高空反气旋 high aloft; high level anlicyclone; high level anticyclone; high-level anticyclone; upper anticyclone; upper level anticyclone; upper-level anticyclone; upper-level high
The quasi - geostrophic process was diagnosed for a case of severe cold air breakout under the blocking situation during 16 - 18 march of 1998 . the attention was focused on the relationship between the surface anticyclone and 500hpa blocking high . the results indicate that the cold outbreak is associated with the adjustment of blocking situation in the ural area , i . e . the collapsing and rebuilding of the ural mountain blocking high . the temperature advections in the lower troposphere shown that the polar cold air invading from the northwest caused the ural blocking high collapsed , and a new ridge developed rapidly was due to the warm advection on the southwestern side which led to the ural blocking high rebuilt . in addition , the distribution of the vertical motion on 700hpa shown that the surface high splitting was related to the considerable upward motion located on the southeastern part of surface high 对1998年3月中旬一次高空阻塞形势下强冷空气过程进行了诊断分析,着重讨论强冷空气爆发前后地面反气旋活动与高空阻塞形势调整的关系。研究结果表明,强冷空气的爆发与乌拉尔地区阻塞形势的调整阻塞高压的崩溃和重建紧密相关。对流层下部的温度平流分析表明,阻塞形势的调整是由于阻塞高压上游西北方有冷空气侵入导致了阻塞高压的崩溃,而上游来自西南方向的强暖流则导致高压脊迅速发展,使阻塞高压重新建立。
Based on this conclusion , the possibly formation mechanism of the double sh ridges is discussed . the results show that the formation process of double sh ridge is discrepant for the different style . the first style occurs as a result of the northward movement , the through - get and consolidation of the equatorial buffer band with the wpsh , and the second one is due to the strength , western extension , and then through - get and consolidation of the mid - pacific with the equatorial buffer band 在此基础上,分析了副高双脊线的形成原因,结果表明,不同类型的双脊线,其形成过程不同:第一类双脊线是赤道缓冲带(赤道反气旋)北上与副高打通合并的结果,而第二类双脊线却是由于中太平洋反气旋加强西伸,与赤道缓冲带打通合并而形成的。
When the spatial pattern is of the north - south asymmetry , in the warm north - cold south years , there is a anticyclone circulation existing over the warm pool at 850hpa , easterly at 15 n and westerly in the tropical region have been greatly strengthened , while the center of anticyclone circulation moves to the east asia at 200hpa , and the hadley circulation has been affected evidently , so the summer rainfall may be above normal in the middle and lower reaches of the yangtze river , vice versa . there are different relations to east asia atmospheric circulation and summer rainfall in china 当ssta为南北半球反对称分布时,与ssta北暖南冷分布相对应, 850hpa暖池区上空为一反气旋偏差环流, 15 n附近东风气流和赤道附近西风气流增强,长江中下游地区盛行偏南风气流; 200hpa反气旋偏差环流中心移到东亚大陆上空;副热带高压强度、西伸脊点都明显变强、西伸; hadley环流得到发展,长江中下游(华北)地区为上升(下沉)气流,降水明显增多(减少) ,北冷南暖年则相反。
Through analysis of potential vorticity in equity - entropy surface field , a relatively high potential vorticity center in cyclone top in low - troposphere have discovered , and make cyclone develop in a more deep cyclone circulation by this ; and an anticyclone circulation zone with more severe low potential vorticity in high - troposphere 通过对等熵面的位涡分析,发现了对流层中低层的位涡场,在气旋上方有一个相对高位涡中心,由此使得气旋在一个比较深厚的气旋性环流中发展;而对流层高层则是一个伴有较强位涡低值的反气旋环流区。
