ISSN 1000-0526
CN 11-2282/P

Volume 24,Issue 12,1998 Table of Contents

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  • 1  The Progress and Development of Numerical Weather Prediction Research and Operation in USA
    陈德辉
    1998, 24(12):3-7. DOI: 10.7519/j.issn.1000-0526.1998.12.001
    [Abstract](404) [HTML](0) [PDF 365.99 K](541)
    Abstract:
    The recent progress and development of Numerical Weather Prediction (NWP) in the USA was summarized. A general discussion about the development of operational NWP systems in China was given in the last section.
    2  The Analysis of Composition and Assessment of Bumper or Poor Harvest for Total Grian Yield in China
    王建林 太华杰
    1998, 24(12):7-12. DOI: 10.7519/j.issn.1000-0526.1998.12.002
    [Abstract](653) [HTML](0) [PDF 336.72 K](563)
    Abstract:
    ①The variation of the mean grain yield per unit area amounts to two thirds of change of the total grian yield,and plays a decisive role. ② Since the 1950s,percentages of wheat and maize yield in the total grain yield have been individually tending to increase,rice to relatively stable,but that of soybean etc. to decrease.③ So far as the principal grain crop yields per unit area are concerned,the yield of single rice harvest is the highest,the increase of wheat yield is the fastest. The relationships between bumper or poor harvest of the mean grain crops per unit area and weather condition suggests that the connections between precipitation of Northwest and Northeast regions,and accumulated tempertatue of North China and good or bad harvest of the grain crops are intimate. The accuracy of this model established by these factors for assessing good or bad harvest of the grain crops is over 85 Percent.
    3  The Quantitative Relation between the Equivalent Torrential Rain Day and the Total Rainfall at the Flood Period
    吴正华 李海盛 储锁龙
    1998, 24(12):13-17. DOI: 10.7519/j.issn.1000-0526.1998.12.003
    [Abstract](486) [HTML](0) [PDF 255.61 K](558)
    Abstract:
    The correlational coefficient between the number of the equivalent torrential rain day and the total rainfall at June~August of this century in Beijing is 0.97. The correlational coefficient between the regional average number of the equivalent torrential rain day and the regional average total rainfall is 0.94. The linear correlation between the number of the equivalent torrential rain day and the total rainfall is given by the regression equation and the scatter diagram. The root mean square error of the total rainfall calculated by the regression equation is near 10 percent. The method of the total rainfall calculated by the number of the equivalent torrential rain day can be applied to the operational use.
    4  An Analysis of Lighting Characters of Cold Vortex Hailstorm
    杨文霞 刘海月 张杏敏 韩根夫
    1998, 24(12):18-21. DOI: 10.7519/j.issn.1000-0526.1998.12.004
    [Abstract](655) [HTML](0) [PDF 220.35 K](582)
    Abstract:
    The data of single station lightning detection and ranging system and 713 radar echoes achieved from 4 cold vortex hailstorm events from 1996 to 1997 are analyzed. The results show that the number of times of lightning have a brewing and leaping procedure before the hail begins to drop 5 minutes,it reaches the maximum when the hail begins to drop and after the hail dropping it descends slowly. The distribution of cloud discharge and total lightning frequency corresponds with this phenomenon better. Comparing the ground area hitted by lightnings and the ground place of hails dropping on,it is found that the area coincides with the place well. Put the lightnings' place and the intensity data on top of the radar echoes picture,it is found that the place where lightnings appear frequently is just the place where the radar echoes are strong.
    5  A Case Analysis of Severe Local Storm In Guangdong Province during April 18~19, 1996
    林志强 李献洲 庄旭东
    1998, 24(12):22-26. DOI: 10.7519/j.issn.1000-0526.1998.12.005
    [Abstract](399) [HTML](0) [PDF 415.72 K](577)
    Abstract:
    A severe local storm in Guandong province during April 18~19,1996 was analysed with synoptic charts,satellite images and sounding. It is shown that severe and convective weather events produced by the meso scale convective systems were accompanied by the continuous affects of cloud systems of the southern branch and middle latitude trough. The mechanism of this event was discussed.
