1973—2021年南京地区不同等级降水时空变化特征

Spatial and Temporal Variation Characteristics of Precipitation at Different Levels in Nanjing Region from 1973 to 2021

本文采用气候倾向率、M-K检验及反距离权重插值等方法,针对南京地区7个雨量站1973—2021年逐日降水资料,以降水量、降水天数和降水强度3个变量为主要研究对象,分析得到南京地区不同等级降水时空变化特征。结果表明,近50年来,南京地区暴雨量及暴雨天数显著增加,小雨天数显著减少,年降水强度显著增强,不同等级降水量、降水天数、降水强度基本呈现南多北少分布特征。该成果可为南京市旱涝防御决策提供依据。

In this paper,methods such as climate tendency rate analysis,Mann-Kendall test,and inverse distance weighting interpolation are employed to analyze daily precipitation data from seven rainfall stations in Nanjing region from 1973 to 2021.The study focuses on three variables:precipitation amount,number of precipitation days,and precipitation intensity,to investigate the spatial and temporal variation characteristics of different levels of precipitation in Nanjing region.The results indicate that over the past 50 years,there has been a significant increase in heavy rainfall amount and the number of heavy rainfall days,while the number of light rainfall days has significantly decreased.The annual precipitation intensity has also shown a significant enhancement.Different levels of precipitation,precipitation days,and precipitation intensity exhibit a spatial distribution pattern with more precipitation in the south and less in the north.These findings can serve as a basis for decision-making in drought and flood prevention strategies in Nanjing City.