Analysis of Space-Time Characteristics of the Summer Precipitation Changes in Weifang City

Abstract

为了进一步掌握潍坊市降水的时空分布及变化特征，合理利用降水资源，更好地为潍坊市抗旱防汛和防灾减灾工作提供决策依据。本文利用1960~2019年潍坊市9个气象站的降水观测资料，采用线性趋势分析和Mann-Kendall等气候学诊断方法，对潍坊市近60年来夏季和各月降水量的时空变化特征及夏季降水量的气候突变特征进行了分析。结果表明：潍坊市夏季降水总体呈减少的趋势，各月降水距平波动幅度变化较大，6月份波动幅度最大，8月份最小。夏季及6、7月份平均降水距平和线性变化均呈不显著下降趋势，8月份降水呈不显著上升趋势。潍坊市夏季平均降水自北向南依次减小，各区域降水量皆呈线性减少趋势，其中南部减少最多，北部次之，中西部最小。潍坊市夏季各月平均降水均未发生突变。 This paper aims to use rationally the precipitation resources and therefore better serve the decision making for drought and flood control and disaster prevention and mitigation work in Weifang City by understanding the space-time distribution and the characteristics of the city’s precipitation changes. Based on the observation data on the precipitation of 9 meteorological stations in Weifang City from 1960 to 2019, this paper analyzes the space-time characteristics on the summer and monthly precipitation changes and the abrupt change of climate of summer precipitation in Wei-fang City in recent 60 years by using linear trend analysis and Mann-Kendall climatological diagnosis method. The results show that: the summer precipitation in Weifang City presented a trend of decrease and the departure of the monthly precipitation fluctuates greatly, with the largest fluctuation in June and the smallest in August. The average departure of precipitation and linear change in summer, especially in June and July, presented the trend of no significant decrease, while the precipitation in August presented the trend of no significant increase. The average summer precipitation of Weifang City decreases from north to south, and the precipitation of each region presented a trend of linear decrease, in which the southern part decreases the most, followed by the northern part and the central and western part. There was no abrupt change in the average summer monthly precipitation in the city of Weifang.