Subjects: Geosciences >> Atmospheric Sciences submitted time 2023-03-13 Cooperative journals: 《干旱区研究》
Abstract： Based on the observation data of daily precipitation and temperature elements in winter from 1978 to 2020 from 17 national meteorological stations, the spatial- temporal variation characteristics of winter snowfall and its relationship with meteorological factors in the economic belt on the north slope of the middle Tianshan Mountains were analyzed by using various statistical methods. The results show that: The regional distribution of snowfall days and snowfall amount is similar, showing the distribution characteristics of‘more urban areas, less mountainous areas’. The decrease of light snow days is the direct reason for the decrease of total snow days, while the significant increase of moderate snow and blizzard is the main reason for the increase of total snowfall. The precipitation process lasting for 1 day is the main snowfall process in winter. With the increase of the duration, the precipitation process decreases significantly, and the precipitation process ≥ 5 days only accounts for 2.8%; In the past 43 years, the climate on the north slope of Tianshan Mountains has shown an obvious warming and humidifying trend. In 1987 and 1994, the amount of snowfall changed from less to more and the average temperature changed from lower to higher; The amount of snowfall is significantly and positively correlated with the annual precipitation, the average minimum temperature in winter, and the number of snowfall days. The greater the annual precipitation, the lower the minimum temperature in winter, and the more snowfall days, the greater the amount of snowfall in winter, and vice versa.
Subjects: Geosciences >> Atmospheric Sciences submitted time 2021-10-10 Cooperative journals: 《干旱区地理》
Abstract： 利用 2012—2019 年乌鲁木齐市 6 个国家级气象站夏季逐时降水资料，分析全市和不同区域 近 8 a 逐时降水日变化特征。结果表明：（1）近 8 a 乌鲁木齐市夏季不同量级降水量和降水日数空 间分布总体是由山区向郊区减小，一般性降水对总降水贡献最大。（2）全市和各区域逐时累计降水 量和降水频次变化趋势较显著，增加速率明显大于下降速率，山区明显高于城区和郊区。（3）全市 与山区降水量峰值均出现在 16:00—00:00，城区在 00:00—04:00，郊区在 02:00—07:00；降水频次峰 值出现时间有一定差异，最易发生降水的时段大都在夜间；降水强度日变化与降水量和降水频次 存在一定差异，山区最大值出现在 17:00，城区在 20:00，郊区在 16:00。（4）全市和各区域降水主要以 短历时降水为主，持续 1 h 降水次数出现最多，对总降水频次贡献最大；全市和山区持续 2 h 降水量 最多，城区持续 3 h 和郊区持续 6 h 的降水量最多；全市持续 1～6 h 的降水量占总降水量的 60.7%， 且以夜雨、短历时降水为主。
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