CAJ | 학술논문

提利用NCEP再分析资料，根据水汽收支方程计算2012年7月21日北京特大暴雨时期华北东北部暴雨区域的水汽收支情况并分析水汽输送特征。得到以下结论：经向水汽输送在此次暴雨过程中起主要作用，暴雨区内水汽主要来源于中、低层（500 hPa以下）的南边界。暴雨区内水汽的辐合与暴雨发生的时间和空间具有较好一致性，在低层水汽的辐合起主要作用，中高层水汽垂直输送作用更为显著。HYSPLIT后向轨迹模拟得到的结果显示根据水汽源地划分影响此次暴雨过程水汽输送路径主要有：从孟加拉湾、南海地区处于中低层直接北上的西南路径，以及中层以下从我国东部海域（黄海、东海为主）进入内陆之后北折向东北偏北方向运动的L形高湿路径；同时高层沿着西风带西北路径的干空气输送也对此次强降水有重要影响。三者中从东部海域到达暴雨区的水汽贡献率最大，而孟加拉湾、南海的水汽输送对于此次强降水起到了明显的增强作用。
제이용NCEP재분석자료，근거수기수지방정계산2012년7월21일북경특대폭우시기화북동북부폭우구역적수기수지정황병분석수기수송특정。득도이하결론：경향수기수송재차차폭우과정중기주요작용，폭우구내수기주요래원우중、저층（500 hPa이하）적남변계。폭우구내수기적복합여폭우발생적시간화공간구유교호일치성，재저층수기적복합기주요작용，중고층수기수직수송작용경위현저。HYSPLIT후향궤적모의득도적결과현시근거수기원지화분영향차차폭우과정수기수송로경주요유：종맹가랍만、남해지구처우중저층직접북상적서남로경，이급중층이하종아국동부해역（황해、동해위주）진입내륙지후북절향동북편북방향운동적L형고습로경；동시고층연착서풍대서북로경적간공기수송야대차차강강수유중요영향。삼자중종동부해역도체폭우구적수기공헌솔최대，이맹가랍만、남해적수기수송대우차차강강수기도료명현적증강작용。
By using the NCEP reanalysis data,the vapor budget of the area covered by the severe torrential rain over the northeast of North China on 21 July,2012 is calculated according to the vapor budget equa-tion.The results show that meridional water vapor transportation is dominant while the extremely heavy rain hits Beijing Region,where most moist vapor comes from the southern boundary below 500 hPa.The low-level regional moisture convergence is consistent with the time and space when the torrential rain breaks out and develops.Above the middle level the vertical vapor transport is more prominent.Then the variation features of the vapor transport corridors and their moisture contributions are got through the HYSPLIT mode.The backward trajectory analyses illustrate two major vapor transport corridors.The moistest vapor derived from Yellow Sea and East China Sea along the low level make the main moisture contribution during the heavy precipitation.Moisture from the South China Sea and the Bay of Bengal strengthens the water vapor in the region when the heavy rain starts and develops.Also the drier vapor corridor along the high level from the northwest of China plays an important role in this case.