Analysis on the climatic characteristics and change trend of rainstorm in Kunming in recent 70 years

Abstract

In order to more scientifically identify the characteristics and evolution rules of urban rainstorm under changing environment, and enhance the prevention and decision-making ability of urban response against flood disasters, daily precipitation data of Kunming National Reference Meteorological Station in 72 years(1951—2022) were used to study the evolution characteristics of rainstorm duration in Kunming during recent 70 years. Mann-Kendall test was used to analyze the variation trend and significance degree of precipitation, rainstorm amount, rainstorm days, rainstorm intensity in Kunming. At the same time, a variety of mathematical statistics method were used to verify the research conclusion. The result showed that in the past 70 years, the precipitation in Kunming had slightly decreased, the rainstorm volume had increased, the rainstorm days had increased, and the rainstorm intensity had increased. Light, moderate and heavy rain decreased, while rainstorm gradually increased. It was predicted that rainstorm would continue to increase and strengthen with the growth rate of 8.28 mm per decade in the future.

Keywords

climatic characteristics of rainstorm / characteristic variable of rainstorm / change trend / precipitation contribution