Stage Characteristics and Circulation Evolution of the High Temperature in the Summer of 2023 in Xinjiang
Against the backdrop of climate warming,the summer of 2023 witnessed unprecedentedly high temperatures in Xinjiang.The average temperature anomaly ranked highest since 1961,alongside the highest number of scorching days and high temperature days durations in recorded history.The coverage area of high temperatures was also the widest.In light of the stage and extreme characteristics of this high temperature,this study analyzed extreme features and the evolution law of the middle and high levels of the troposphere in different stages using data from 105 national meteorological stations in Xinjiang and NCEP/NCAR reanalysis data.Results revealed an eastern and northerly 100 hPa circulation field of the South Asian high,with intensified intensity.Additionally,the 500 hPa circulation field of the Iranian deputy high minister continued to strengthen and extend eastward,while the West Pacific subtropical high intensified and expanded westward and northward,with stronger anomalies.These systems cooperated,fostering a stable positive pressure structure conducive to high temperatures and their long-term maintenance.Analysis of circulation characteristics during extreme high temperature process highlighted the close relationship between regional extreme high temperatures in Xinjiang and the South Asian high-pressure system,particularly with significant positive correlation with the center latitude position.When the main body of the South Asian high pressure in the 100 hPa circulation field is between 55°-90°E and the center area is large,the northward position of the center is conducive to the occurrence of regional extreme high temperature process in Xinjiang.
high temperaturestage changeSouth Asian highIranian deputy high ministerWestern Pacific subtropical high
万方数据
维普
