1960-2022年鄂尔多斯市极端气候事件演变特征OA

In order to scientifically understand the climate change trends and characteristics of Ordos City under the background of global climate change,this study employs observational data from 11 meteorological stations across the city during 1960-2022,including daily cumulative precipitation,daily extreme temperature records,and dust weather indices.Climate tendency rates,extreme climate indices,and dust intensity indices were calculated to system-atically analyze the temporal evolution patterns of extreme climate events over the past 63 years.The results show that:The extreme temperature in Ordos City has shown a significant upward trend overall,and entered an accelerated warm-ing stage after the 21st century.The warming process of its climate has obvious asymmetry.Specifically,the increase in low-temperature extreme values is higher than that of high-temperature extreme values,the reduction rate of cold events is faster than the increase rate of warm events,and the sensitivity of extreme temperature at night is significantly stronger than that during the day.Except for the extremely heavy precipitation index,the precipitation extreme value in-dex and the consecutive dry and wet days index,all other extreme precipitation indices show an upward trend.This in-dicates the response characteristics of regional"warming and humidification"under the background of climate change.The indices that have decreased indicate that the duration and extreme intensity of single precipitation events in the lo-cal area have weakened.The dominant type of sandstorm in Ordos City is blowing sand,followed by dust and sand-storm.During the study period,the number of days of all three types of sandstorms showed a highly significant down-ward trend.The sandstorm intensity index also decreased significantly simultaneously.The average intensity in the past 20 years has dropped to less than 20%of the historical peak period.