农业灾害研究
農業災害研究
농업재해연구
JOURNAL of AGRICULTURAL CATASTROPHOLOGY
2015年
11期
32-36
,共5页
持续性暴雨%切变线%急流%中尺度对流系统
持續性暴雨%切變線%急流%中呎度對流繫統
지속성폭우%절변선%급류%중척도대류계통
Continuous rainstorm%Shear line%Jet stream%Mesoscale con-vection system
利用常规观测资料、NCEP1°×1°再分析资料、地面自动站降水实况资料以及卫星云图资料和雷达组合反射率因子资料等，从环流背景、形成机理、雷达回波与卫星云图特征等方面，对2012年7月14—17日娄底市持续性暴雨进行综合分析。结果表明，中高纬度不断有短波槽东移，副热带高压和中低层切变线稳定维持，低空西南急流发展强盛，是持续性暴雨发生的有利大尺度环流背景；在中尺度回波团或回波带及中尺度对流云团的影响下产生暴雨；中尺度对流回波或云团一般发生在多个天气尺度系统的汇合处，对暴雨预报有一定的指示意义；水汽辐合贯穿整个降水过程，在低层出现强湿度中心时，对应强降水发生；中尺度对流系统表现在整个对流层为上升运动，暴雨区位于CAPE值梯度不断加大的密集带中，低层θse锋区不断增强为对流性强降水发生提供了有利的不稳定条件。
利用常規觀測資料、NCEP1°×1°再分析資料、地麵自動站降水實況資料以及衛星雲圖資料和雷達組閤反射率因子資料等，從環流揹景、形成機理、雷達迴波與衛星雲圖特徵等方麵，對2012年7月14—17日婁底市持續性暴雨進行綜閤分析。結果錶明，中高緯度不斷有短波槽東移，副熱帶高壓和中低層切變線穩定維持，低空西南急流髮展彊盛，是持續性暴雨髮生的有利大呎度環流揹景；在中呎度迴波糰或迴波帶及中呎度對流雲糰的影響下產生暴雨；中呎度對流迴波或雲糰一般髮生在多箇天氣呎度繫統的彙閤處，對暴雨預報有一定的指示意義；水汽輻閤貫穿整箇降水過程，在低層齣現彊濕度中心時，對應彊降水髮生；中呎度對流繫統錶現在整箇對流層為上升運動，暴雨區位于CAPE值梯度不斷加大的密集帶中，低層θse鋒區不斷增彊為對流性彊降水髮生提供瞭有利的不穩定條件。
이용상규관측자료、NCEP1°×1°재분석자료、지면자동참강수실황자료이급위성운도자료화뢰체조합반사솔인자자료등，종배류배경、형성궤리、뢰체회파여위성운도특정등방면，대2012년7월14—17일루저시지속성폭우진행종합분석。결과표명，중고위도불단유단파조동이，부열대고압화중저층절변선은정유지，저공서남급류발전강성，시지속성폭우발생적유리대척도배류배경；재중척도회파단혹회파대급중척도대류운단적영향하산생폭우；중척도대류회파혹운단일반발생재다개천기척도계통적회합처，대폭우예보유일정적지시의의；수기복합관천정개강수과정，재저층출현강습도중심시，대응강강수발생；중척도대류계통표현재정개대류층위상승운동，폭우구위우CAPE치제도불단가대적밀집대중，저층θse봉구불단증강위대류성강강수발생제공료유리적불은정조건。
Using conventional obser-vation data, NCEP1° ×1° reanalysis data, rainfall data of ground automatic weather stations, satellite cloud imagery and radar composite reflectivity factor, this paper analyzed the continuous rainfall of Loudi City from July 14 to 17, 2012 from the perspectives of circulation back-ground, formation mechanism, radar e-cho, and satellite cloud imagery features. The results showed that short-wave troughs moved eastward continuously in middle and high latitude, subtropical high and low-level shear line remained stable, low-level southwest jet grew pow-erful, providing a large-scale favorable circulation background for the continu-ous rainstorm. Rainstorm occurred under the influence of mesoscale echo clusters and echo strips, and mesoscale convec-tive cloud clusters. Mesoscale convective echo or cloud clusters always occurred at the convergence of multiple synoptic scale systems, so they have indicative significance for the rainstorm forecast. Water vapor convergence run through the whole rainfall process, and as the strong humidity center appeared in the low lev-el, heavy rainfall occurred. Mesoscale convection system was demonstrated as ascending motion in the whole tropo-sphere, and rainstorm area was in the intensive belt with increasingly high CAPE value gradient, while increasingly stronger low-level θse frontal zone pro-vided a favorable instable condition for the occurrence of severe convective rain-fall.
