廊坊市重污染天气大气环流形势及配置特征分析

Analysis of atmospheric circulation situation and allocation characteristics of heavily polluted weather in Langfang City

  • 摘要: 对2013—2015年廊坊市重污染天气发生当日08:00地面、高空环流形势实况资料进行分型统计,并对高、低空环流配置进行分析,结果表明:地面场共有8种类型,其中以高压场底部控制最多,高压场后部、变性高压场和高压场前部控制较多;轻微霾和重度霾时,地面均以高压场底部控制最多;轻度霾时以回流形势控制最多;中度霾时以高压场后部控制最多。700 hPa高空环流形势共有7种类型,以脊前西北气流控制最多,其次为平直西风环流和槽前西南气流;轻微霾和重度霾时,以脊前西北气流控制最多;轻度霾和中度霾以平直西风环流控制最多。高、低空环流配置共有9种类型,3种主要的配置形势为700 hPa高空为高压脊,地面为高压场;700 hPa高空为平直西风环流,地面为高压场;700 hPa高空为高空槽,地面为高压场。轻微霾和重度霾时均以700 hPa高空为高压脊,地面为高压场是最主要的配置类型,轻度霾和中度霾时均以700 hPa高空为平直西风环流,地面为高压场是最主要的配置类型。3~5 d持续重污染天气过程,地面以高压场底部控制最多,高空环流形势平直西风环流、高压脊、高空槽的占比分别为36.0%、35.2%和28.9%。高、低空环流配置则以700 hPa高空为高压脊,地面为高压场底部是最典型的配置类型。

     

    Abstract: The characteristics of surface weather pattern and high-altitude circulation pattern of heavily polluted weather at 08:00 were studied by using the data from 2013 to 2015 in Langfang City, and the configuration of high and low-altitude atmospheric circulation analyzed. The results showed that there were 8 types of surface weather circulation patterns, among which the bottom of high pressure accounted for the most, and the rear of high pressure, deformed high pressure and the front of high pressure appeared more. Whenever slight or severe haze occurred, the most surface weather circulation pattern was the bottom of high pressure, the backflow situation appeared the most in mild haze, while the rear of the high pressure field was the most in moderate haze. There were 7 types of 700 hPa circulation, with the northwest airflow before the ridge taking the largest proportion, followed by straight west airflow and southwest airflow before the trough. The slight haze and severe haze most controlled by the northwest airflow before the ridge, while the mild haze and moderate haze were dominated by the straight west wind. There were 9 types of high and low altitude atmospheric circulation configuration, with three main configuration situations being 700 hPa high-pressure ridge control with ground high-pressure field, 700 hPa straight west wind with ground high-pressure field, and 700 hPa high-air trough with ground high-pressure field. Whenever slight or severe haze occurred, the main configuration type was high-pressure ridge in 700 hPa with high-pressure field on surface. When mild haze and moderate haze occurred, the main configuration type was straight western airflow in 700 hPa with high-pressure field on surface. During 3-5 days of continuous haze process, high pressure bottom accounted for the most on the ground, and the proportion of the high altitude situation of the straight westerly circulation, ridge, high-altitude groove was 36.0%, 35.2% and 28.9%, respectively. The most typical circulation situation of high and low air configuration was controlled by high-pressure ridge at high altitude, and for the ground circulation the most typical situation was the bottom of high pressure.

     

/

返回文章
返回