CAJ | 학술논문

提利用 MICAPS 资料、多普勒气象雷达资料和 NCEP 资料等，对2012年7月26日20：00至27日20：00黄土高原发生的一次β中尺度致洪暴雨过程的特征及成因做了分析。结果表明：近地层能量比低值舌的活动是两次强降水产生的触发机制之一；暴雨过程两个强降水时段都对应邻近暴雨区的北方1 km 以内的边界层大于20 m·s-1偏东风相对风暴气流的建立，而邻近暴雨区的北方1 km 以内的边界层大于15 m·s-1偏东风相对风暴气流减弱消失、或范围大幅度缩小，则对应强降水的减弱或停止；涡度收支分析表明，第一次强降水前，由于水平平流项的作用在300 hPa 附近形成很强的负涡度收支；第二次强降水前，主要是扭转项和垂直输送项的作用，同时在450～300 hPa 形成很强的正涡度收支；视热源与视水汽汇分析表明：第一次强降水前，视热源在300 hPa 附近出现比较强的冷却层；第二次强降水前，800～500 hPa 视水汽汇远大于视热源，形成正的加热层；500～200 hPa 视热源远大于视水汽汇，形成峰值接近11 K·（6 h）-1的很强的加热层；而在200～130 hPa 由于视热源的作用，形成冷却层。
제이용 MICAPS 자료、다보륵기상뢰체자료화 NCEP 자료등，대2012년7월26일20：00지27일20：00황토고원발생적일차β중척도치홍폭우과정적특정급성인주료분석。결과표명：근지층능량비저치설적활동시량차강강수산생적촉발궤제지일；폭우과정량개강강수시단도대응린근폭우구적북방1 km 이내적변계층대우20 m·s-1편동풍상대풍폭기류적건립，이린근폭우구적북방1 km 이내적변계층대우15 m·s-1편동풍상대풍폭기류감약소실、혹범위대폭도축소，칙대응강강수적감약혹정지；와도수지분석표명，제일차강강수전，유우수평평류항적작용재300 hPa 부근형성흔강적부와도수지；제이차강강수전，주요시뉴전항화수직수송항적작용，동시재450～300 hPa 형성흔강적정와도수지；시열원여시수기회분석표명：제일차강강수전，시열원재300 hPa 부근출현비교강적냉각층；제이차강강수전，800～500 hPa 시수기회원대우시열원，형성정적가열층；500～200 hPa 시열원원대우시수기회，형성봉치접근11 K·（6 h）-1적흔강적가열층；이재200～130 hPa 유우시열원적작용，형성냉각층。
MICAPS data,Doppler radar data,NCEP data,etc.are used to analyze the characteristics and causes of a meso-βscale flood-causing rainstorm on Loess Plateau from 20:00 BT 26 to 20:00 BT 27 July 2012.The results show that the activity of low energy ratio tongue in the surface layer is one of the trigger mechanisms for the two severe raifalls.The two periods of torrential rains both correspond to the estab-lishment of easterly winds relative to storm airflow faster than 20 m·s-1 that is adjacent to the north of the storm zone within 1 km of the boundary layer,while easterly winds relative to storm airflow within 1 km of the boundary layer close to the north of the storm zone get weakened and vanished,or the range drastically reduces,causing the severe precipitation to lesson or stop correspondingly.Analysis on <br> vorticity revenue and expenditure shows that before the first rainstorm the dominant factor is horizontal advection item in the formation of strong negative vorticity revenue and expenditure near 300 hPa.Before the second rainstorm,the dominant factors are twisting item and vertical transportation item in the forma-tion of strong positive vorticity revenue and expenditure in the 450-300 hPa at the same time.Analysis on apparent heat source and apparent moisture sink shows that before the first rainstorm,the appearance of apparent heat source near 300 hPa is quite strong cooling layer.Before the second rainstorm,positive heat-ing layer is formed for the apparent moisture sink is much larger than the apparent heat source in the 800-500 hPa.The formation of strong heating layer whose peak is close to 11 K·(6 h)-1 for the heat source is much larger than apparent moisture sink in the 500-200 hPa.Due to the role of the apparent heat source, cooling layer is formed in 200-130 hPa.