔡玉琴
李永格
吕越敏
袁瑞丰
桂娟
李宗杰
李宗省
WANG Liefu SONG Lingling CAI Yuqin LI Yongge LV Yuemin YUAN Ruifeng GUI Juan LI Zongjie LI Zongxing(Tuotuohe meteorological station, Qinghai Province, Geermu 816099, China College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China College of Forestry, Gansu Agricultural University, Lanzhou 730070, China Key Laboratory of eco hydrology of inland river basin, Northwest Institute of ecological and environmental resources, Chinese Academy of Sciences, Lanzhou 730000, China College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730000, China)
出处
《高原气象》
CSCD
北大核心
2017年第5期1386-1393,共8页
Plateau Meteorology
基金
国家自然科学基金项目(91547102)
甘肃省杰出青年基金项目(1506RJDA282)
关键词
长江源区
酸雨
后向轨迹
特征及来源
Source region of the Yangtze River
Acid rain
Backward trajectory simulation
Characteristics andsources
