气候变化领域集成服务门户(CCPortal): High frequency new particle formation in the Himalayas

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DOI	10.1073/pnas.0801355105
	High frequency new particle formation in the Himalayas
	Venzac H.; Sellegri K.; Laj P.; Villani P.; Bonasoni P.; Marinoni A.; Cristofanelli P.; Calzolari F.; Fuzzi S.; Decesari S.; Facchini M.-C.; Vuillermoz E.; Verza G.P.
发表日期	2008
ISSN	0027-8424
起始页码	15666
结束页码	15671
卷号	105 期号:41
英文摘要	Rising air pollution levels in South Asia will have worldwide environmental consequences. Transport of pollutants from the densely populated regions of India, Pakistan, China, and Nepal to the Himalayas may lead to substantial radiative forcing in South Asia with potential effects on the monsoon circulation and, hence, on regional climate and hydrological cycles, as well as to dramatic impacts on glacier retreat. An improved description of particulate sources is needed to constrain the simulation of future regional climate changes. Here, the first evidence of very frequent new particle formation events occurring up to high altitudes is presented. A 16-month record of aerosol size distribution from the Nepal Climate Observatory at Pyramid (Nepal, 5,079 m above sea level), the highest atmospheric research station, is shown. Aerosol concentrations are driven by intense ultrafine particle events occurring on >35% of the days at the interface between clean tropospheric air and the more polluted air rising from the valleys. During a pilot study, we observed a significant increase of ion cluster concentrations with the onset of new particle formation events. The ion clusters rapidly grew to a 10-nm size within a few hours, confirming, thus, that in situ nucleation takes place up to high altitudes. The initiation of the new particle events coincides with the shift from free tropospheric downslope winds to thermal upslope winds from the valley in the morning hours. The new particle formation events represent a very significant additional source of particles possibly injected into the free troposphere by thermal winds. © 2008 by The National Academy of Sciences of the USA.
英文关键词	Aerosols; Free troposphere; High altitude; Nucleation
语种	英语
scopus关键词	ion; aerosol; air monitoring; air pollution; altitude; article; atmosphere; climate; concentration (parameters); geographic distribution; particle size; particulate matter; pilot study; priority journal; sea level; troposphere; wind; Aerosols; Air Movements; Air Pollutants; Altitude; Atmosphere; Ions; Nanoparticles; Nepal; Particulate Matter
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159168
作者单位	Venzac, H., Laboratoire de Météorologie Physique, Observatoire de Physique du Globe de Clermont-Ferrand, Université Blaise Pascal, 24 avenue des Landais, 63177 Aubière, France; Sellegri, K., Laboratoire de Météorologie Physique, Observatoire de Physique du Globe de Clermont-Ferrand, Université Blaise Pascal, 24 avenue des Landais, 63177 Aubière, France; Laj, P., Laboratoire de Météorologie Physique, Observatoire de Physique du Globe de Clermont-Ferrand, Université Blaise Pascal, 24 avenue des Landais, 63177 Aubière, France, Consiglio Nazionale Delle Ricerche, Institute for Atmospheric Sciences and Climate, via Gobetti 101, I-40129 Bologna, Italy, Laboratoire de Glaciologie et Géophysique de l'Environnement, Observatoire de Sciences de l'Univers de Grenoble, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France; Villani, P., Laboratoire de Météorologie Physique, Observatoire de Physique du Globe de Clermont-Ferrand, Université Blaise Pascal, 24 avenue des Landais, 63177 Aubière, France; Bonasoni...
推荐引用方式 GB/T 7714	Venzac H.,Sellegri K.,Laj P.,et al. High frequency new particle formation in the Himalayas[J],2008,105(41).
APA	Venzac H..,Sellegri K..,Laj P..,Villani P..,Bonasoni P..,...&Verza G.P..(2008).High frequency new particle formation in the Himalayas.Proceedings of the National Academy of Sciences of the United States of America,105(41).
MLA	Venzac H.,et al."High frequency new particle formation in the Himalayas".Proceedings of the National Academy of Sciences of the United States of America 105.41(2008).