基于ETCCDI指数的1991-2021年辽宁省极端降水和气温特征分析OACSTPCD

Daily temperature and precipitation data from 60 stations in Liaoning province from 1991 to 2021 were used to calculate 26 extreme climate indices defined by the Expert Team on Climate Change Detection and Indices(ETCCDI).The changes in extreme climate events over the past 30 years and the characteristics of extreme pre-cipitation and temperature in 2021 in Liaoning province were analyzed.The results showed that the average intensi-ty of single extreme cold(warm)events in Liaoning province has increased,but their frequency has decreased,and the frequency of persistent extreme events has also decreased.The number of low-temperature days has de-creased.The length of the growing season has increased,and the indices of warm nights and summer days have in-creased.Extreme precipitation amounts showed significant decadal variations from decrease to increase.In 2021,both extreme cold and warm events in Liaoning province were colder than normal,with extreme cold events being consistently colder across the province,while warm events were colder in western Liaoning province and warmer in the east.The growing season in 2021 was longer than in previous years.Total precipitation and extreme precipitati-on events were both above average,with prolonged wet periods and shortened dry spells.