CAJ | 학술논문

利用常规气象观测资料、NCEP 1°×1°逐6 h全球格点资料以及区域自动站降水资料、FY-2E卫星云图与多普勒天气雷达拼图资料，分析2013年第6号热带气旋(TC)“温比亚”在广西造成的非对称降水的环境场特征。结果表明，受副热带高压西南侧稳定而深厚的东南气流引导“，温比亚”西北行深入到广西中部，有利于广西出现较大范围暴雨。200 hPa上TC流出气流的中心偏于其中心的南侧，为降水不对称分布提供了动力背景；TC风场分布明显不对称，导致涡度、散度动力场结构呈不对称分布；低层辐合区主要分布在TC中心南侧，整层水汽通量辐合中心位于TC中心南侧，从而使暴雨集中在TC中心南侧。环境风垂直切变矢量指向TC移动路径的左侧，有利于TC移动路径左侧出现强的对流及降水，结合水汽辐合条件，可将其作为TC暴雨落区预报的一个判据。相对湿度(RH)呈均匀分布，假相当位温(θse)呈准对称分布，表明TC降水的非对称分布主要由动力因子而非热力因子引起。
이용상규기상관측자료、NCEP 1°×1°축6 h전구격점자료이급구역자동참강수자료、FY-2E위성운도여다보륵천기뢰체병도자료，분석2013년제6호열대기선(TC)“온비아”재엄서조성적비대칭강수적배경장특정。결과표명，수부열대고압서남측은정이심후적동남기류인도“，온비아”서북행심입도엄서중부，유리우엄서출현교대범위폭우。200 hPa상TC류출기류적중심편우기중심적남측，위강수불대칭분포제공료동력배경；TC풍장분포명현불대칭，도치와도、산도동력장결구정불대칭분포；저층복합구주요분포재TC중심남측，정층수기통량복합중심위우TC중심남측，종이사폭우집중재TC중심남측。배경풍수직절변시량지향TC이동로경적좌측，유리우TC이동로경좌측출현강적대류급강수，결합수기복합조건，가장기작위TC폭우락구예보적일개판거。상대습도(RH)정균균분포，가상당위온(θse)정준대칭분포，표명TC강수적비대칭분포주요유동력인자이비열력인자인기。
Using data from conventional meteorological observations, NCEP 6-hourly global reanalysis with resolution 1°×1°, rainfall ob-servations from automatic weather stations, FY-2E satellite cloud images and regional mosaics of Doppler weather radars, we analyzed char-acteristics of environment fields of asymmetrical precipitation in Guangxi induced by tropical cyclone (TC) Rumbia (1306). It is concluded that Rumbia moved northwestward and reached in central Guangxi under steering of stable and deep southeasterly airflow in the southwest side of subtropical high over the west Pacific, which is favorable to the occurrence of large-scale heavy rain in Guangxi. The center of outward airflow at 200 hPa tilting to the south side of TC provides dynamical condition for the asymmetrical precipitation of Rumbia. The clear asym-metrical wind field of TC causes asymmetrical vorticity and divergence fields. The distribution of heavy rain locating in the south side of TC is corresponding with the convergence zone in the low-level and the convergence center of water vapor flux in the whole layer in the same loca-tion. Wind vertical shear pointing to the left of the moving path of TC is advantageous to the strong convection and rain occurring in the same side, which is regarded as one of the criteria predicting rainfall distribution associated with tropical cyclones, along with water vapor conver-gence. The facts that the relative humidity is fairly well-distributed and the pseudo-equivalent potential temperature field is quasi-symmetry indicate that the asymmetrical precipitation of Rumbia is not mainly attributed to thermodynamic but dynamical factors.