Vol.1, NO.2, 1986

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Gust Front Observation and Study by Radar
1986, 1(2): 113-122.
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Abstract:
In this paper, two types of gust fronts are compared by using the weather radar date obtained in Beijing, China and Oklahoma, U. S. A.. The first type is the fast moving gust fronts, which is often accompanied by violently developing storms, the onset of it gives an indication for the continuous development of severe storms. The other is the gust front moved slowly (static gust fronts) which is often occurred at the weakening stage of the relevant storm, the occurrence of it speeds up the end of the storm. The formation of the gust fronts is related to the downdraft in the storm, and the two types of gust fronts are the results of different interactions between downdraft and environment. Also, the cause of formation of the radar echo from the gust fronts has been studied too. It is believed that the radar echo is the result of activity of air turbulence occurred in the boundary between the draft and environment flow. The theoritical estimation of the echo intensity of gust fronts based on the Doppler weather radar data and tower data, is satisfactorily consistent with the observation data
A Single Station Lightning Location System
1986, 1(2): 123-132.
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Abstract:
This paper introduces a lightning vocation system which is based on Wait’s waves propagation theory. The system has only one station, which consists of a BC-5 Digital Waves Storgaer, a H-89 Microcomputer and a Controling Software Package. The system works in high storage speed (Max. 4 MW/sec) with easy changing function (by software) and wide frequency band (100 Hz-200 KHz). It was used to observe VLF spectrum of lightning electromagnic radiation and to locate lightning position
The Seasonal Change of the Wind Field in Southern Asia During the Onset of Summer Monsoon
1986, 1(2): 142-148.
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Abstract:
By using the wind data in summer months for 1973—1979, the seasonal change of the wind field in Southern Asia during the onset of summer monsoon is studied. It is found that during the onset the main components of Asian summer monsoon system show a marked change. The changes in the Indian monsoon region are more marked than that in the Eastern Asian monsoon region. We also found that in the huge Southern Asian monsoon system there are two sub-system one is the Indian monsoon system, and the other is the Eastern Asian monsoon system. The components in the Eastern Asian monsoon system are: Austrian anticyclone, low-level cross-equatorial flow at 105oE, monsoon trough in the South China Sea, subtropical high pressure ridge in the West Pacific and the Mei-Yu front in the Yangtze River Valley
The Climate Oscillations of the Circumpolar Circulation at 500 hPa in the Northern Hemisphere
1986, 1(2): 149-157.
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Abstract:
In this paper, the climate oscillations of the monthly circumpolar circulation index during 1951—1980 defined as the area enclosed 5520 m, isohypse are studied. It has been found that the circumpolar circulation index not only may easily undergo seasonal variations but also may vary with periodicity of oscillation such as 2—4 months, 5, and 19—20 years. During the period of 30 years from 1951 to 1980, the circumpolar circulation was contracted in the 1950s and expanded in the 1960s, However, during the 1970s, it kept oscillating in the vicinity of the average value. There exists a close relationship between the circumpolar circulation index and the surface air temperature or precipitation in China. When the circumpolar circulation is expanding (contracting), the surface air temperature will decrease (increase) and the precipitation will decrease (increase) in winter, spring and early summer and increase (decrease) in midsummer and autumn. These results can be used to explain the cause of climate change during the past thirty years
A Dynamic Study on the Role of TUTT in the Generation of Typhoon
1986, 1(2): 158-164.
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Abstract:
Based on the conditional instability of the second kind (CISK), a dynamical study on the role of the tropical upper tropospheric trough (TUTT) for the generation of typhoon has been carried out. The results show that TUTT plays a certain role in the generation of typhoon, but this effect is very weak in comparison with Ekman pumping and the cumulus momentum transport. Therefore, for the generation and development of typhoon, the circulation pattern of the middle- and lower –troposphere in tropics should be paid more attentions too.
The Deformation Field in the Planetary Boundary Layer and Heavy Rainfall
1986, 1(2): 165-174.
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Abstract:
In this paper, statistical analyst is was made on heavy rainfalls occurring in Hubei Province and the deformation field in the planetary boundary layer during Meiyu period of 1979—1981. It is found that heavy rainstorms are closely related to deformation field in the planetary boundary layer. Analyzing the deformation field in the planetary boundary layer gives a criterion for the movement and development of low pressure systems as well as an indication for the forecasting of heavy rain area in 12—24 hours
El-Nino Phenomena and 500 hPa Atmospheric Circulation in Northern Hemisphere
1986, 1(2): 175-184.
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Abstract:
In this paper, the teleconnection between sea surface temperatures in the eastern equatorial Pacific and 500 hPa geopotential height fields over the northern hemisphere has been discussed. The teleconnection patterns show that there are a positive correlation zone over the low latitudes and a negative correlation zone over the middle latitudes. The positive correlation region is located over the southwestern part of the Northern Pacific and the negative correlation region over the northern and central parts of Northern Pacific. It is found that there is a “large semicircular belt” which passes through the Northern Pacific, the North Pole, the Eastern America and the Northern Atlantic with positive and negative correlation regions alternatively. It is also shown that the conditions of subtropical high of the NW Pacific and Meiyu (bai-u) of Yangtze River Valley etc. are influenced by El-Nino phenomena
Assessment of Potential Output from Wind Power Generators in China
1986, 1(2): 185-195.
[FullText](5287) [PDF 420KB](1535)
Abstract:
In this paper, the method for evaluating the wind energy is discussed and the formula for calculating the wind power density in China by using the meteorological data is given, and also the climatic characteristics of the wind energy and the number of hours for wind energy utilization in China is analyzed. On the basis of this calculation, by using the method given by C. G. Justus for estimating the power output from wind-power generator, we have calculated the coefficients of the output capacity of the wind-power generator for three different types of wind-power generator in use in use country shown in diagrams
On the Adaptability of Stereoscopic Climatic Ecology of Rice in the Southeast of Sichuan
1986, 1(2): 196-203.
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Abstract:
During 1982 to 1984, we investigated climatic ecology and products of rice for more than thirty counties in Sichuan Province, and carried out seven experiments of sowing in different periods about rice stereoscopic climatic ecology at different altitude in the southeast of Sichuan Basin. This paper shows the characteristics of the stereoscopic climatic ecology in this region, studies the meteorological reason for lower yield of rice, and proposes the best way for fully utilizing the agroclimatic resource to get high yield of rice in the southeast of Sichuan Basin
The Radiation Characteristics of the Artifical Ecological Community of Robber-trees in Hainan Island
1986, 1(2): 204-211.
[FullText](5375) [PDF 427KB](1615)
Abstract:
In this paper, by using the experimental data of two stations in Hainan Island in China in Mar, 1983 and Apr, 1984, the radiation characteristics of the artifical ecological community in different kind of rubber plantation have been analysed and the radiation conditions in rubber-trees, tropical secondary forest, tropical grassland and bare-land have been compared. Also, an empirical formula for calculating the net radiation by using solar radiation is given
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