Abstract:A meso-scale analysis is made with respect to the torrential rain of June 9,1979 over Kwangdong, South China. Increased observational data in the experimental region are employed in eliminating diurnal changes of pressure field and then filtering with the result of a meso-scale pressure field with 1-hr intervals. In addition,the triggering and propagating mechanism of the rain is discussed by use of a 2-layer model of the inertia-internal gravity wave.

Abstract:During the heavy rain of 5-8 June, 1978 over South China a middle lower level jet was formed along the coast where the storm occurred. Budget analysis is made of kinetic energy and available potential energy over the area in which the jet stream appeared. The results show that kinetic energy of the jet originated from conversion of effective potential energy and from the subgrid-to-grid-scale kinetic energy trans formation as well.

Abstract:The results based on detailed analysis of data for the period of 23-25 June, 1981 indicate. 1) Such jet streams are different in structure, property and causes of their formation and 2) They do not exist separately and tend to inter superpose and interact mutually. These types of streams are all closely associated with occurrence of torrential rain.

Abstract:Fluid field dissolution shows that maintenance and evolution of the mean circulation can be studied by analyzing kinetic energy equlibrium. 500-mb pentad height data from 1972 through 1980 are used for calculating mean zonal kinetic energy, eddy kinetic energy and the rate of their conversion. The results indicate that the inter relations between the three parameters for kinetic energy of the mean pentad circulation as well as their seasonal and other periodical variations are analogous to, but smaller than, those of the instantaneous circulation. Analyzing the sequence of the parameters by the power and cross spectra yields main periodic changes of quasi-two-week oscillation. It is then found from the wave spectrum and mechanism of kinetic energy parameters that such oscillation is behavior of extra-long-wave activity in energy cycle. The primary process consists in the peak value of kinetic energy conversion occurring 3—4 days after the eddy energy has attained a peak one and in another 3—4 days the zonal average kinetic energy exhibits the same one.

Abstract:The study is concerned with the division of NSS over Asia into 6 seasons (i.e.spring, early and middle summers, autumn, the first and second halves of winter)based on EOF’s expansion of multiannual data of mean pentad circulations at 500-mb level and surface mean pentad temperature fields as well as on analysis of the annual curves prior to the expansion of time coefficients of the characteristic vectors. In addition, the lengths of each of seasons are determined together with its starting and ending, and a synoptic-statistical analysis is made of the primary features of the circulations within all the seasons.

Abstract:Data used come from 75 stations over China for 1957—1977.All factors in the formula and the calculating method are analyzed and compared. This results in a method more suitable for climatological calculation of total radiation for our country. Also, the spatial distributions of annual and monthly total insolation over the country are computed and shown on maps separately.

Abstract:The Weibull distribution parameters k,c are determined by mean wind and averaged maximum wind data. According to the values of the parameters, all characteristic quantities are computed with respect to data of the oretical wind power from 165 stations over China. The distributions of the quantities show that maximum wind power resource is available in Nei Monggol Autonomous Region, the coast along the Buohai Bay, the coastland in Southeast China, the vast plain of Northeast China and the Qinghai-Xizang Plateau and the minimum is found over the Sichuan Basin and the Tarim Basin. The analysis indicates that wind power resource increases with height quickly and then falls off slowly at further ascent.

Abstract:An objective analysis method is introduced of finite elements which represent variable grids or regions. It can meet the needs of both me teorologists at stations and scientific workers. For any station there is no strict limitation to data which can be gathered. The scheme is applicable, flexible and helpful to improving efficiency of analysis. A easels given in which 500rob height field is analyzed with good result by the method.