2017年7月张掖市持续高温天气成因分析
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摘要
利用实时观测资料和物理量诊断,对2017年7月10—17日出现在张掖地区的高温天气形成原因和物理机制进行了分析研究。结果表明,对流层上层的南亚高压和中层的大陆性高压是这次极端高温天气的高空主要影响系统,低层高原暖脊和地面热低压是近地面层的主要影响系统。南亚高压与大陆性高压相互叠加,形成上层辐合、低层辐散、伴随下沉运动的深厚反气旋暖高压系统,由其引起的晴空辐射增温和下沉绝热增温,以及由低层高原暖脊北抬和地面热低压东移造成的气温抬升,是这次极端高温天气形成的主要原因和物理机制。
The causes and physical mechanism of the hot weather in Zhangye area from July 10 to 17,2017 were analyzed using real-time observation data and physical quantity diagnosis. The results showed that the South Asian high pressure in upper troposphere and continental high pressure in middle troposphere were the main impact systems at high altitude in this extremely hot weather,the lower plateau warm ridges and the ground heat low were the main impact systems in the ground layer. The South Asian high pressure and continental high pressure were superimposed,forming deep anti cyclone warm high pressure system with upper convergence,lower divergence and subsidence movements.The clear-sky radiation increase and adiabatic increase in temperature caused by the deep anti cyclone warm high pressure system,the rise in temperature caused by the northward rise of the lower plateau warm ridges and the eastward shift of the ground heat low pressure was the main reason and the physical mechanism for the formation of this extremely hot weather.
The causes and physical mechanism of the hot weather in Zhangye area from July 10 to 17,2017 were analyzed using real-time observation data and physical quantity diagnosis. The results showed that the South Asian high pressure in upper troposphere and continental high pressure in middle troposphere were the main impact systems at high altitude in this extremely hot weather,the lower plateau warm ridges and the ground heat low were the main impact systems in the ground layer. The South Asian high pressure and continental high pressure were superimposed,forming deep anti cyclone warm high pressure system with upper convergence,lower divergence and subsidence movements.The clear-sky radiation increase and adiabatic increase in temperature caused by the deep anti cyclone warm high pressure system,the rise in temperature caused by the northward rise of the lower plateau warm ridges and the eastward shift of the ground heat low pressure was the main reason and the physical mechanism for the formation of this extremely hot weather.
引文
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