CAJ | 학술논문

通过台风登陆前的探空、多普勒雷达资料以及数值模拟,对0709号台风"圣帕"登陆前龙卷发生的环境背景、发生、发展和消亡的过程特点进行了分析.从周围环境场分析表明,龙卷发生地处于高的能量不稳定区并且具有非常低的抬升凝结高度和较强的低层垂直风切变,利于龙卷生成.雷达分析显示龙卷发生前存在弱的中气旋和低层气旋式切变,龙卷发生时伴随着这两个弱涡旋的合并增强,这可能是爆发龙卷的重要原因之一.数值模拟能较好地模拟出在龙卷发生时该区域有较强的风切变和水汽通量的辐合,并且螺旋度和风暴相对螺旋度有瞬时的强烈变化.
통과태풍등륙전적탐공、다보륵뢰체자료이급수치모의,대0709호태풍"골파"등륙전룡권발생적배경배경、발생、발전화소망적과정특점진행료분석.종주위배경장분석표명,룡권발생지처우고적능량불은정구병차구유비상저적태승응결고도화교강적저층수직풍절변,리우룡권생성.뢰체분석현시룡권발생전존재약적중기선화저층기선식절변,룡권발생시반수착저량개약와선적합병증강,저가능시폭발룡권적중요원인지일.수치모의능교호지모의출재룡권발생시해구역유교강적풍절변화수기통량적복합,병차라선도화풍폭상대라선도유순시적강렬변화.
A tornado occurred in Wenzhou Longgang village before the landing of typhoon "SEPAT". The character of circulation background and process of its lifecycle were studied, using sounding, radar data, as well as numerical simulation. According to the synoptic background, the air of the region where tornado occurs was very unstable and bore with strong low level wind shear. According to Radar data, there had been weak meso-scale cyclone and weak low level wind shear, before tornado broke out. We also find two cyclones merged and became stronger when the tornado formed, which may be one of the important cause of the tornado. By numerical simulation we find strong low level wind shear and water vapor convergence, and environmental helicity and storm relative environmental helicity changed abruptly when tomado occurred.