Current Issue

• A DISCUSSION ON THE ENERGY TRANSFER MECHANISM WITHIN BAROTROPIC ATMOSPHERE
• Jan Paegie;Julia N Paegie;Yan Hong
• 1983 Vol. 2 (4): 1-19. 
• Abstract ( ) PDF (1172KB) ( )
• The results of integatious of both barotropic vorticity equation and shallow water equation on sphere have shown the role that regions with small absolute vorticity gradient play in Rossby wave activities. And its effects on the propagation of Rossby waves might be effected by ambient flows which locally may be unable to sustain oscillations due to small vorticity gradient.

• PROGNOSTIC AND SEMI-PROGNOSTIC TESTS OF A KUO-TYPE CUMULUS PARAMETERIZATION SCHEME WITH A SIMPLE CLOUD MODEL
• Zhang Zhiming;Erich Roeckner
• 1983 Vol. 2 (4): 20-33. 
• Abstract ( ) PDF (908KB) ( )
• A cumulus cloud parameterization has been developed for use in a general circulation model. The scheme is based largely on the approach of Kuo(1974):cumulus clouds may develop in a conditional unstable atmosphere if there is sufficient moisture supply by large-scale advection and evaporation from the surface. Cloud parameters, such as temperature, water content, vertical velocity and entrainment, are calculated from a one-dimensional cloud model. The scheme has been applied to a case study of a composite easterly wave in the tropical eastern Atlantic during GATE, Phase III. Precipitation rates and also the vertical distribution of convective heat and moisture fluxes are compared with observations, as analysed by Thompson et al.(1979) for 8 categories of the composite wave. Finally,a prognostic test has been performed by two days simulations with a general circulation model starting from real initial conditions. The results are compared with those obtained with the scheme of Kuo(1965).

• THE MEAN TRANSFER OF WATER-VAPOUR IN THE ATMOSPHERE OVER CHINA
• Lu Yurong;Gao Guodong
• 1983 Vol. 2 (4): 34-48. 
• Abstract ( ) PDF (903KB) ( )
• The formula to calculate the water vapour mean transfer in atmosphere can be written as:??? in which g is the acceleration of gravity, q is the mean specific humidity, P ₀ and P ₁₀₀ are the atmospheric pressure on the earth's surface and the isobaric surface of 100mb respectively, V is the mean velocity of wind in the given place at a given time. If u is the wind velocity in latitudinal direction, V is the wind velocity in longitudinal direction, the latitudinal transfer of vapour in atmosphere is ??? and the longitudinal transfer of vapour in atmosphere is ??? In this paper, utilizing the mean data of more than 100 stations of 10 years in China(1961-1970), we calculated the following quantities:1.The water vapour transfer of the every month and the whole year at the altitudes of 850 mb, 700 mb, 500 mb over China. 2. The latitudinal transfer of water vapour of every month and the whole year. 3. The longitudinal transfer of water vapour of every month and thewhole year. 4. The total value and the direction of transfer of water vapour in the whole layer of every month and the whole year.

• A CASE STUDY ON HEAVY CONVECTION WEATHER PROCESS UNDER THE SOCTH-WESTERLY CURRENT IN THE 500mb LEVEL
• Feng Zhixian
• 1983 Vol. 2 (4): 49-57. 
• Abstract ( ) PDF (652KB) ( )
• In this paper, a heavy convection weather process occurred over Yang-tze and Huai Rivers on May 26, 1982 was discussed. It is found that:1.Under warm-air advection in the upper level and coldair advection in the low level of the troposphere, the source of the heavy convective development could he also provided by the latent-labile energy, if in the low-middle level there is a enough increase in moisture, 2.The source of the heavy convective process in this paper is the latent -labile energy. The mechanism of its release might be as followings:Firstly, the combined air convergence in the frictional layer and orographic effect caused a local severe convection, then the heavy downdraft flow of the local convection resulted in the squall front forming which moreover drove the larger region latent-labile energy to be released to give rise to a large scale of severe convection system in transport.

• THE CONTRAST ANALYSIS OF THE HORIZONTAL TEMPERATURE ADVECTION WITH THE EVOLUTION OF STRATIFICATION FEATURES DURING THE HAIL PROCESS IN PINGLIANG REGION
• Xu Wenjun;Ma Jibe;Zhang Cuihua
• 1983 Vol. 2 (4): 64-70. 
• Abstract ( ) PDF (502KB) ( )
• Using the sounding over Pingliang and its surroundings have estimated the effects of horizontal temperature advection towards the temperature changes at 700mb and 300mb levels during the hail process there.After having compaved the computed values with the temperature evolution from the souuding,we hold that the acoumlation and evolution of the unstable energy during the earlier stage of storm weather is difficcult to explain by the transport process of horizontal temperature advection.