一个全球变网格多层原始方程差分模式的设计   总被引：1，自引：1，他引：1       下载免费PDF全文

廖洞贤 《应用气象学报》1997,8(1):1-10

文章设计了一个以均匀网格差分模式为基础的全球变网格多层原始方程差分模式。还证明了如果前者满足了一定条件，从而具有质量与能量守恒性质以及与连续情况一致的动能、位能和表面位能之间的转换关系，则变网格模式也同样具有。而且，把前者改变为后者增加的运算量很小，也非常方便。  相似文献   

垂直切变基流中东西向地形对惯性重力波稳定性的影响          下载免费PDF全文

吴洪  林锦瑞 《应用气象学报》1997,8(2):242-246

利用分层浅水波方程和小参数(WKB)方法，考虑具有垂直切变的基流和地形的作用，求得惯性重力波的局地频率方程，并根据此方程分析讨论了在多种环境条件下波动的稳定性情况。  相似文献   

一次台风暴雨的初步分析   总被引：17，自引：4，他引：17       下载免费PDF全文

黄文根邓北胜  熊廷南 《应用气象学报》1997,8(2):247-251

文章对1994年7月12～13日一次登陆台风造成的华北暴雨作了天气动力学诊断分析。分析表明，9406号台风登陆后，台风和太平洋副热带高压间形成的偏东南风低空急流，具有明显超地转特征，它是触发这次台风暴雨的关键系统。Q矢量诊断表明，Q矢量辐合区与暴雨位置较为一致。  相似文献   

Temporal and spatial distributions of dust and its deposition to the China Sea   总被引：5，自引：0，他引：5  

Y. GAO  R. ARIMOTO  R. A DUCE  X. Y. ZHANG  G. Y. ZHANG  Z. S. AN  L. Q. CHEN  M. Y. ZHOUS  D. Y. GU 《Tellus. Series B, Chemical and physical meteorology》1997,49(2):172-189

  相似文献   

VULNERABILITY OF AGRONOMIC SYSTEMS IN BULGARIA     

Vesselin A. Alexandrov 《Climatic change》1997,36(1-2):135-149

In recent years the problem of climate and its variations under the influence of natural processes and factors of anthropogenetic origin has come to the forefront of scientific and practical problems on a world-wide scale. Climate change vulnerability assessments of agronomic systems in Bulgaria have been initiated. In this paper preliminary results of this study are presented. Different climate change scenarios were defined. Global circulation model (GCM) scenarios and incremental scenarios for Bulgaria were created and applied. The influence of climate change on potential crop growing season above a base of 5° and 10 °C in Bulgaria was investigated. Increases in temperature can be expected to lengthen the potential growing season, resulting in a shift of thermal limits of agriculture in Bulgaria. The Decision Support System for Agrotechnology Transfer (DSSAT) Version 2.1 was used to assess the influence of climate change on grain yield of maize and winter wheat. Maize and winter wheat yields decreased with increasing temperatures and decreasing precipitation.  相似文献   

用卡尔曼滤波预报南海热带气旋路径的试验   总被引：2，自引：0，他引：2  

刘春霞  周家斌 《热带气象学报》1997,13(4):359-356

利用卡尔曼滤波方法预报南海热带气旋路径，发现采用卡尔曼滤波可以大大地降低预报误差，提高预测模型的预报能力。  相似文献   

陇南山区农业气候资源特征与开发利用     

余优森  尹东  费晓玲  任三学 《山地学报》1997,(4)

分析了甘肃陇南山区农业气候资源的分布特征及其水平、垂直差异,提出了合理开发利用的农业决策建议,指出应利用资源优势建立名特优小商品生产基地。  相似文献   

Geostrategies for both power and peace in KwaZulu-Natal: a neorealist analysis     

Richard Griggs 《GeoJournal》1996,40(4):387-396

In 1951–52, a nationwide sediment gauge network was initiated in Bulgaria. In 1992–93 a Computerized Information Base of Sediment Data for the Bulgarian rivers was developed. Some analysis has shown that the long term sequences of the annual suspended sediment load of the rivers are not homogeneous. The period 1980–90 has received special attention due to the anthropogenic generated randomeness of the hydrometeorological process on most of catchment areas across the country. Due to the anthropogenic impact, the sediment load assessments are strongly affected. The author has determined a new parameter — Partial Suspended Sediment yield — MR(°) that is formed in separate river reaches, bordered by any two adjacent gauges. The partial suspended sediment yield is zoned in selected grades instead of drawing isolines. A comparison among runoff (Q) and suspended load (R) for the rivers in Bulgaria reveals relationships that are in conformities with the process of suspended sediment formation. Some other empirical relationships of potential practical use for the Bulgarian rivers have been determined. The goal is to introduce some results of Bulgarian sediment studies to a Non-Bulgarian audience.  相似文献   

乌鲁木齐河山区流域360年径流量的重建   总被引：15，自引：0，他引：15       下载免费PDF全文

李江风  袁玉江  由希尧 《第四纪研究》1997,17(2):36-43

本文利用在乌鲁木齐河山区流域所建立的树轮年表，重建了乌鲁木齐河山区流域３６０年上年７月～当年３月的平均径流量。校准方程的相关系数为０．６７０，交叉检验的误差缩减值达０．３６６。在重建的３６０年径流量的变化中，有４个偏丰期和３个偏枯期，第２，３两个偏丰期与乌鲁木齐河河源１号冰川的两次冰进期相对应。对重建径流量的丰枯频率分析发现，平水年份出现最多，偏枯水年份多于偏丰水年份约５．８％，特枯水年没有出现，特丰水年出现６次，约占１．７％。这表明３６０年来径流量变化基本上稳定。  相似文献   

AN APPARENT TEMPERATURE MODEL BASED ON THERMAL EQUILIBRIUM          下载免费PDF全文

YU Bo  LIU Mei  YAO Kemin 《Acta Meteorologica Sinica》2004,18(1):117-128

In this paper,a comprehensive analysis and review of the advances in the research of human body comfort degree is made.Based on the studies of human thermal equilibrium theories contributed by previous researchers,different apparent temperature models corresponding to different environments are set up in accordance with the current situation and the characteristics of metabolism in different groups of people in China.After case studies and comparison with present dominant human body comfort degree statistical models,it is proved that the apparent temperature models have high rationality and wide adaptability.Furthermore,the comfort scaling standard according to apparent temperature is suggested,which is suitable for the middle latitude regions in China.  相似文献