1971-2024年陕西省区域性高温过程的时空特征OA

Based on the daily maximum temperature data from 95 national meteorological stations of Shaanxi Province from 1971 to 2024,the regional high temperature process(RHTP)in Shaanxi Province is identified ob-jectively,following the operational method adopted by the Shaanxi Climate Center.Subsequently,the spatiotem-poral characteristics are investigated by using methods such as linear trend estimation,correlation coefficients,moving averages,and the Mann-Kendall test.The following conclusions are drawn:high temperature events in Shaanxi Province are primarily concentrated in the central-eastern Guanzhong Plain and the Ankang River Valley of southern Shaanxi.Both the frequency and strength of high temperature events in Shaanxi Province are general-ly higher in the south and east and lower in the north and west.The RHTP occur with an annual average frequen-cy of four times,predominantly between mid-June and mid-August.For each process,the mean duration reaches 4 days,and the average intensity typically ranges between 36℃and 37℃.Against the backdrop of global cli-mate warming,both the frequency and strength of high temperature events in Shaanxi Province have increased over the past 54 years.The RHTP in Shaanxi Province have exhibited pronounced climate change characteristics during this period.These include increased frequency,enhanced intensity,prolonged duration,expanded spatial coverage,advanced onset,delayed termination,and strengthened comprehensive intensity.These changing char-acteristics initially emerged in the late 1990s and have become particularly pronounced since the beginning of the 21st century.