Light-absorbing impurities (LAIs), including black carbon (BC) and mineral dust, in snow can trigger a positive feedback. Recently, researchers estimated the contribution of BC and dust to glacial melting in Central Asia. Average BC and dust concentrations in the surface snow of the Muz Taw glacier are 1788 ± 1754 ng g−1 and 172 ± 178 μg g−1, respectively. Simulation using the Snow Ice and Aerosol Radiation (SNICAR) model indicates that the combined effect of BC and dust reduces the snow albedo by approximately 6.24% to 50.4% relative to clean snow. Radiative forcing (RF) induced by BC and dust deposited in snow ranges from 1.61 to 32.69 W m−2, with an average of 16.74 W m−2 for the central scenario. Thus, glacier melting can be enhanced by 36.37 cm w.e. by BC and dust in snow, accounting for about 16.3% of the total glacier melt. LAIs deposited on the Muz Taw glacier mostly originate from Central Asia, West Siberia and local emissions during the study period. More than 80% of BC deposited is attributed to anthropogenic emissions. These results strengthen the important role of BC and dust in glacier melting in Central Asia, and further highlights the potential benefits of mitigation of BC emissions.
The study was published in Science of the Total Environment, researchers from Northwest Institute of Eco-Environment and Resources of Chinese Academy of Sciences, Lanzhou University and Peking University collaborated in this study. Prof. ZHANG Yulan at Northwest Institute of Eco-Environment and Resources of Chinese Academy of Sciences is the first author of the study, who is also a master supervisor at University of Chinese Academy of Sciences; Prof. KANG Shichang at Northwest Institute of Eco-Environment and Resources of Chinese Academy of Sciences is the corresponding author, who is also a doctoral supervisor at University of Chinese Academy of Sciences.
