新疆阿勒泰地区夏季降水日变化的时空分布特征

Temporal and spatial distributions of the diurnal cycle of summer precipitation in Altay of Xinjiang

摘要:

基于2011—2020 年夏季（6—8 月）阿勒泰地区8个国家气象站逐小时降水数据，讨论降水特征量日变化的时空分布特征。结果显示：总降水量和总降水强度峰值都发生在16—19 时，均呈现出白天整体增强的特征，总降水频次与之相反。总降水特征量的谷值整体都出现在23 时—次日02 时。白天（09—20 时）降水多于夜间（21—08 时），微雨降水频次最多。持续2 h的降水量最多，对总降水量的贡献最大，持续1 h的降水频次最多，持续时间与降水频次负相关。总降水量最大值存在“西多东少，北多南少”的空间分布，3 种不同等级降水总体表现为由沿山区和山麓丘陵区向河谷平原区减少的特征，3 种不同持续时间降水存在区域差异主要是由持续时间为1~6 h的短历时降水贡献。

Abstract:

Based on the summer (June to August) hourly precipitation data covering 8 meteorological stations in Altay region during 2011-2020. The spatial and temporal distribution characteristics of diurnal variation of precipitation characteristics are discussed, The main conclusions are as follows: The peak values of total precipitation amount and total precipitation intensity occur from 16:00 to 19:00 Beijing time, The amount and intensity of total precipitation shows an increasing trend in day (09:00-20:00), while the total precipitation frequency is opposite. and the valley values of total precipitation characteristics occur from 23:00 to 02:00 of the next day. The precipitation main occur in day and the drizzle is more frequent than other levels. precipitation lasting for two hours contributed the maximum precipitation amount to the total precipitation, precipitation lasting for one hours occurred most and the duration is negatively correlated with precipitation frequency. There is a spatial distribution of the total precipitation maximum that is "the west is more than l the east, the north more than the south", the three different precipitation categories events generally show a decreasing trend from the mountainous areas and foothills to river valley plain, the three different durations precipitation events mainly are contributed by short-term precipitation with duration of one to six hours.