Spatial and temporal distribution characteristics of strong cold air and cold wave in Xinjiang from 1961 to 2020
Based on the temperature and precipitation observation daily data of 99 meteorological stations in Xin-jiang from 1961 to 2020,the characteristics of regional strong cold air and cold wave in Xinjiang were analyzed by using correlation analysis and linear trend analysis,as well as the dry and wet conditions of strong cold air and cold wave in Xinjiang were recognized using the precipitation data. The results showed that:(1) The fre-quency of regional strong cold air and cold wave in Xinjiang showed a decreasing trend,which was mainly mani-fested in the decrease of the frequency of strong cold air and cold wave in autumn,especially in 2010s. (2) The occurrence frequency of cold wave in Xinjiang was relatively close during the three months of winter. In spring and autumn the cold wave occurred most in November,followed by March and April. The occurrence time of super strong cold wave mainly concentrated in December and January,and the frequency of strong cold wave was the highest in February. (3) During the cold wave in Xinjiang,the minimum temperature increased and the cooling amplitude decreased,respectively,and both the mean and maximum precipitation increased significant-ly since the 1990s. Meanwhile,the cooling amplitude of the regional cold wave in Xinjiang in winter was about 1 ℃ larger than that in spring and autumn. (4) The minimum temperature and the maximum precipitation during cold wave process occurred in the Altai Mountains and Tianshan Mountains. In spring and autumn the cold wave in Xinjiang was usually normal or dry process,while in winter 76.4％ processes were normal dry,and 85.7％ of the wet and wet processes were concentrated in the 1990s. The preliminary identification of the dry and wet con-ditions of the cold wave was helpful to understand the new climate characteristics of the cold wave in Xinjiang more comprehensively and serve for disaster prevention and mitigation. (5) In winter,most stations in Northern Xinjiang and Tianshan Mountains reached the cold wave standard in 72 hours,while in Southern Xinjiang,most stations reached the cold wave standard in 24 hours.
NETL
NSTL
万方数据
