摘要
利用FY2-C、FY2-D高时空分辨率可见光云图和FY2-C云顶亮温资料,选取了2007年6月24—25日和7月10—11日2次强雷电过程,对雷电时空分布与强雷暴云团(MCS)演变特征的相关性进行了分析。结果表明:(1)对于不同MCS来说,落雷次数和落雷密度都与MCS的强度密切相关,即MCS强度越大,对流越强,落雷次数越多,落雷密度越大。(2)落雷集中的时段主要都出现在MCS成熟之前、水平尺度为中β尺度的时段内。(3)对于同一MCS来说,在MCS成熟之前,当前以及未来1h的落雷密集区都不是位于当前大范围较低亮温区所覆盖的区域,而是位于MCS移动方向前方和最低云顶亮温中心前方TBB梯度最大的区域内,未来1h的落雷密集区比当前的落雷密集区偏东30—50km。在MCS成熟之后,落雷密集区位于MCS主体外新生的尺度小、生命史短的雷暴云团附近TBB的密集区内。
Based on the high spatio-temporal resolution visible cloud images of FY2-C and FY2-D meteorological satellites and the TBB of FY2-C meteorological satellite, two severe lightning processes during June 24--25 and July 10--11, 2007 were selected to analyze the correlation between the spatio-temporal distribution of severe lightning and the evolutional characteristics of MCS. The results show that ： （ 1 ） For different MCSs, the numbers and densities of lightning strike are both closely related to the intensity of MCSs, which means that the stronger the intensity of MCS is, the stronger the convectional intensity is, and hence the more the number of the lightning strike is, and the higher the lightning density is. （2） The lightning strikes mainly occur before the mature stage of MCS with theβ-scale. （3） Before the mature stage of MCS, the intensive areas of lightning strikes at current time and in the next one hour are not located at the area of large-scale lower TBB region, but at the highest gradient area of the TBB which is in front of the MCS＇s movement direction and the core of TBB, and the intensive area of lightning strike in the next one hour is 30 to 50 km east to that at current time. After the mature stage of MCS, the intensive area of lightning strike is located at the intensive area of TBB near the newborn small-scale and short-lifecycle thunderstorm outside the MCS.
出处
《气象与减灾研究》
2009年第3期31-35,共5页
Meteorology and Disaster Reduction Research
基金
中国气象局新技术推广项目(编号:CMATG2006710)
江西省科技厅项目"江西突发性强对流天气监测和预警研究"
关键词
雷电分布
强对流云
演变
相关性
Spatio-temporal distribution of lightning, Strong thunderstorm cloud, Evolution, Correlation.
