Abstracts for the 5th International GAME Conf.

3-5 October 2001

Aichi Trade Center

Nagoya Japan

The Dynamical Characteristics of Boundary Layer over Tibetan Plateau and Its Impacts

Xu Xiangde (1), Chen Lianshou (1)

The second TIbetan Plateau field Experiment (TIPEX) of atmospheric sciences was launched in the period of May to August 1998 which is 19 years away from the first one (QXPMEX). The scientists from China, Japan and other countries participated the field experiment with a cooperation plan. One of the scientific objectives was closely related to the Tibetan Plateau boundary layer observations. The advanced observational techniques were employed in the TIPEX. Three base stations of Gaize (Garza), Dangxiong (Damxunq) and Changdu (Qamdo) carrying out the boundary layer observations were set up by TIPEX. Plenty of valuable data from plateau boundary layer during IOP were successfully acquired. Data analysis shows that [1] the thickness of boundary layer on Plateau are much higher than it on plain area. It is favorable to the turbulent convection development over Plateau. The strong buoyancy effect on turbulent convection in which the air density obviously smaller than it over plain area and the Ekman spiral with its dynamic pump effect in plateau deep boundary layer were found. The local vertical distribution and horizontal advection of water vapor in Pateau boundary layer were studied. The abnormal thermodynamic structure [2] in plateau surface and boundary layer, including the plateau strong radiation phenomenon, strong heating source characteristics and the vertical velocity distribution in the middle part of plateau was analyzed. The authors synthesized above dynamic/thermodynamic structure in surface/boundary layer over the plateau and posed the comprehensive physical model of turbulence and convective mixture mechanism in Plateau boundary layer. The conceptual model [3] of dynamic and thermodynamic structure of turbulent and deep convection was given in this paper. The characteristics of formation, development and movement for cloud cluster over Tibet Plateau influencing the rainfall over Yangtze River basin were studied [4]. The numerical simulation also shows that there is close relationship between the heavy rainfall in the middle reaches of Yangtze River in July 1998.

Submittal Information

Name : Date :
    Chen Lianshou
    31-May-01-19:47:48
Organization : Theme :
    Chinese Academy of Meteorological Sciences
    Theme 2
Address : Presentation :
    Beijing 100081
    Poster or oral
Country : Abstract ID :
    China
    T2CL31May01194748
Phone : Fax :
    N.A.
    N.A.
E-mail :
    wangjz@cma.gov.cn