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Article: Precipitation chemistry of Lhasa and other remote towns, Tibet

TitlePrecipitation chemistry of Lhasa and other remote towns, Tibet
Authors
KeywordsAirborne dust
Alkaline precipitation
CO2
PH
Rainwater chemistry
Issue Date2003
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/atmosenv
Citation
Atmospheric Environment, 2003, v. 37 n. 2, p. 231-240 How to Cite?
AbstractPrecipitation 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 -, SO4 2-Br-, HCO3 - and HPO4 2-. 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 1987-1988 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 SO4 2- in precipitation, alerts us to the urgency of environmental protection in this fragile paradise. © 2002 Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/54352
ISSN
2014 Impact Factor: 3.281
2014 SCImago Journal Rankings: 1.431
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, DDen_HK
dc.contributor.authorPeart, Men_HK
dc.contributor.authorJim, CYen_HK
dc.contributor.authorHe, YQen_HK
dc.contributor.authorLi, BSen_HK
dc.contributor.authorChen, JAen_HK
dc.date.accessioned2009-04-03T07:44:14Z-
dc.date.available2009-04-03T07:44:14Z-
dc.date.issued2003en_HK
dc.identifier.citationAtmospheric Environment, 2003, v. 37 n. 2, p. 231-240en_HK
dc.identifier.issn1352-2310en_HK
dc.identifier.urihttp://hdl.handle.net/10722/54352-
dc.description.abstractPrecipitation 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 -, SO4 2-Br-, HCO3 - and HPO4 2-. 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 1987-1988 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 SO4 2- in precipitation, alerts us to the urgency of environmental protection in this fragile paradise. © 2002 Elsevier Science Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/atmosenven_HK
dc.relation.ispartofAtmospheric Environmenten_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAirborne dusten_HK
dc.subjectAlkaline precipitationen_HK
dc.subjectCO2en_HK
dc.subjectPHen_HK
dc.subjectRainwater chemistryen_HK
dc.titlePrecipitation chemistry of Lhasa and other remote towns, Tibeten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1352-2310&volume=37&issue=2&spage=231&epage=240&date=2003&atitle=Precipitation+chemistry+of+Lhasa+and+other+remote+towns,+Tibeten_HK
dc.identifier.emailZhang, DD:zhangd@hkucc.hku.hken_HK
dc.identifier.emailPeart, M:mrpeart@hkucc.hku.hken_HK
dc.identifier.emailJim, CY:hragjcy@hkucc.hku.hken_HK
dc.identifier.authorityZhang, DD=rp00649en_HK
dc.identifier.authorityPeart, M=rp00612en_HK
dc.identifier.authorityJim, CY=rp00549en_HK
dc.description.naturepostprinten_HK
dc.identifier.doi10.1016/S1352-2310(02)00835-Xen_HK
dc.identifier.scopuseid_2-s2.0-0037213151en_HK
dc.identifier.hkuros80650-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037213151&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume37en_HK
dc.identifier.issue2en_HK
dc.identifier.spage231en_HK
dc.identifier.epage240en_HK
dc.identifier.isiWOS:000180455000006-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhang, DD=9732911600en_HK
dc.identifier.scopusauthoridPeart, M=7003362850en_HK
dc.identifier.scopusauthoridJim, CY=7006143750en_HK
dc.identifier.scopusauthoridHe, YQ=7404942217en_HK
dc.identifier.scopusauthoridLi, BS=23389484100en_HK
dc.identifier.scopusauthoridChen, JA=7501884047en_HK

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