|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 华东地区6—7月锋生的气候学特征及环流结构显示文摘利用中国华东地区212个站点2000-2010年6-7月逐日降水资料和NCEP/NACR再分析资料,运用运动学锋生函数公式,分析了华东地区6-7月锋生、锋面及其环流结构的气候学特征。结果表明,锋生函数值在华东区域呈现不均匀分布,且不同性质的运动学锋生具有不同的锋生强度和分布。其中,江淮地区是6-7月综合锋生最强的区域。根据风场在850 hPa强锋生带的切变及辐合情况,将6-7月的锋生类型分成4个大类,即暖切变型锋生、冷切变型锋生、西风辐合型锋生、东风辐合型锋生,其中,冷切变型锋生又分为两个亚类。不同类型的锋生个例数不同,江淮地区最多的是暖切变型锋生。不同锋面的水平结构与垂直结构存在显著差异,但对于强锋生过程,340 K假相当位温等值线与锋区平行且穿过锋区,其对判断强锋生过程和锋区位置具有指示意义。强锋生事件的出现有其大尺度环流背景,而不同类型的强锋生事件的环流背景差异较大:背景气旋或反气旋环流的中心位置、强度、辐散辐合场的分布、垂直环流结构等方面有不同程度的差异。降水与锋生强度紧密相关。锋生较强时,降水较多。暖切变型锋生日降水量最大,降水发生在锋区内部,与强锋生带走向一致;冷切变型次,两种类型的降水均发生在锋区的南侧,呈东北—西南走向;西风辐合再次之,降水发生在锋区内部偏南一侧。 | 侯俊 管兆勇 | 2013 | 气象学报2013，71，1： | 19 |
| 2 | Climatological Characteristics of Frontogenesis and Related Circulations over East China in June and July显示文摘Based on daily precipitation data from 212 stations in East China and NCEP/NCAR daily global final analysis data in June and July from 2000 to 2010, the climatological characteristics of frontogenesis and related circulations have been analyzed. The results demonstrate that frontogenesis function distributes nonuniformly in East China. The different terms of the kinematic frontogenesis show different intensities and distributions of frontogenesis. The strongest frontogenesis integrated from different kinematic frontogenesis terms is observed in the Jianghuai area. Frontogenesis events are separated into four types as per the different shear and convergence types of horizontal wind along the strong frontogenesis band at 850 hPa. The four types include the warm shear type, cold shear type (with two subtypes), west wind convergence type, and east wind convergence type. The events in different frontogenesis types occur with different frequencies over the past decade. The warm shear type occurs most frequently. Different types of frontogenesis have distinctive horizontal and vertical structures. Strong frontogenesis is featured with 340-K contour of θse parallel to the frontal zone in the vertical. Varied large-scale circulation patterns manifested in shifted location and strength of cyclone or anticyclone, wind convergence, as well as vertical circulation structure are associated with different types of frontogenesis. Moreover, a strong positive correlation between frontogenesis and precipitation is found, i.e., the stronger the frontogenesis, the more precipitation there is. Daily precipitation related to the warm shear type frontogenesis is the largest, and often occurs inside the frontal zone with the same orientation with the strong frontogenesis belt. The second largest daily precipitation occurs with the cold shear type frontogenesis, and related rainfall is usually observed to the south of the frontal zone, with the rain belt extending northeastward. Precipitation related to the west wind convergence type frontogenesis is the third largest, occurring mostly in the south of the frontal zone. | 侯俊 管兆勇 | 2013 | Acta meteorologica Sinica2013，27，2： | 4 |
| 3 | Transition from the Southern Mode of the Mei-yu Front Cloud System to Other Leading Modes显示文摘Based on normalized six-hourly black body temperature(TBB) data of three geostationary meteorological satellites, the leading modes of the mei-yu cloud system between 1998 and 2008 were extracted by the Empirical Orthogonal Function(EOF) method, and the transition processes from the first typical leading mode to other leading modes were discussed and compared. The analysis shows that, when the southern mode(EOF1) transforms to the northeastern mode(EOF3), in the mid-troposphere, a low trough develops and moves southeastward over central and eastern China. The circulation pattern is characterized by two highs and one low in the lower troposphere. A belt of low pressure is sandwiched between the weak high over central and western China and the strong western North Pacific subtropical high(WNPSH). Cold air moves southward along the northerly flow behind the low, and meets the warm and moist air between the WNPSH and the forepart of the low trough, which leads to continuous convection. At the same time, the central extent of the WNPSH increases while its ridge extends westward. In addition, transitions from the southern mode to the dual centers mode and the tropical-low-influenced mode were found to be atypical, and so no common points could be concluded. Furthermore, the choice of threshold value can affect the number of samples discussed. | QIN Danyu LI Bo HUANG Yong | 2014 | Advances in Atmospheric Sciences2014，31，4： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员