基于L波段雷达探空资料的重庆市区低空逆温特征分析

Characteristic Analysis of Temperature Inversion in Lower-Level Atmosphere over Chongqing Based on L-Band Radar Data

利用重庆市沙坪坝气象站2005—2009年L波段雷达探空观测资料,研究重庆市区接地逆温和悬浮逆温的出现频率、逆温厚度、垂直分布特征和强度状况,对本地低空大气的逆温分布特征进行了详细分析。分析结果表明:重庆市区低空大气全年均不同程度存在逆温层,低空逆温出现频率为93%,夏季发生的频率最高,冬季最低;逆温强度总体不大,07:00和19:00接地逆温多年平均强度分别为0.53℃/hm和0.6℃/hm,为同时段悬浮逆温强度的2倍;从垂直分布特征来看,低空逆温呈现厚度薄且层次多的特点,层次最多时达6层。

In order to analyze the variation of the temperature inversion layer in the lower atmosphere over Chongqing, the daily L-band radar data set in the period of 2005 to 2009 in Shapingba Weather Station is used. The frequency, intensity, thickness, and distribution of temperature inversion are analyzed in detail. The results reveal that there existed temperature inversion in the lower atmosphere over Chongqing in most days of a year, up to 93℃, most frequent in summer and rarely in winter; the overall intensity of is modest, with the average intensity of touchdown inversion at 07：00 and 19：00 being 0.53 ℃/hm and 0.6 ℃/hm, respectively, which are two times as much as those of suspension inversion at the same time. In respect of the characteristics in the vertical distribution, the lower-level temperature inversion layers are relatively thin and divided into many layers, sometimes up to 6 layers.