Spatial and temporal variations of precipitation events with different durations during the warm season in Tianjin
YANG Yanjuan
YANG Jin
REN Jianling
Abstract：Different precipitation events are divided into short-duration,medium-duration,long-duration and persistent precipitation at 2-h intervals by minute precipitation data of 12 national meteorological stations in Tianjin during the warm season(from May to September)of 1979-2020.The spatial and temporal variation characteristics of precipitation,intensity and frequency of the precipitation events with different durations are analyzed.The results are shown below.(1)Temporally,the variations of precipitation,precipitation frequency and ratio are consistent,short-and medium-duration precipitation events show an increasing trend,and long-duration and persistent precipitation events show a decreasing trend.The precipitation intensity increases in each duration.(2)The time range of high precipitation and intensity of short-and medium-duration precipitation events has expanded from the traditional"late July-early August"to"mid-June-late August",while that of long-duration and persistent precipitation events has become more concentrated.(3)There are different spatial characteristics and trends in precipitation and intensity.The change in precipitation is mainly reflected in the increase of short-duration precipitation and the decrease of persistent precipitation,corresponding to the increase in precipitation intensity.This change is particularly significant in urban districts and their surrounding areas as well as in Binhai New area,which may be related to the changes in the urban thermal environment caused by urbanization.
Keywords：precipitation intensityprecipitation eventwarm season
Publication Date：2025-10-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：13( 111-123 )