1991 年6月江淮持续暴雨的云系特征分析   总被引：1，自引：1，他引：1       下载免费PDF全文

叶惠明  张凤英 《应用气象学报》1993,4(3):293-300

通过对GMS静止卫星的红外数据处理，获得了1991年夏季江淮梅雨期暴雨大范围的平均云分布。对1991年6月6次江淮暴雨过程逐时和3小时的GMS红外云图动画和照片的分析，得到了该地区梅雨期暴雨的三种中低纬云系相互作用的云型演变模型图，并利用由卫星气象中心处理的NOAA卫星的TOVS水汽反演资料，结合低层的θse和急流分析，给出了1991年6月江淮暴雨的水汽输送的一些特征。  相似文献   

Energy Transportation In One- and Two-Dimensional Scattering Media: Analytic Solutions of the Multiple Isotropic Scattering Model     

Haruo Sato 《Geophysical Journal International》1993,112(1):141-146

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淮河上游大暴雨的水分平衡     

施其仁 《气象》1994,20(7):9-13

分析了淮河上游大暴雨过程的水汽来源和暴雨区的水分平衡。结果说明，暴雨区除有大量水汽净通量外，还有相当数量的水分来自云的净输送，尤其是大暴雨中心附近，积雨云团的净通量决定降水量的大小。因此，分析云的移动和变化是暴雨预报的重要课题。  相似文献   

亚洲夏季风系统水汽输送的季节平均和低频结构     

徐建军  何金海 《南京气象学院学报》1994,17(3):338-340

应用欧洲中期预报中心１９８０－１９８６年５－９月的８５０ｈＰａ逐日资料，分析了亚洲夏季风系统水汽输送的平均结构和低频结构。研究指出，从季节平均结构来看，亚洲季风系统是一个完整的体系。从低频活动结构看，亚洲夏季风系统中存在着印度季风和东亚季风系统的相对独立性。  相似文献   

各种大气水汽输送气候计算方法的比较和讨论   总被引：4，自引：0，他引：4  

史慧敏  林守廉 《南京气象学院学报》1994,17(3):372-378

比较瞬时法，平均法和逐层平均法３种水汽输送气候计算方案，发现它们的输送方向大致相同，输送量差异显著。瞬时法最准确；逐层平均法次之，但误差的年际波动较大，平均法虽然简单然而误差大。  相似文献   

CHARACTERISTICS OF TURBULENCE SPECTRA IN DIFFERENT WEATHER PROCESSES UNDER UNSTABLE CONDITIONS^*          下载免费PDF全文

Zhu Wenqin  Zhu Cuijuan  Li Xingsheng 《Acta Meteorologica Sinica》1994,8(3):296-304

In this paper,the data chosen from measurements by supersonic anemometers in Tongxian County of Beijing in 1990 are used to study characteristics of turbulence spectra in precipitation weather.Some turbulence parameters such as turbulence intensity,heat and momentum fluxes,friction velocity,M-O length and stability parameter are calculated and their dependence on turbulence spectra in different stability conditions are analyzed.Some encouraging results are obtained and compared with others' results.  相似文献   

神府煤田大柳塔矿区高分辨率地震勘探     

刘昌铨  刘保金  孙振国 《东北地震研究》1994,(4)

利用高分辨率地震反射法，在地表沙丘、沙垅无规则分布的神府煤田大柳塔矿区为采掘巷道作业，勘探垂直断距２ｍ以上至５ｍ的断层分布。试验观测结果取得了良好的效果。  相似文献   

热液成矿作用的一般动力学方程   总被引：3，自引：1，他引：3       下载免费PDF全文

鲍征宇  唐促华 《地球科学》1994,19(3):313-319

分析了热液成矿作用的基本特点和研究现状，推导出热液成矿作用动力学体系的一般方程，并着重讨论了方程中表征热液与围岩之间化学反应的速率项，除目前一般采用动力学实验实测反应速率常数外，作者根据局域平衡原理，认为成矿作用可视为体系内各点随着温度和压力的变化不断重建平衡的过程，可用温度和压力变化时成矿反应的平衡常数的变化速度表征成矿反应的动力学行为，成矿化学反应的速率还可用主要成矿物质的溶解的变化率来表征。  相似文献   

Winds and sand movements in the Namib Sand Sea     

N. Lancaster 《地球表面变化过程与地形》1985,10(6):607-619

Wind regimes in the vicinity of the Namib Sand Sea are high energy unimodal near the coast, becoming bimodal or complex inland. There is an overall decrease in wind energy and sand transport rates from south to north and west to east, such that sand moves from coastal and southern source areas to accumulate in the northern and central parts of the sand sea. Such a pattern can explain much of the observed spatial variability in dune types, sizes, and sediment characteristics and lends support to a climatic model of sand sea formation in this region. Seasonal and daily cycles of wind velocity and direction give rise to episodic sand transport, most of which is generated by winds of moderate velocity and frequency.  相似文献   

Eolian processes in alpine belts of the high Tatra mountains,Poland     

Bogdana Izmailow 《地球表面变化过程与地形》1984,9(2):143-151

Eolian processes were the subject of detailed studies in the high-mountain area of the Tatra Mts. The field investigations in 1975–80 attempted to determine the amount of deflation and eolian deposition and to improve understanding of their mechanism. The net rates of these processes were determined from repeated survey of deflational forms and of eolian deposits. Observations of the mechanism of material displacement were based on field experiments carried out during strong winds. All the investigations were conducted using simple methods and traps. Relationships between the course and intensity of processes and wind conditions and soil properties were obtained.  相似文献