陕西太白山夏季降水日变化特征研究

Study on Diurnal Variation Characteristics of Summer Precipitation in Taibai Mountain, Shaanxi Province

摘要: 基于2018~2021年太白山气象站逐时降水观测资料，以降水量、降水频次以及降水强度作为研究指标，对该区夏季降水日变化特征进行分析研究。结果表明，年降水量和降水频次均呈现明显的单峰结构，峰值均出现在2022年。降水量主要集中在2:00~4:00、6:00~12:00，18:00~21:00，且最大值出现在2020年10:00，为42.3 mm。高降水频次主要集中在2019~2021年的3:00~12:00，最高为20次。白天降水总量和降水频次分别占到全天的52%和48%，多年不同降水强度的出现频次呈脉冲变化，且年内变化均为小雨 > 中雨 > 大雨 > 暴雨，未曾出现大暴雨和特大暴雨。

Abstract: Based on the hourly precipitation observation data of Taibai mountain meteorological station from 2018 to 2021, the daily variation characteristics of summer precipitation in this area were analyzed and studied by taking precipitation, precipitation frequency and precipitation intensity as research indicators. The results show that the annual precipitation and precipitation frequency show obvious unimodal structure, and the peak occurred in 2022. Precipitation is mainly concentrated in 2:00~4:00, 6:00~12:00, 18:00~21:00, and the maximum occurred at 10:00 in 2020, which was 42.3 mm. The frequency of high precipitation is mainly concentrated in 3:00~12:00 in 2019~2021, with a maximum of 20 times. The total amount of precipitation and the frequency of precipitation during the day accounted for 52% and 48% of the whole day, respectively, and the frequency of different precipitation intensities over the years showed pulse changes, and the changes during the year were light rain > moderate rain > heavy rain > torrential rain, with no heavy rainstorms and exceptionally heavy rainstorms.