CAJ | 학술논문

2007年7月9日16-20时（北京时）在河北南部非常罕见地观测到了多个超级单体风暴在相近地点连续生成及分裂的过程。利用石家庄新乐SA型多普勒天气雷达资料、地面自动站及常规天气资料，对超级单体分裂过程及环境条件做了分析。表明这次的多个超级单体风暴是在强的对流有效位能和垂直风切变的环境条件下发生的。由于垂直风切变矢量方向随高度逆时针旋转，因此，分裂后左移的反气旋风暴得到加强，发展成为具有深厚中反气旋的左移超级单体风暴，而右移的气旋性风暴受到抑制，与理论研究结果一致。但也有不同之处，沿着地面高湿区内热力边界偏暖一侧移动的气旋性风暴没有受到明显抑制，有利的地面环境条件抵消了气旋性风暴受抑制的程度，使气旋性风暴能够持续更长的时间。该强烈发展的带有明显中反气旋的超级单体风暴具有低层钩状回波和入流缺口、中高层有界弱回波区及位于有界弱回波区之上的高层具有反射率因子核心和强烈风暴顶辐散，与经典的气旋式右移超级单体风暴的回波特征非常类似，除了是反气旋涡旋外，其回波特征与气旋式超级单体近似成镜像。风暴分裂是在单体形成不久的发展初期开始的。分裂先从中高层开始，然后迅速向下延伸。分裂后相对于0-6 km风切变矢量，左侧的单体为反气旋左移风暴，右侧的为气旋性右移风暴。
2007년7월9일16-20시（북경시）재하북남부비상한견지관측도료다개초급단체풍폭재상근지점련속생성급분렬적과정。이용석가장신악SA형다보륵천기뢰체자료、지면자동참급상규천기자료，대초급단체분렬과정급배경조건주료분석。표명저차적다개초급단체풍폭시재강적대류유효위능화수직풍절변적배경조건하발생적。유우수직풍절변시량방향수고도역시침선전，인차，분렬후좌이적반기선풍폭득도가강，발전성위구유심후중반기선적좌이초급단체풍폭，이우이적기선성풍폭수도억제，여이론연구결과일치。단야유불동지처，연착지면고습구내열력변계편난일측이동적기선성풍폭몰유수도명현억제，유리적지면배경조건저소료기선성풍폭수억제적정도，사기선성풍폭능구지속경장적시간。해강렬발전적대유명현중반기선적초급단체풍폭구유저층구상회파화입류결구、중고층유계약회파구급위우유계약회파구지상적고층구유반사솔인자핵심화강렬풍폭정복산，여경전적기선식우이초급단체풍폭적회파특정비상유사，제료시반기선와선외，기회파특정여기선식초급단체근사성경상。풍폭분렬시재단체형성불구적발전초기개시적。분렬선종중고층개시，연후신속향하연신。분렬후상대우0-6 km풍절변시량，좌측적단체위반기선좌이풍폭，우측적위기선성우이풍폭。
An infrequent process with several supercells generating and splitting at nearby places occurred on 9 July 2007 in the south of the Shijiazhuang region was observed.Based on the Doppler weather radar data from the Xinle station in the Shiji-azhuang region,automatic weather station data and conventional weather data,the splitting process and environmental condi-tions of the splitting supercell storms were analyzed.The results showed that this supercell storm developed under an environ-mental condition with high convective available potential energy (CAPE)and strong vertical wind shear.Because the direction of vertical wind shear vector rotated counterclockwise with height,after the splitting,the left-moving anticyclonic storms were strengthened and turn into a left-moving supercell storm with deep meso-anticyclone,while the right-moving cyclonic ones were restrained.These results resembled theoretical study.At the same time,it was not in accordance with the theoretical study in some aspects,which include that,the cyclonic storms moving along the warm side of thermal boundary of high humidity region were not obviously restrained.That was because advantageous surface environmental conditions offset resistance of the cyclonic vortices,which made them lasted longer.The intensely developed supercell storm with obvious meso-anticyclone had features as hook echo and inflow notch at the low level ,bounded weak echo region (BWER)at the middle-upper level and reflectivity core and strong storm top divergence at the upper level.These echo features were similar to classic cyclonic right-moving super-sell except with anticyclone and the echo feature being approximate mirror image of cyclonic supercell storm.Storm splitting began at the initial stage of the formation of cells.The splitting occurred at the middle-upper level at first and then extended downward rapidly.After the division,relative to the 0-6 km wind shear vector,the left cells were anticyclonic left-moving storms and the right ones were cyclonic right-moving storms.