科技通报
科技通報
과기통보
BULLETIN OF SCIENCE AND TECHNOLOGY
2014年
9期
38-41
,共4页
冷空气%大风%物理量场%垂直下沉
冷空氣%大風%物理量場%垂直下沉
랭공기%대풍%물리량장%수직하침
cold air%heavy wind%physical field%Vertical sinking
利用常规的地面、高空观测资料、物理量场资料对两次春季冷空气大风过程进行了对比分析。结果表明，中高层的西南急流自西向东影响，不稳定大气层结的加强和发展，是两次大风天气的触发和启动机制，中层冷空气的侵入，有利于强对流大风的发生；揭示了两次过程由于高低层辐合辐散差异而引起的大风区上空两类不同的高低空垂直下沉速度分布特征，指出动量下传作用在地面造成风速的加大主要决定于对流层中低层的下沉速度，这可能也是两次大风过程地面气压梯度接近，而实际风力却差一级的原因。
利用常規的地麵、高空觀測資料、物理量場資料對兩次春季冷空氣大風過程進行瞭對比分析。結果錶明，中高層的西南急流自西嚮東影響，不穩定大氣層結的加彊和髮展，是兩次大風天氣的觸髮和啟動機製，中層冷空氣的侵入，有利于彊對流大風的髮生；揭示瞭兩次過程由于高低層輻閤輻散差異而引起的大風區上空兩類不同的高低空垂直下沉速度分佈特徵，指齣動量下傳作用在地麵造成風速的加大主要決定于對流層中低層的下沉速度，這可能也是兩次大風過程地麵氣壓梯度接近，而實際風力卻差一級的原因。
이용상규적지면、고공관측자료、물리량장자료대량차춘계랭공기대풍과정진행료대비분석。결과표명，중고층적서남급류자서향동영향，불은정대기층결적가강화발전，시량차대풍천기적촉발화계동궤제，중층랭공기적침입，유리우강대류대풍적발생；게시료량차과정유우고저층복합복산차이이인기적대풍구상공량류불동적고저공수직하침속도분포특정，지출동량하전작용재지면조성풍속적가대주요결정우대류층중저층적하침속도，저가능야시량차대풍과정지면기압제도접근，이실제풍력각차일급적원인。
According to the analysis of windy weather caused by two spring cold fronts Using conventional ground, aerial observation data and the physical field, the results showed that the high-level southwest jet effect from west to east, unstable atmospheric stratification strengthening and development is the trigger mechanism,the middle intrusion of cold air is conducive to the occurrence of severe convective winds;reveals the process of the high and low convergence and divergence caused by differences over the two different types of wind zone low altitude vertical sinking velocity distribution, the role that the momentum in the ground caused by the downstream speed is mainly determined by the increase in the lower troposphere sinking speed, which could also be the surface pressure gradient approaching gale, but the actual difference between wind speed.
