Abstract:Radiosonde data at significant levels and parametric values of enhanced infrared images over the Changjiang (Yangtze)-Huaihe valley during the Meiyu(Plum Rain) season are fed into an improved time-independent one-and-one-half dimension warm cloud model. Formation and development of only three types of model clouds of different precipitation intensities are numerically analyzed. A simple method of using the output model rainfall to forecast Meiyu frontal precipitation amount is suggested. The results are found to be of significance in the study of the macro-and micro-structures of the precipitus clouds associated with the Meiyu front as well as in the estimation of its rainfall amount.

Abstract:Parameters of temperature sensivity to the ecliptic inclination are computed, with feedbacks of various zenith angles. of vegetation albedo and of latent heat being considered. Computation reveals the significance of feedback due to zenith angle in the Presence of ice or snow cover and the important role played by the feedback mechanism in the Milankovitch ice-age theory. The background global macroclimate in the ice age yields immense influence on the climate of East China. On the basis of the investigation of the Quaternary Period climate accomplished for the Lu shan Mountain, similar computations are performed on temperature and balance of mass of snow and ice for the Huangshan and Tianmushan, indicating that the low temperatures during spring and autumn are favorable for snowfall and ice accumulation.Altitude of the snow line over East China during the Quaternary Period is theoretically inferred and found to be consistent with that determined by geological study. It is further found that, with their advantageous topography. net accumulation of more than 200 meters of snow or ice may be attained over the Huangshan in 500 years, and about 100 meters for the Tianmushan.

Abstract:Behavior of the monsoon over the South China Sea during the early and late summer is investigated diagnostically. The result shows that there is a distinction in the characteristic features of the monsoon between these two periods of time owing to the different structure of the heating field between early and late summer. In the former period, the monsoon over the South China Sea is mainly associated with the Indian monsoon while in the latter case, the interaction with the Southern Hemispheric circulation becomes prominent.

Abstract:A systematic convective weather event called the MCC (Mesoscale Convective Complex) has been noted for its mechanism of formation and appearances in the satellite pictures by many meteorologists. A great number of MCC’s have been identified in the cloud pictures over mainland China since 1978. Typical cases are the ones occurred over East China on April 12, June 8, and July 12 of 1979 and April 4,1984. Cloud picture characteristics of the formation, development and dissination of the MCC over the eastern parts of Henan and Hubei and the provinces of Jiangsu and Anhui on June 8, 1979 are analysed and its structure is investigated.

Abstract:Analysis of weather data for the summer of 1979 shows that. when one or more low pressure systems are found over the western North Pacific with a wide stretch of tropical westerlies to the south of 10°N.large negative values of -(Δu/Δy) may appear in the area between 0° and 10°N. south of the low pressure belt. even though there is no cold outbreak in the Southern Hemisphere nor notable increase of easterlies along the equator. This favors the development of the equatorial buffer zone or the equatorial anticyclone. On the contrary. when the tropical and subtropical area of the Northern Hemisphere is under the domination of the high pressure belt and easterlies prevail on both sides of the equator.the value of -(Δu/Δy) would be quite small and no buffer zone or tropical anticyclone would form regardless of cold outbreaks in the Southern Hemisphere.

Abstract:Typhoon No. 8214 has not only an unusual track but also a peculiar life history. Analysis of the typhoon. making use of GMS cloud pictures and conventional weather data, is concentrated on its regeneration process and the interesting fact that the eye moves out of the dense cloud area during the weakening stage.

Abstract:A review is presented of the important points to consider when using a microcomputer as the central part of an automatic weather station. No previous knowledge of microcomputers is assumed. The principles described include the treatment of signals from meteorological sensors, the choice of computer hardware options, programming languages and techniques, and methods of producing output. An example is given of automatic weather station used to provide a public display of current weather parameters.