ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-4583-2010 Chemical composition of PM<sub>10</sub> and PM<sub>1</sub> at the high-altitude Himalayan station Nepal Climate Observatory-Pyramid (NCO-P) (5079 m a.s.l.) Decesari S. 1 Facchini M. C. 1 Carbone C. 1 Giulianelli L. 1 Rinaldi M. 1 Finessi E. 1 Fuzzi S. 1 Marinoni A. 1 Cristofanelli P. 1 Duchi R. 1 Bonasoni P. 1 Vuillermoz E. 2 Cozic J. 3 Jaffrezo J. L. 3 Laj P. 3 Institute for Atmospheric Sciences and Climate (ISAC), CNR, Bologna, Italy Ev-K2-CNR Committee, Bergamo, Italy Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE), CNRS/University of Grenoble, Grenoble, France 18 05 2010 10 10 4583 4596 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/10/4583/2010/acp-10-4583-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/4583/2010/acp-10-4583-2010.pdf

We report chemical composition data for PM<sub>10</sub> and PM<sub>1</sub> from the Nepal Climate Observatory-Pyramid (NCO-P), the world's highest aerosol observatory, located at 5079 m a.s.l. at the foothills of Mt. Everest. Despite its high altitude, the average PM<sub>10</sub> mass apportioned by the chemical analyses is of the order of 6 &mu;g m<sup>−3</sup> (i.e., 10 &mu;g/scm), with almost a half of this mass accounted for by organic matter, elemental carbon (EC) and inorganic ions, the rest being mineral dust. Organic matter, in particular, accounted for by 2.0 &mu;g m<sup>−3</sup> (i.e., 3.6 &mu;g/scm) on a yearly basis, and it is by far the major PM<sub>10</sub> component beside mineral oxides. Non-negligible concentrations of EC were also observed (0.36 &mu;g/scm), confirming that light-absorbing aerosol produced from combustion sources can be efficiently transported up the altitudes of Himalayan glaciers. The concentrations of carbonaceous and ionic aerosols follow a common time trend with a maximum in the premonsoon season, a minimum during the monsoon and a slow recovery during the postmonsoon and dry seasons, which is the same phenomenology observed for other Nepalese Himalayan sites in previous studies. Such seasonal cycle can be explained by the seasonal variations of dry and moist convection and of wet scavenging processes characterizing the climate of north Indian subcontinent. We document the effect of orographic transport of carbonaceous and sulphate particles upslope the Himalayas, showing that the valley breeze circulation, which is almost permanently active during the out-of-monsoon season, greatly impacts the chemical composition of PM<sub>10</sub> and PM<sub>1</sub> in the high Himalayas and provides an efficient mechanism for bringing anthropogenic aerosols into the Asian upper troposphere (>5000 m a.s.l.). The concentrations of mineral dust are impacted to a smaller extent by valley breezes and follow a unique seasonal cycle which suggest multiple source areas in central and south-west Asia. Our findings, based on two years of observations of the aerosol chemical composition, provide clear evidence that the southern side of the high Himalayas is impacted by transport of anthropogenic aerosols which constitute the Asian brown cloud.

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