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Article: Alkaline rains on the Tibetan Plateau and their implication for the original pH of natural rainfall

TitleAlkaline rains on the Tibetan Plateau and their implication for the original pH of natural rainfall
Authors
KeywordsAerosol
Alkaline rain
Atmosphere
Rainwater chemistry
TibetanPlateau
Issue Date2002
PublisherAmerican Geophysical Union.
Citation
Journal Of Geophysical Research D: Atmospheres, 2002, v. 107 n. 14, p. 9-1-9-6 How to Cite?
AbstractNatural rains are generally considered as weakly acidic. Long-term measurement in the Tibetan capital city, Lhasa, reveals that alkaline rain is also natural. For the last 3 years the volume-weighted mean pH of rainwater is 7.5. Earlier observation shows even higher average pH values, such as 8.36 in the 1987-1988 period. The major cause of alkaline rain is the alkaline and soil-borne continental dusts in this semiarid area. Bicarbonate is the dominant anion in the water samples. The analysis also shows that the rainwater in this city contains few pollutants, compared with other places in the world. Measurements carried out in two additional industrial cities on the northern and northeastern Tibetan Plateau, Xining and Germu, demonstrate how fast human activities such as industrial development may increase rainwater acidity. In a period of 13 years the rainfall pH value of Germu has dropped from 8.03 to 6.8, representing a manyfold increase of the H+ concentration. Such an increase was caused by rising contents of NO3 - and SO4 -2 in the atmosphere. On the basis of the measurements on the Tibetan Plateau, evidence from other places around the world, and the experiments and calculation, the authors believe that the original pH of natural rainwater in arid and semiarid areas on this planet should be weakly alkaline because of the influence of alkaline dusts. Copyright 2002 by the American Geophysical Union.
Persistent Identifierhttp://hdl.handle.net/10722/54351
ISSN
2015 Impact Factor: 3.318
2015 SCImago Journal Rankings: 2.310
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, DDen_HK
dc.contributor.authorPeart, MRen_HK
dc.contributor.authorJim, CYen_HK
dc.contributor.authorLa, Jen_HK
dc.date.accessioned2009-04-03T07:44:12Z-
dc.date.available2009-04-03T07:44:12Z-
dc.date.issued2002en_HK
dc.identifier.citationJournal Of Geophysical Research D: Atmospheres, 2002, v. 107 n. 14, p. 9-1-9-6en_HK
dc.identifier.issn0148-0227en_HK
dc.identifier.urihttp://hdl.handle.net/10722/54351-
dc.description.abstractNatural rains are generally considered as weakly acidic. Long-term measurement in the Tibetan capital city, Lhasa, reveals that alkaline rain is also natural. For the last 3 years the volume-weighted mean pH of rainwater is 7.5. Earlier observation shows even higher average pH values, such as 8.36 in the 1987-1988 period. The major cause of alkaline rain is the alkaline and soil-borne continental dusts in this semiarid area. Bicarbonate is the dominant anion in the water samples. The analysis also shows that the rainwater in this city contains few pollutants, compared with other places in the world. Measurements carried out in two additional industrial cities on the northern and northeastern Tibetan Plateau, Xining and Germu, demonstrate how fast human activities such as industrial development may increase rainwater acidity. In a period of 13 years the rainfall pH value of Germu has dropped from 8.03 to 6.8, representing a manyfold increase of the H+ concentration. Such an increase was caused by rising contents of NO3 - and SO4 -2 in the atmosphere. On the basis of the measurements on the Tibetan Plateau, evidence from other places around the world, and the experiments and calculation, the authors believe that the original pH of natural rainwater in arid and semiarid areas on this planet should be weakly alkaline because of the influence of alkaline dusts. Copyright 2002 by the American Geophysical Union.en_HK
dc.languageengen_HK
dc.publisherAmerican Geophysical Union.en_HK
dc.relation.ispartofJournal of Geophysical Research D: Atmospheresen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAerosolen_HK
dc.subjectAlkaline rainen_HK
dc.subjectAtmosphereen_HK
dc.subjectRainwater chemistryen_HK
dc.subjectTibetanPlateauen_HK
dc.titleAlkaline rains on the Tibetan Plateau and their implication for the original pH of natural rainfallen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0148-0227&volume=107&issue=D14&spage=4198&epage=&date=2002&atitle=Alkaline+rains+on+the+Tibetan+Plauteau+and+their+implication+for+the+original+pH+of+natural+rainfallen_HK
dc.identifier.emailZhang, DD:zhangd@hkucc.hku.hken_HK
dc.identifier.emailPeart, MR:mrpeart@hkucc.hku.hken_HK
dc.identifier.emailJim, CY:hragjcy@hkucc.hku.hken_HK
dc.identifier.authorityZhang, DD=rp00649en_HK
dc.identifier.authorityPeart, MR=rp00612en_HK
dc.identifier.authorityJim, CY=rp00549en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1029/2001JD001332en_HK
dc.identifier.scopuseid_2-s2.0-20444373163en_HK
dc.identifier.hkuros80646-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-20444373163&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume107en_HK
dc.identifier.issue14en_HK
dc.identifier.spage9en_HK
dc.identifier.epage1en_HK
dc.identifier.isiWOS:000178977300031-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZhang, DD=9732911600en_HK
dc.identifier.scopusauthoridPeart, MR=7003362850en_HK
dc.identifier.scopusauthoridJim, CY=7006143750en_HK
dc.identifier.scopusauthoridLa, J=12144035400en_HK

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