    6  An Analysis of the Circulation Characteristics for the Previous Period in More High Temperature Year and Less High Temperature Year
    缪国华 施丹平 唐毅
    1998, 24(12):27-32. DOI: 10.7519/j.issn.1000-0526.1998.12.006
    [Abstract](467) [HTML](0) [PDF 345.25 K](525)
    Abstract:
    The method of composite analysis is used to diagnose the deference of the circulation characteristics between the more high temperature year and the less high temperature year for the previous period by using 500 hPa data from 1951 to 1996. The results show that the deference is clear. In the more high temperature year,there are persistent positive anomalies in south of Asia from Jan. to June and the teleconnection over the West Pacific during the winter,and in the less high temperature year,anomalies in south of Asia are negative and the teleconnection over the West Atlantic is obvious. In April,Aleutial low and Alaska high are strong in the more high temperature year and they are week in the less high temperature year. The relationship between high temperature and 74 circulation indexes is analyzed. The results show that there are well positive correlation with the areas of subtropical high in Indian in spring and the position of subtropical high in the northern hemisphere in March,and the negative correlation with indexes of Eurasia longitude correlation in April and of East Asia trough's strength in Jan. and Apr. is notable.
    7  Quality Control of Meteorological Data in Climatic Special Data Bank
    杨贤为
    1998, 24(12):33-36. DOI: 10.7519/j.issn.1000-0526.1998.12.007
    [Abstract](791) [HTML](0) [PDF 247.89 K](2)
    Abstract:
    It is discussed that the quality control of some common meteorological data as temperature,precipitation and sunshine duration in the climatic special data band is essential before used. The methods and steps for basic quality control,time consistency check and space quality control are also introduced.
    8  Quality Control of Meteorological Data in Climatic Special Data Bank
    俞善贤
    1998, 24(12):37-38. DOI: 10.7519/j.issn.1000-0526.1998.12.008
    [Abstract](423) [HTML](0) [PDF 154.28 K](577)
    Abstract:
    It is discussed that the quality control of some common meteorological data as temperature,precipitation and sunshine duration in the climatic special data band is essential before used. The methods and steps for basic quality control,time consistency check and space quality control are also introduced.
    9  The Application of the Provincial Computer Network in 9210 Project to the Former Meteorology Professional System
    秦亚军 谢今范 马吉祥 李宗文
    1998, 24(12):39-42. DOI: 10.7519/j.issn.1000-0526.1998.12.009
    [Abstract](470) [HTML](0) [PDF 235.02 K](543)
    Abstract:
    By internetworking,the former meteorology professional system can be used with the application of the real time data from the satellite network,so the timeliness of the meteorological forecast was increased.
    10  Climate Change and Yunnan Agrometeorological Disaster
    秦剑
    1998, 24(12):45-51. DOI: 10.7519/j.issn.1000-0526.1998.12.011
    [Abstract](505) [HTML](0) [PDF 449.53 K](7)
    Abstract:
    The meteorological disaster as a kind of natural calamity restricts the development of agriculture in Yunnan. It endangers Yunnan agriculture by a few main severe weather events such as drought,flooding, chilling,etc. and their basic feature was analyzed emphatically. At the same time,it is extremely important that people recognize correctly the status of meteorological disaster research in the two respects of agriculture production and ecological system.
    11  Analysis of Meteorological Conditions and Forecasting for the Heat Balloon Flying over Taishan Mountain
    刘清洵
    1998, 24(12):51-54. DOI: 10.7519/j.issn.1000-0526.1998.12.012
    [Abstract](475) [HTML](0) [PDF 704.76 K](532)
    Abstract:
    The meteorological conditions for a heat balloon flying over the Taishan mountain and the effect of the mountain of a heat balloon flying were discussed. By using historical data from Sep. to Oct. during 1988 to 1995,the meteorological conditions fitting the operation of a heat balloon flying were analysed. According to the weather situation and the characteristic that a heat balloon flying over the Taishan mountain was effected by many elements,some factors of better relativity among the elements were selected,and the forecast equations were established respectively,and then the synthetic forecast was given.

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