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	Precipitation chemistry of Lhasa and other remote towns, Tibet
	Zhang, DD; Peart, M; Jim, CY; He, YQ; Li, BS; Chen, JA
刊名	ATMOSPHERIC ENVIRONMENT
	2003
卷号	37期号:2页码:231-240
关键词	alkaline precipitation pH airborne dust CO2 rainwater chemistry
ISSN号	1352-2310
通讯作者	Zhang, DD()
英文摘要	Precipitation event samples during 1987-1988 field expedition periods and 1997, 1998, 1999 and 2000 have been collected at Lhasa, Dingri, Dangxiong and Amdo, Tibet. The sampling and analysis were based on WMO recommendations for a background network with some modifications according to local conditions and environmental characteristics. The following precipitation constituents and related parameters were measured: pH, conductivity, CO2 partial pressure, total suspended particles, and the content of K+, Na+, Ca2+, Mg2+, Fe, Mn, NH4+, Cl-, NO2-, NO3-, SO42- Br-, HCO3- and HPO42-. Some atmospheric dust samples have also been collected. Over 300 precipitation events have been measured for pH and conductivity. Among these, 60 have been analysed for their chemical components. The results show that Lhasa's precipitation events were constantly alkaline with weighted averages of pH 8.36 in the 19871988 period, and 7.5 for 1997 to 1999. Only one event was weakly acidic during 1997-1999. Although CO2 partial pressure, a major producer of acidity in natural water on the Plateau, falls with increasing elevation, the lowest measured CO2 partial pressure can only raise pH value by 0.1 units in the sampling areas. Chemical analysis indicates that the major contributor to alkaline precipitation is the continental dust, which is rich in calcium. The analysis also shows that Tibet is still one of the cleanest areas in the world with little air pollution. However, the decline of pH from the 1980s to 1990s, which was reflected by an increase of NO3- and SO42- in precipitation, alerts us to the urgency of environmental protection in this fragile paradise. (C) 2002 Elsevier Science Ltd. All rights reserved.
收录类别	SCI
WOS关键词	ACID-RAIN ; ALKALINE ; CHINA ; IMPACT ; WATER ; INDIA ; DUST ; PH
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000180455000006
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2556890
专题	寒区旱区环境与工程研究所
通讯作者	Zhang, DD
作者单位	1.Univ Hong Kong, Dept Geog, Hong Kong, Hong Kong, Peoples R China 2.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China 3.S China Normal Univ, Dept Geog, Guangzhou, Peoples R China 4.Chinese Acad Sci, State Key Lab Environm Geochem, Guiyang, Guizhou, Peoples R China
推荐引用方式 GB/T 7714	Zhang, DD,Peart, M,Jim, CY,et al. Precipitation chemistry of Lhasa and other remote towns, Tibet[J]. ATMOSPHERIC ENVIRONMENT,2003,37(2):231-240.
APA	Zhang, DD,Peart, M,Jim, CY,He, YQ,Li, BS,&Chen, JA.(2003).Precipitation chemistry of Lhasa and other remote towns, Tibet.ATMOSPHERIC ENVIRONMENT,37(2),231-240.
MLA	Zhang, DD,et al."Precipitation chemistry of Lhasa and other remote towns, Tibet".ATMOSPHERIC ENVIRONMENT 37.2(2003):231-240.

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