When the wpi - soi correlation is weak and the west pacific sst warmer ( colder ) , a anomalous anticyclonic ( cyclonic ) circulation is found in the lower troposphere over northern equatorial western pacific . this anomalous circulation is not in favor of maintaining a significant correlation between the west pacific sst and enso Wpi - soi相关关系微弱时,在西太平洋赤道北侧的对流层低层存在高(低)海温?反气旋(气旋)异常环流系统,不利于维持enso与西太平洋海温变化间的紧密联系。
Results show that there are two main spatial patterns of the wp ssta : one is uniform in the whole area , the other is of the north - south asymmetry . when the spatial pattern is uniform in the whole area , in the warm years , there is a anticyclone circulation existing over the warm pool and westerly in the subtropical region and easterly in the tropical region have been greatly strengthened at 850hpa , while a anticyclone circulation over the india region at 200hpa , the walker circulation has been strengthened , the summer rainfall may be above normal in the upper and middle reaches of the yangtze river , vice versa 当ssta为一致性分布时,暖异常年, 850hpa暖池区上空为一反气旋偏差环流,副热带地区西风和低纬度地区东风得到加强,长江中上游地区盛行偏南风气流; 200hpa南亚上空为一反气旋偏差环流,长江中上游地区为北风; walker环流加强,副热带高压偏强,经向垂直环流在25 35 n附近为上升气流,长江中上游地区降水偏多,是lanina事件的多发年,对应的soi指数偏高,冷异常年则相反。
In this paper , the circulation of 20hpa transits to anticyclone type first ( at april the twenty - fourth averagely ) and then the transition transmit downwards , 54 days later it arrive to 70hpa ( at june the seventeenth averagely ) . the interannual variation of transition dates in higher layers of middle stratosphere ( 10hpa 20hpa and 30hpa ) is more remarkable than in lower ones ( 50hpa and 70hpa ) . the transition dates of 50hpa and 70hpa have notable interdecadal variation feature : they are sooner before 1978 and later after 1978 多年平均20hpa环流最先转为反气旋型(平均在4月24日) ,然后逐渐下传,至70hpa (平均在6月17日)历时54天;而中平流层上部( 10hpa 、 20hpa和30hpa )转型日期的年际差异较下部( 50hpa 、 70hpa )大; 50 、 70hpa层环流转型日期具有明显的年代际变化特征, 1978年以前转型日期偏早, 1978年以后偏晚。
The anomalous non - uniform heating induces anomalous cyclonic vorticity in south china , areas to the south of the yangtse and its mid - lower valleys , but anomalous anticyclonic vorticity in the indo - china peninsula and south china sea areas lead to the more southward position of wpsh than the mean 这种异常的非均匀加热状况导致我国华南、江南、长江中下游地区呈现异常气旋性涡度制造,而中南半岛大部和南海地区为异常反气旋性涡度制造,使得1998年6月副高位置异常偏南。
When the tcf in nwp is high , the bengal bay cef which located at 90 e is strong and the new guinea cef located at 150 e is weak ; there is a anti - cyclonic circulation near the equator . the equatorial buffer zone is fortified : it is propitious to the equatorial anticyclones activated and push monsoon trough to higher latitude , this circulation pattern can promote the genesis of tc in nwp 多热带气旋年,位于90 e附近的孟加拉湾越赤道气流显著增强,而位于150 e附近的新几内亚越赤道气流异常偏弱;在赤道附近存在一个异常的反气旋性环流,赤道缓冲带较强,有利于赤道高压的活跃,季风槽被推向较高纬度,从而有利于热带气旋的生成。
The salinity distribution characteristics are the high - salinity in the bohai bay and the low - salinity in the boahi strait . the density distribution shows that there is a large cyclonic density circulation in bohai sea and it is likely to exist some density current gyre in the middle part of the bohai sea . in winter the saddle - like pattern of the bohai sea temperature and salinity shows that the circulation structure is much complexer than the previous research results 密度分布表明:夏季渤海湾口已经由以前的低密度中心变为现在的高密度中心,相应的环流结构也必会发生大的变化;夏季渤海中部会存在一个反气旋式的密度环流,并在局部可能存在多个密度流涡环;冬季渤海“马鞍状”温盐结构反映其密度环流结构要比以往研究结果复杂得多。