Climatic Characteristics and Causes of High-Temperature and Drought Events in Huangshan Region During 1962-2022
Using the daily meteorological observation data and Meteorological Drought Composite Index(MCI)data from 1962 to 2022,the regional high temperature and drought events of Huangshan region in Anhui province were identified by a regional weather process identification method.Based on this identification,the climatic characteristics,comprehensive strength and cause analysis of the events were analyzed.The results showed that the high-temperature days in Huangshan region exhibited an increasing trend over time,with the spatial distribution characteristics of a higher prevalence in flat and hilly areas compared to mountainous regions at higher altitudes.The drought days varied significantly over time,with a spatial distribution pattern of more drought days in the southern regions and fewer in the northern regions.The frequency of regional high-temperature e-vents showed an increasing trend,while the trend of regional drought events was not significant.However,the characteristics of drought and flood alternation had become apparent since 2008.After the 21st century,the occurrence frequency of high-tem-perature and drought events increased and the interval shortened.Specifically,the combined intensity of the high-temperature and drought events in 2022 ranked second in historical records,which had a significant impact on society.Under the back-ground of global warming,the subtropical high ridge line was northward and strong,which blocked the convergence of cold and warm airflow,leading to the occurrence of abnormal high-temperature and drought events in Huangshan region.
high-temperature and droughtregional climatic eventsclimatic characteristicscause analysismountainous re-gions
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