Analysis on the variation of snow depth and its influencing factors in Tibetan Plateau
Based on the daily snow depth and surface solar radiation,monthly temperature,and precipitation data of the Tibetan Plateau,various statistical methods were used to analyze the characteristics of snow depth changes in the region in recent decades and their relationship with meteorological factors.Results show that the snow depth on the plateau showed a significant increasing trend in the 1970s and 1980s,and began to decrease after the mid-1990s.After 2000,the snow depth on the plateau still mainly decreased.The significantly reduced area is located in the Qiangtang Plateau,and the significantly increased area is located in the Himalayas,the Karakoram Mountains and the high altitude areas in the middle and east of the plateau.The sudden change of snow depth from less to more snow period mainly occurred in the mid-1960s to early 1970s,and the sudden change from more to less mainly occurred in the late 1990s to early 2000s.The snow depth in the western region of the Tibetan Plateau varies periodically from 13 to 17 years,while in the eastern region it varies periodically from 3 to 7 years.The decrease in surface solar radiation was the main factor contributing to the increase in snow cover on the plateau in the 1970s and 1980s,with a significant negative correlation between the two.The significant increase in temperature in the mid to late 1990s was the main factor contributing to the decrease in snow cover,with a negative correlation between the two.The overall correlation between precipitation and snow cover was positive.In the case of relatively low temperature and low surface solar radiation,the increase or decrease in precipitation had a more significant impact on snow cover.
万方数据
维普
