1989年大同—阳高6.1级地震烈度宏观考察     

大同—阳高地震烈度宏观考察组 《山西地震》1991,(3):18-30

文中叙述了大同—阳高地震区的烈度划分原则、烈度分布范围、烈度异常情况,给出了宏观地震参数(h=11.2km,震级5.8M_L),指出宏观调查的烈度值与强震仪记录的强余震加速度基本一致。  相似文献   

Entropy estimation of hydrological extremes     

N. C. Lind  H. P. Hong 《Stochastic Environmental Research and Risk Assessment (SERRA)》1991,5(1):77-87

The method of Relative Entropy with Fractile constraints (REF method) is explained and applied to model extreme compound hydrological phenomena, such as extreme sea levels under storm conditions. Also presented is a simple method of Tail Entropy Approximation (TEA), which amounts to a correction of traditional statistical estimates for extreme observations.Distribution assumptions are necessary but downplayed in the REF method, relegating the prior distribution to the role of an extrapolation function. The estimates are objective in an information-theoretical sense. They also satisfy a strict requirement of self-consistency that is generally not satisfied by standard statistical methods: invariance under monotonic transformations of the random variable.Historical records of storm surge levels in the Netherlands and annual maximum tidal heights for Sheerness, UK, are used as examples. Comparison is made with distributions obtained using other methods.It is concluded that the tail entropy approximation provides simple, objective estimates of extremes in the tail beyond the range of observations.  相似文献   

南北半球经向气压驻波与热带季风的相关特征     

朱乾根  徐祥德 《南京气象学院学报》1991,14(1):18-24

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北半球增暖对我国气侯的影响     

屠其璞 《南京气象学院学报》1991,(3)

本文在分析100多年来北半球平均气温长期变化基本特征的基础上,讨论了北半球气温变化对我国气候变化的影响。结果表明,我国大范围气温距平与北半球平均气温有显著的正相关,长江中下游和华北平原的温度距平值平均为北半球平均气温距平的1.4-1.6倍。还表明,我国降水距平分布与北半球气温变化也有一定的联系。在北半球平均气温偏高和偏低年份,欧亚地区500hPa环流特征的差异是显著的。这表明,我国大范围气候距平与北半球平均气温距平的统计相关是有一定的物理基础的。  相似文献   

统计模拟在经纬仪测风资料误差分析中的应用     

陈志鹏  张蕾 《南京气象学院学报》1991,14(3):340-345

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IAP GCM模式大气背景环流在厄尔尼诺年的异常     

王盘兴  刘家铭 《南京气象学院学报》1991,14(4):503-509

本文分析了中国科学院大气物理研究所大气环流模式(IAP GCM)模式大气5～9月平均环流(本文称为背景环流)。结果表明;厄尔尼诺年一系列重要系统(南方涛动、瓦克环流、哈德莱环流、西太平洋副热带高压和热带辐合带)及大范围降水均发生明显异常;北半球西太平洋热带、副热带是环流异常的主要区域。它们与观测资料的分析结果基本一致,从而论证了该模式在低纬环流研究中的应用前景。  相似文献   

夏—冬海气热力遥相关   总被引：1，自引：0，他引：1  

李跃清  章基嘉 《南京气象学院学报》1991,14(4):517-523

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1982—1983年强ENSO期间夏季全球低纬地区平均辐散环流分析     

阮均石 《南京气象学院学报》1991,14(4):532-537

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A CASE STUDY ON SANDSTORM   总被引：5，自引：0，他引：5       下载免费PDF全文

杨东贞  徐晓斌  温玉璞 《Acta Meteorologica Sinica》1991,(2)

The favourable synoptic situation and climate background for a sandstorm process,which occurred in theperiod 9—16 April 1988,have been studied through analyzing weather maps,meteorological elements,satellitecloud pictures and sandstorm trajectories.The sand dust origin area,the directions and the paths of sanddust transport,and the extent the sand dust reached are also investigated.The results of measurments andanalysis indicate that the concentration of sand dust particles is 10 times greater than the normal.It is also shownthat the elements in the sand dust are lithophylic and come from natural source through the chemical composi-tion analysis of the sand dust,so that the sand dust has not been polluted by human activities.  相似文献   

NUMERICAL EXPERIMENT OF THE INFLUENCES OF HEAT AND WIND STRESS ON THE EQUATORIAL OCEAN CIRCULATION   总被引：1，自引：0，他引：1       下载免费PDF全文

佘丰宁  巢纪平  王立治 《Acta Meteorologica Sinica》1991,(2)

A time-dependent linear model on the equatorial beta plane is developed in this paper.Its verticalstructure consists of two active layers with equal density and temperature above the thermocline and aquasi-stationary layer with constant density below the thermocline.The results of nurnericat experiments show that the direct influence of heat on the equatorial ocean ismuch smaller than that of wind stress.Nevertheless,through the tropical ocean-atmosphere interaction,the change of wind stress resulting from the thermal forcing may set a determinant effect on the equilibriumand anomalous development of the ocean-almosphere circulation.  相似文献