Based on the comprehensive analysis of long-term observation data of aerosols and meteorology on the Qinghai Tibet Plateau, Arctic sea ice data, reanalysis data of European Meteorological Center, etc., Cong Zhiyuan, researcher of Alpine environmental quality and safety team of Institute of Qinghai Tibet Plateau, Chinese Academy of Sciences, and other units, such as Bergen University, Nanjing University of information technology, Norwegian Institute of atmospheric research, Northwest Institute of ecological environment and resources, Chinese Academy of Sciences, etc The cooperation found that the reduction of Arctic sea ice intensifies the transportation of aerosols and other pollutants to the Qinghai Tibet Plateau. The results were published online in nature climate change on August 31, providing a new perspective for understanding the cross-border transport of pollutants in the Qinghai Tibet Plateau. The Qinghai Tibet Plateau and the Arctic are the cleanest regions in the world. Under the influence of atmospheric circulation, aerosols and other atmospheric pollutants emitted from South and Central Asia around the Qinghai Tibet Plateau cross-border and affect its climate and environment. At present, there is still a lack of deep understanding of the specific characteristics and related mechanisms of pollutant cross-border transport in the region. By analyzing the long-term aerosol observation data in Namco and Mt. Everest, researchers found that most of the aerosol optical depth (AOD) presents an obvious annual peak in April. During this period, it is the high incidence period of pollution events such as forest fires and crop residues burning in South Asia. Dr. Li Fei of Bergen University in Norway, the first author of the paper, said that under the background of global warming, the Arctic sea ice is melting faster. Through statistical diagnosis analysis, it is found that the decrease of sea ice in the North Atlantic side of the Arctic in February makes the sea surface and atmospheric bottom layer abnormally warm, and the atmospheric temperature gradient in the Arctic and mid latitude decreases. According to the principle of thermal wind, the polar jet is weakened, and the warm and wet ocean current transporting to the high latitude Eurasia inland is reduced, which leads to the decrease of snow depth near the Ural Mountain from February to April, and then affects the large-scale disturbance of the westerly belt in April, and strengthens the subtropical westerly jet in East Asia. Affected by the topography of the Qinghai Tibet Plateau, the enhanced updraft combined with the mesoscale circulation system such as the valley wind over the Tibetan Plateau accelerated the South Asian pollutants to cross the Himalayas and enter the Tibetan Plateau. < / P > < p > “under the background of global warming, the melting of Arctic sea ice in winter is intensified, which affects the atmospheric circulation, strengthens the westerly jet, increases the pollutants transported to the plateau, and accelerates the melting of glaciers on the Qinghai Tibet Plateau. At present, the Qinghai Tibet Plateau is still clean as a whole. If the external disturbance continues to increase, it will cause a series of environmental risks Dr Wan Xin, co-author of the article, said the Institute of Qinghai Tibet Plateau, Chinese Academy of Sciences. At present, the warming rate of the Qinghai Tibet Plateau is twice the global average warming rate. From the perspective of global linkage, reducing anthropogenic emissions is the only way to control environmental risks. The “Pan third pole” horizontal and vertical circulation anomalies associated with less Arctic sea ice in April, and the “Arctic Ural Mountain Qinghai Tibet Plateau teleconnection” schematic diagram are also presented= target=_ blank>Global Tech