基于TRMM/LIS资料的浙江省及周边地区闪电特征和气象要素分析

ANALYSIS OF LIGHTNING CHARACTERISTICS AND THEIR RELATIONSHIP WITH METEOROLOGICAL PARAMETERS IN ZHEJIANG AND ITS SURROUNDING AREAS BASED ON TRMM/LIS DATA

利用TRMM/LIS0.1°超高分辨率闪电定位产品,分析了浙江省及周边地区(117.5~123.0°E,26~32°N)卫星闪电资料的时空分布特点;并结合中国区域地面气象要素驱动数据集、亚洲大陆气溶胶光学厚度数据集,分析了该区域闪电与气象要素的关系。结果表明:研究区域内闪电平均密度为5.97f1/(km^(2)·a),其中陆地闪电平均密度为7.94f1/(km^(2)·a),海洋闪电平均密度为2.09f1/(km^(2)·a),陆地闪电平均密度为海洋闪电平均密度的3.80倍;平均闪电密度值逐月变化特征在陆地和海洋区域有很好的一致性,夏季闪电密度最大,冬季闪电密度值最小;陆地闪电密度日变化呈现单峰结构,海洋闪电密度日变化呈现双峰双谷波形。该区域陆地气温、地面辐射、比湿及降水率均与闪电密度的月变化成正相关,其中地面降水率和闪电密度月变化相关系数最高,为0.8580;气溶胶光学厚度与闪电密度月变化呈现弱的负相关,相关系数为-0.3978。

The characteristics of spatial and temporal distribution of satellite lightning data in Zhejiang and its surrounding areas(117.5~123.0°E,26~32°N)are analyzed based on the TRMM/LIS 0.1 Degree Very High Resolution Gridded Lightning Climatology Data Collection,and its relationship with meteorological parameters in this area are analyzed by combining the China Meteorological Forcing Dataset and SRAP AOD dataset of Asia.The result shows that the average lightning frequency in this area is 5.97 times/(km^(2)·a).The average lightning frequency on land and ocean is 7.94 times/(km^(2)·a)and 2.09 times/(km^(2)·a)respectively,with the former 2.80 times higher than the latter.Monthly variation trends of the average lightning frequency on land and sea are quite consistent.The maximum lightning frequency is in summer and the minimum is in winter.Diurnal variation of lightning frequency on land presents a single oscillation with a peak and a trough,while lightning frequency over sea shows a double oscillation with two peaks and two troughs.The monthly variation of land temperature,surface radiation,specific humidity and precipitation rate are positively correlated with that of lightning frequency.The correlation coefficient between precipitation rate and lightning frequency is 0.8580,which is the highest correlation coefficient between meteorological parameters and lightning frequency.The monthly variation of aerosol optical thickness has a weak negative correlation with lightning frequency,and the correlation coefficient is-0.3978.