Headline: Modulation of snow reflectance and snowmelt from Central Asian glaciers by anthropogenic black carbon

Deposited mineral dust and black carbon are known to reduce the albedo of snow and enhance melt. Here we estimate the contribution of anthropogenic black carbon (BC) to snowmelt in glacier accumulation zones of Central Asia based on in-situ measurements and modelling. Source apportionment suggests that more than 94% of the BC is emitted from mostly regional anthropogenic sources while the remaining contribution comes from natural biomass burning. Even though the annual deposition flux of mineral dust can be up to 20 times higher than that of BC, we find that anthropogenic BC causes the majority (60% on average) of snow darkening. This leads to summer snowmelt rate increases of up to 6.3% (7 cm a−1) on glaciers in three different mountain environments in Kyrgyzstan, based on albedo reduction and snowmelt models.

Publication Year
2017
Publication Type
Academic Articles
Citation

Schmale, J., Flanner, M., Kang, S., Sprenger, M., Zhang, Q., Guo, J., Li, Y., Schwikowski, M., Farinotti, D. (2017): Modulation of snow reflectance and snowmelt from Central Asian glaciers by anthropogenic black carbon. - Scientific Reports, 7, p. 40501.DOI: http://doi.org/10.1038/srep40501

DOI
10.1038/srep40501
Links
http://publications.iass-potsdam.de/pubman/item/escidoc:2004897:4/component/esc…
Projects involved
A Sustainable Atmosphere for the Kathmandu Valley (SusKat)