一次高温天气过程分析

A High Temperature Weather Process Analysis

利用高空和地面观测资料分析了2011年6月7-8日焦作地区高温期间的环流形势特征,并对涡度场和垂直速度场进行了诊断分析。结果表明:高空稳定的西北气流造成的下沉运动是形成此次高温的主要原因,大气的干燥程度也是影响温度升高的原因;高空图上河套地区强盛暖脊,地面上暖低压形势,高空较强的暖平流是本次高温天气出现的有利条件;高空到近地面层深厚的负涡度系统对应的反气旋所伴随的整层持续下沉气流产生的绝热增温和晴空区辐射增温是这次高温天气形成的重要因素。此外气流沿太行山山坡下滑所产生的下沉增温效应对高温的产生起到了增幅作用。

By using the high altitude and the ground observation data, the paper analyzes the high temperature circulation characteristics of Jiaozuo area on June 7-8, 2011, and diagnostic analyzes vortic ity field and vertical velocity field. The results show that： the sinking movement caused by high altitude stable north western current is the main reason of the process formation, atmospheric dry degree has strong influence on temperature rise. Hetao area strong warm ridge, warm low pressure situation, high al- titude strong warm weather is the high temperature favorable conditions. The deep negative vorticity sys tem from high altitude to surface ground is corresponded the anticyclone. The anticyclone is incidental to the continued sinking airflow, which produces adiabatic raising temperature and clear skies area radiation raising temperature, and they are the important factors of the high temperature formation. Besides, the sinking raising temperature effect produced by the air along the Taihang mountain slope slide has increase effect for the generation of high temperature.