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《Desert and Oasis Meteorology》 2018-06
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The Frequency Variation of Cold Air Process in Southern Xinjiang During 1971-2016

XIE Fang;LIU Haitao;ZHANG Xiangjun;LIU Haihong;LI Jiangang;Institute of Desert Meteorology,China Meteorological Administration;Xinjiang Meteorological Administration;Hotan City Meteorological Bureau;Minfeng Agricultural Broadcasting and Television School;  
Based on the daily minimum temperature of 50 weather stations around the Tarim basin of Southern Xinjiang during 1971-2016,the temporal-spatial frequency distribution of the cold air process in single station and the whole area were analyzed by means of synthesis,linear propensity estimation,morlet wavelet,Mann-Kendall and Moving average and Cumulative anomaly according to"Cold Air Grate Standards"(GB/T20484-2006). The results showed that:(1) the cold air process which grade is medium and above was mostly distributed in the plateau,the mountainous area and the windy area. The cold air process of each grade in single station showed a linear decrease trend and not obvious in the most stations. The cold air and cold wave process decreased significantly in Southern Xinjiang which the decreasing rates were 0.19 times/10 a. However,the remaining grade has a little change.(2)The occurrence of cold air process was 103.2 times a year in the area,among them the weak and medium process occupied for 86.3 and 10.4 times,which amount to 83.6% and 10.1%respectively. The grade above strong cold air was totally 7.0 times,accounting for 6.8% of the total number.(3)The frequency percent of each cold air grade with 1 ~ 3 d was 87.4 ~ 95.4%,weak cold air with 1d duration and other process grade with 2 d duration has the highest frequency. The frequency with 3 days or above decreased significantly with the increase of duration.(4) The interdecadal frequency of different cold air process grades has little change. In 1970 s,the stronger,strong cold air and cold wave frequency was 2.8,2.4 and 2.9 times respectively. In 1980 s,the weak cold air reached 86.6 times. In the nearly 6 years(2011-2016) had the most moderate cold air,up to 10.8times.(5)The occurrence of cold air in different grades has a strong seasonality. The frequency of medium and strong cold air grades was the highest in summer,accounting for 30.1% and 57.9%respectively. In spring strong cold air was the highest,accounting for 40.1%,and the cold wave was the highest in winter,accounting for 38.9%.(6) The cold air in all grades has 8 to 10 ainterannual period that was not consistent,but the cold wave dramatically decreased obviously in 1979.
【Fund】: 中央级公益性科研院所基本科研业务费专项资金项目“北疆春季强冷空气过程次季节尺度预测技术研究”(IDM2016003) “新疆区域降温过程及极端低温事件的年、季定量评估研究及应用”(IDM201502)联合资助
【CateGory Index】: P423
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