Black Carbon Size in Snow of Chinese Altai Mountain in Central Asia  

作　　者：Yulan ZHANG Shichang KANG Tanguang GAO Michael SPRENGER Wei ZHANG Zhaoqing WANG 

机构地区：[1]State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [2]Key Laboratory of Western China’s Environmental System(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China [3]Institute for Atmospheric and Climate Science,ETH Zurich,CH-8092 Zurich,Switzerland [4]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Advances in Atmospheric Sciences》2023年第7期1199-1211,共13页大气科学进展（英文版）

基　　金：supported by the second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0605);the National Science Foundation of China(42271132);Longyuan Youth Innovative Program of Gansu Province;the Fundamental Research Funds for the Central Universities(lzujbky-2021-74)。

摘　　要：Black carbon(BC)in snow plays an important role to accelerate snow melting.However,current studies mostly focused on BC concentrations,few on their size distributions in snow which affected BC’s effect on albedo changes.Here we presented refractory BC(rBC)concentrations and size distributions in snow collected from Chinese Altai Mountains in Central Asia from November 2016 to April 2017.The results revealed that the average rBC concentrations were 5.77 and2.82 ng g-1for the surface snow and sub-surface snow,which were relatively higher in the melting season(April)than that in winter(November-January).The mass median volume-equivalent diameter of rBC size in surface snow was approximately at 120-150 nm,which was typically smaller than that in the atmosphere(about 200 nm for urban atmosphere).However,there existed no specific mass median volume-equivalent diameter of BC size for sub-surface snow in winter.While during the melting season,the median mass size of rBC in sub-surface snow was similar to that in surface snow.Backward trajectories indicated that anthropogenic sourced BC dominated rBC in snow(70%-85%).This study will promote our understanding on BC size distributions in snow,and highlight the possible impact of BC size on climate effect.

关 键 词：black carbon snow cover snow melting Central Asia 

分 类 号：P426.635[天文地球—大气科学及气象学]