ISSN 1000-0526
CN 11-2282/P

Volume 19,Issue 11,1993 Table of Contents

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  • 1  A Comparative Analysis of Effect of Volcanic Eruptions at Low and Mid-High Latitudes on Drought/Flood in China
    刘永强 李月洪 贾朋群
    1993, 19(11):3-7. DOI: 10.7519/j.issn.1000-0526.1993.11.001
    [Abstract](405) [HTML](0) [PDF 201.72 K](394)
    Superposed-epoch analyses of drought/flood index in China for the past 500 years show substantial differences in spatial pattern and temporal evolution of the drought/flood with respect to low and mid-high volcanic eruptions. Drought events might appear more frequently in the key years (that is, eruption years)in North China,while significant rainfall anomalies might ocuur with great probability only in the following years. Finally,it is inferred that there would not be direct . ralationships between both eruptions of Pinatuebo in the Philippines and Unzendake in Japan and the extraoridinarily catastrophic flood in Changjiang-Huai river valley in summer of 1991.
    2  Chemical Character and Spatial and Temporal Distribution of Acidic Precipitation in Guangdong and Guangxi Provinces
    1993, 19(11):8-12. DOI: 10.7519/j.issn.1000-0526.1993.11.002
    [Abstract](493) [HTML](0) [PDF 162.46 K](376)
    We had established an acidic deposition network including 70 sites in Guangdong and Guangxi provinces and had done routine monitoring work on dry deposition and wet deposition simultaneously from January, 1988 to December, 1989. The results showed that frequency of acid rain was rising and was distributed along main wind direction from north to south in Guangdong and Guangxi provinces. The acidity of rain water was the most acidic and acid rain occured most frequently during spring season. The chemical composition of rain water were mainly Ca2+ , NH4+,SO42-. The average ratio of SO42-/NO3 -was 2. 7 times larger than that of the United States. The chemical components in rain water were mainly sulphate and it indicated that the acid rain in Guangdong and Guangxi provinces was caused by air pollution from coal burning.
    3  The Diffusion of Catalytic Agents of a Vertical Line Source in Stratiform Clouds
    申亿铭 余康元
    1993, 19(11):13-17. DOI: 10.7519/j.issn.1000-0526.1993.11.003
    [Abstract](432) [HTML](0) [PDF 158.21 K](411)
    A number of vertical line sources was generally caused by catalytic agents, dispersed from falling pyrotechnical flares of an airplane or a rocket. With the gradient-transfer theory of turbulent diffusion, we present a ther'otical model of agents diffusion of vertical line sources in supercooled stratiform clouds and, we give a calculative formula of superposing effect of agents' concentration of numerous vertical line sources, which were perpendiculor to the direction of horizontal wind or were parallel to the direction of horizontal wind.
    4  Measurement and Calculation for Infrared Transmittance of CH4
    王松皋 张广顺 朱舜斌
    1993, 19(11):18-20. DOI: 10.7519/j.issn.1000-0526.1993.11.004
    [Abstract](380) [HTML](0) [PDF 94.43 K](386)
    With FTIR spectroscopy and absorption cell infrared transmittance of CH4 has been measured. Using FASCODE 2 program the transmittance of CH4 has been calculated and compared with measurement.
    5  A Combined Weighting Method of Tropical Cyclone Track Forecasts
    吴天泉 费亮 薛宗元
    1993, 19(11):21-24. DOI: 10.7519/j.issn.1000-0526.1993.11.005
    [Abstract](354) [HTML](0) [PDF 151.75 K](406)
    Using the Combined Confidence Weighting Forecast method introduced by Tsui, T. L. , six kinds of objective forecast of different performances are tested in 3 forecast arears individually. The results indicate that the final combined forecast is more advanced than the each one of the six kinds of forecasts.
    6  The Air Water Resources and the Conditions for Artificial Precipitation in the Summer Drought Periods in Fujian Province
    曾光平 方仕珍 林芬
    1993, 19(11):25-30. DOI: 10.7519/j.issn.1000-0526.1993.11.006
    [Abstract](416) [HTML](0) [PDF 180.89 K](399)
    The distributions of the water resource in the air under conditions of various synoptic patterns in the drier duration in Summer are analysed. An Approach to the physical conditions for artificial precipitation in each arid area is made.
    7  A Comprehensive Comparison of Three Kinds of Weather Events in the Early-Rainy Season
    1993, 19(11):31-35. DOI: 10.7519/j.issn.1000-0526.1993.11.007
    [Abstract](337) [HTML](0) [PDF 161.20 K](365)
    Seven cases of storm rainfall, seven cases of ordinary precipitation and seven cases of fine weather events are chosen. The thermodynamic, the dynamical characteristics and their differences of the three kinds of weather events are comprehensively analysed,as a result,the short range forecasting models are obtained.
    8  Design of a Free-Oriented Vertical Cross-Section in Spherical Coordinates
    张绍晴 刘还珠
    1993, 19(11):36-40. DOI: 10.7519/j.issn.1000-0526.1993.11.008
    [Abstract](415) [HTML](0) [PDF 150.91 K](385)
    A free-oriented vertical cross-section with spherical trigonometric function is suitable to nu merical analysis in meteorological applications. It was shown that employing the scheme developed, the vertical structure of synoptic system can be exactly represented on the vertical cross section.
    9  Research on Agrometeorological Conditions for Direct Seeding Rice in Dry Land
    成励民 宋宝初 范德新 薛有桂 何福金
    1993, 19(11):46-49. DOI: 10.7519/j.issn.1000-0526.1993.11.010
    [Abstract](420) [HTML](0) [PDF 182.33 K](390)
    Based on the group-after-group sowing experimental data of 1990 and 1991 ,the photosensi tivity and thermosensitivity of the direct seeding rice in dry land and the relations between the percentage of the inperfect grain and the factors of illumination and temperature are analysed. And also some agrometerological problems such as the best time for safe sowing,the best time for safe head sprouting, arid ect. are resolved according to the local climate. All these results could provide scientific basis for further popularity of the direct seeding rice in dry land.

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