Insights into the impact of light-absorbing impurities on radiative forcing and snowmelt in the Ili Basin in Central Asia
Wu B. Wu N. Issanova G. Ge Y. Chen J. Adili A. Abuduwaili J. Juliev M.
15 August 2025Academic Press Inc.
Environmental Research
2025#279
Light-absorbing impurities (LAIs), such as mineral dust (MD), organic carbon (OC), and black carbon (BC), deposited in snow, can reduce snow albedo and accelerate snowmelt. The Ili Basin, influenced by its unique geography and westerly atmospheric circulation, is a critical region for LAI deposition. However, quantitative assessments on the impact of LAIs on snow in this region remain limited. This study investigated the spatial distribution of LAIs in snow and provided a quantitative evaluation of the effects of MD and BC on snow albedo, radiative forcing, and snowmelt duration through sampling analysis and model simulations. The results revealed that the Kunes River Basin in the eastern Ili Basin exhibited relatively high concentrations of MD. In contrast, the southwestern Tekes River Basin showed relatively high concentrations of OC and BC. Among the impurities, MD plays a dominant role in the reduction of snow albedo and has a greater effect on the absorption of solar radiation by snow than BC, while MD is the most important light-absorbing impurity responsible for the reduction in the number of snow-melting days in the Ili Basin. Under the combined influence of MD and BC, the snowmelt period in the Ili Basin was reduced by 2.19 ± 1.43 to 7.31 ± 4.76 days. This study provides an initial understanding of the characteristics of LAIs in snow and their effects on snowmelt within the Ili Basin, offering essential basic data for future research on the influence of LAIs on snowmelt runoff and hydrological processes in this region.
Black carbon , Mineral dust , Radiative forcing , Snow albedo , Snowmelt
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Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences Urumqi, 830011, China
CAS Research Center for Ecology and Environment of Central Asia, Xinjiang, Urumqi, 830011, China
University of Chinese Academy of Sciences, Beijing, 100049, China
China-Kazakhstan Joint Laboratory for Remote Sensing Technology and Application, Al-Farabi Kazakh National University, Almaty, 050012, Kazakhstan
Faculty of Geography and Environmental Sciences, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
College of Ecology and Environment, Xinjiang University, Xinjiang, Urumqi, 830017, China
Institute of Fundamental and Applied Research, “TIIAME” NRU, Tashkent, 100000, Uzbekistan
Turin Polytechnic University in Tashkent, Tashkent, 100095, Uzbekistan
Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands
CAS Research Center for Ecology and Environment of Central Asia
University of Chinese Academy of Sciences
China-Kazakhstan Joint Laboratory for Remote Sensing Technology and Application
Faculty of Geography and Environmental Sciences
College of Ecology and Environment
Institute of Fundamental and Applied Research
Turin Polytechnic University in Tashkent
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