CAJ | 학술논문

利用热带测雨计划任务卫星(TRMM)的测雨雷达(PR)、闪电成像仪(LIS)和微波辐射计(TMI)资料,研究了2005年5月6日发生在我国华南的一次强飑线过程的闪电活动及其与降水结构之间的关系.结果表明,该飑线系统中对流降水面积仅为层云的一半,但是总降水率却远大于层云的总降水率.绝大多数闪电发生在对流区,有少数闪电出现在层云区域.在6 km高度上,闪电发生附近的最大雷达反射率因子主要集中在35～50dBZ区间,峰值频数在40～45 dBZ,35 dBZ以下较少.研究还表明,对流单体的最大雷达反射率垂直廓线可以很好地指示单体的闪电频数和对流发展强度.对闪电与微波亮温的研究表明,大多数闪电发生在低亮温区域,特别是低于200 K亮温区,而在240～260 K的区域也可观测到少量闪电,这一般对应于飑线的层云区域.结合2003年4月17日黄淮地区的另一次强飑线系统的进一步研究发现,在单体尺度上,总闪电频数和冰相降水含量之间表现出非常密切而稳定的关系,相关系数达0.92.总闪电频数和冰相降水含量之间的稳定关系在中尺度数值模式中闪电资料的同化和飑线系统的闪电参数化研究中均有较大的应用潜力.
이용열대측우계화임무위성(TRMM)적측우뢰체(PR)、섬전성상의(LIS)화미파복사계(TMI)자료,연구료2005년5월6일발생재아국화남적일차강박선과정적섬전활동급기여강수결구지간적관계.결과표명,해박선계통중대류강수면적부위층운적일반,단시총강수솔각원대우층운적총강수솔.절대다수섬전발생재대류구,유소수섬전출현재층운구역.재6 km고도상,섬전발생부근적최대뢰체반사솔인자주요집중재35～50dBZ구간,봉치빈수재40～45 dBZ,35 dBZ이하교소.연구환표명,대류단체적최대뢰체반사솔수직곽선가이흔호지지시단체적섬전빈수화대류발전강도.대섬전여미파량온적연구표명,대다수섬전발생재저량온구역,특별시저우200 K량온구,이재240～260 K적구역야가관측도소량섬전,저일반대응우박선적층운구역.결합2003년4월17일황회지구적령일차강박선계통적진일보연구발현,재단체척도상,총섬전빈수화빙상강수함량지간표현출비상밀절이은정적관계,상관계수체0.92.총섬전빈수화빙상강수함량지간적은정관계재중척도수치모식중섬전자료적동화화박선계통적섬전삼수화연구중균유교대적응용잠력.
The data from precipitation radar(PR),lightning imaging sensor(LIS),and passive microwave imaging (TMI)onboard the Tropical Rainfall Measuring Mission(TRMM)satellite have been used to investigate lightning activity and its relationship with precipitation structure of a strong squall line over south China on May 6,2005.The results show that convective rains only occupied half of the area of stratiform rains,but the former contributed much more rainfall to the total than the latter.Most lightning flashes occur near the strong convective region,and a few flashes occur in the stratiform region of the squall line.At 6-km altitude,most of lightning flashes occur in the echo region between 35 and 50 dBZ,which peak during 40-45 dBZ,and fewer flashes can be seen in the echo region with reflectivity smaller than 30 dBZ.The results also indicate that the vertical profile of the maximum radar reflectivity has capability to reveal flash rate and vertical development of convective cells.Furthermore,it is found that most of lightning flashes occur in the region of low brightness temperature,especially the region lower than 200 K,and a few flash can also be seen in the region of 240-260 K,which usually corresponds to the stratiform region of squall lines.A combined study with another squall line over the Huanghe River-Huaihe River area on April 17,2003 shows that there is a close relationship between flash rate and ice precipitation content between 7-11 km altitude at a convective cell scale,and the correlation coefficient is 0.92,which suggest that the stable relationship between flash rate and ice precipitation content can be valuable in the study of both the assimilation of lightning data into mesoscale models and lightning flash parameterizations of squall lines.