Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 10 14 2010 10.5194/acp-10-6603-2010 http://www.atmos-chem-phys.net/10/6603/2010/ http://www.atmos-chem-phys.net/10/6603/2010/acp-10-6603-2010.html http://www.atmos-chem-phys.net/10/6603/2010/acp-10-6603-2010.pdf 6603 6615 2010-07-19 Estimated impact of black carbon deposition during pre-monsoon season from Nepal Climate Observatory – Pyramid data and snow albedo changes over Himalayan glaciers T. J. Yasunari teppei.j.yasunari@nasa.gov P. Bonasoni P. Laj K. Fujita E. Vuillermoz A. Marinoni P. Cristofanelli R. Duchi G. Tartari K.-M. Lau NASA Goddard Space Flight Center, Greenbelt, USA Goddard Earth Science and Technology Center, University of Maryland Baltimore County, Baltimore, USA CNR – Institute for Atmospheric Sciences and Climate, Bologna, Italy Ev-K2-CNR Committee, Bergamo, Italy Laboratoire de Glaciologie et Géophysique de l'Environnement, Université Grenoble 1 – CNRS (UMR5183), St. Martin d'Heres, France Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan CNR – Water Research Institute, Brugherio, Italy The possible minimal range of reduction in snow surface albedo due to dry deposition of black carbon (BC) in the pre-monsoon period (March–May) was estimated as a lower bound together with the estimation of its accuracy, based on atmospheric observations at the Nepal Climate Observatory – Pyramid (NCO-P) sited at 5079 m a.s.l. in the Himalayan region. A total BC deposition rate was estimated as 2.89 μg m−2 day−1 providing a total deposition of 266 μg m−2 for March–May at the site, based on a calculation with a minimal deposition velocity of 1.0×10−4 m s−1 with atmospheric data of equivalent BC concentration. Main BC size at NCO-P site was determined as 103.1–669.8 nm by correlation analyses between equivalent BC concentration and particulate size distributions in the atmosphere. The BC deposition from the size distribution data was also estimated. It was found that 8.7% of the estimated dry deposition corresponds to the estimated BC deposition from equivalent BC concentration data. If all the BC is deposited uniformly on the top 2-cm pure snow, the corresponding BC concentration is 26.0–68.2 μg kg−1, assuming snow density variations of 195–512 kg m−3 of Yala Glacier close to NCO-P site. Such a concentration of BC in snow could result in 2.0–5.2% albedo reductions. By assuming these albedo reductions continue throughout the year, and then applying simple numerical experiments with a glacier mass balance model, we estimated reductions would lead to runoff increases of 70–204 mm of water. This runoff is the equivalent of 11.6–33.9% of the annual discharge of a typical Tibetan glacier. Our estimates of BC concentration in snow surface for pre-monsoon season is comparable to those at similar altitudes in the Himalayan region, where glaciers and perpetual snow regions begin, in the vicinity of NCO-P. Our estimates from only BC are likely to represent a lower bound for snow albedo reductions, because we used a fixed slower deposition velocity. In addition, we excluded the effects of atmospheric wind and turbulence, snow aging, dust deposition, and snow albedo feedbacks. 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