Characteristics of regional high temperature and drought in China from April to June 2024 and their influence factors
Under the severe situation of global warming,regional high temperature and drought events are becoming more frequent,posing a major threat to ecological environment,food security,economic development and life and health.From April to June 2024,high-temperature and drought events occurred again in North China,Northwest China,and Southwest China,causing significant losses in agricultural production.This study utilized various data to preliminarily analyze the characteristics and causes of the high-temperature and drought processes in above three regions.The results show that the drought in southwest China mainly occurred in April,while the drought in North China and Northwest China began to emerge in April,with the intensity gradually increasing and the range expanding from May to June.With the intensification of drought,the abnormal range of regional maximum temperature expanded significantly.The number of hot days in Northwest China reached a new record,and the highest temperature anomaly reached its peak in May,which was one month ahead of the most severe drought period(June)in this region.The high temperatures in southwest China and North China were close to historical extremes.Further analysis indicates that the drought in North China is mainly influenced by the circulation in the Pacific region,while high temperatures are mainly affected by the circulation in the low-latitude Pacific and the Western Pacific Warm Pool.The drought in Northwest China is mainly influenced by the Western Pacific Subtropical High and the Arc-tic Vortex in the Northern Hemisphere,and the main influence on high temperatures comes from the North Atlantic.The factors affect-ing high temperatures and drought in the Southwest China are more complex,but mainly concentrated in the Northern Hemisphere Sub-tropical High and the low-latitude Pacific and Indian Oceans.From the perspective of circulation and water vapor,the main causes of the drought in North China and Northwest China are the development and maintenance of the continental high pressure,while the drought process in Southwest China is affected by the northward shift of the Western Pacific Subtropical High,which allows the dry and hot air currents from the Indian subcontinent to control this area,leading to water vapor divergence and ultimately causing high-temperature drought.
spring and summer in 2024heatwave and droughtclimate indicescirculation anomalies
万方数据
维普
