Analysis of the VWP Product Characteristics in One Strong Rainstorm Process

[Objective] The aim was to study the characteristics in VWP period characteristics in one strong rainstorm process.[Method] Based on the previous studies,the VWP product characteristics in early period of strong rainstorm,during the development and the end period in Hunan Province on April 8,2008 were studied.[Result] Before the occurrence of rainstorm,the destruction of low layer 'ND' layer indicated the increase of water vapor content layer.The intrusion of cold and dry air in the middle layer led to unstable layer;during the maintaining period of rainstorm,the strong vertical shear in the low layer led to the occurrence of strong rainstorm.The cold air in the boundary layer penetrated and led the rainstorm to the most prevailing stage.There was hailstorm on the ground.Before the disappearance of rainstorm(after 17:59),the entire wind field changed into consecutive 'ND' layer and it suggested that the strong convective cloud was far away from the location of radar,and indicated the end of rainstorm.[Conclusion] The study provided reference and basis for the pre-warning of rainstorm for temporary reporter.

Study on the Causes of Abnormal Weather in Winter in Jinzhou from 2009 to 2010

[Objective] The aim was to study the causes of abnormal weather in winter in 2009 and 2010 in Jinzhou. [Method] By dint of regular meteorological data and weather theory, the abnormal weather in winter from 2009 to 2010 in Jinzhou was expounded so as to find the reasons for abnormal climate in winter in the region. [Result] The main reason for the consecutive low temperature in winter in Jinzhou from 2009 to 2010 was the abnormal development of the Ural Mountains high-pressure ridge and strong horizontal circulation. The frequent cold air activity was the leading reason for the increase of precipitation in Jinzhou in winter; the high trough and low air torrent were the main weather system for precipitation. Convergence in the low layer was the dynamic condition for the generation of precipitation. [Conclusion] The study provided theoretical basis for the disaster prevention and mitigation work in winter.

Relationship of atmospheric boundary layer depth with thermodynamic processes at the land surface in arid regions of China

The atmospheric boundary layer （ABL） is an important physical characteristic of the Earth＇s atmosphere. Compared with the typical ABL, the ABL in arid regions has distinct features and is formed by particular mechanisms. In this paper, the depth of the diurnal and nocturnal ABLs and their related thermodynamic features of land surface processes, including net radiation, the ground-air temperature difference and sensible heat flux, under typical summer and winter conditions are discussed on the basis of comprehensive observations of the ABL and thermodynamic processes at the land surface carried out in the extreme arid zone of Dunhuang. The relationships of the ABL depth in the development and maintenance stages with these thermodynamic features are also investigated. The results show that the depth of the ABL is closely correlated with the thermodynamic features in both development and maintenance stages and more energy is consumed in the development stage. Further analysis indicates that wind velocity also affects ABL development, especially the development of a stable boundary layer in winter. Taken together, the analysis results indicate that extremely strong thermodynamic processes at the land surface are the main driving factor for the formation of a deep ABL in an arid region.

Variation in transboundary flow of Nujiang River and its correlation with summer monsoon under the effect of the Longitudinal Range-Gorge

在在纵的范围峡(LRG ) 的地形学的效果下面的 Nujiang 河 transboundary 流动和夏天季风活动的变化之间的关系被检验。学习基于观察的河流动数据，和他们与环境预言( NCEP )的国家中心和大气的研究( NCAR )的国家中心的重新分析的 U/V 风领域的关联的统计分析，并且国家海洋、大气的管理( NOAA )的出去的 Longwave 放射( OLR )的数据。transboundary 河流动主要被集中在，这被结束湿或雨季(从 5 月到 10 月) ，特别地在夏天或洪水季节(从 6 月到 8 月) 。有一个清楚的趋势让 transboundary 河流动自从 1970 年代，与时间增加，自从 1980 年代特别地明显。由于地形学的东方西方障碍和 LRG 的纵贯的走廊效果，夏天河流动变化大部分与风被相关在高、低的高度南方、在北方。相反，河流动变化显然与风被相关仅仅在高高度，不是在低高度在东方、西。在 OLR 和河流动变化之间的否定关联也是明显的。这些关系是用索引在这篇论文建议了的二夏天季风描述的份量上。索引 MI 2 包括动态并且 thermodynamical 在 Nujiang 河盆的 LRG 区域完成并且给 transboundary 河流动变化的一个通常好的代表。更大的 MI 2 代表更强壮的夏天季风活动和更高的 transboundary 河流动，当更小的 MI 2 建议更弱的季风循环和更低的水流动时。