一个降水再循环模型的建立及分析   总被引：3，自引：1，他引：3       下载免费PDF全文

伊兰  陶诗兰 《水科学进展》1997,8(3):205-211

陆-气相互作用是当今水文科学界和大气科学界共同瞩目的一个前沿课题。为寻求陆-气相互作用的某些信号,在长江流域的主体区域上建立了一个降水再循环模型,并分析了这一区域降水的不同水汽来源。依据再循环降水率这个反映陆面过程对当地气候影响的定量指标,得出了一些很有实际意义的结论。  相似文献   

AIR-SEA COUPLING MODES OF TROPICAL PACIFIC SSTA AND WIND STRESS FIELDS     

张勤  蒋贤安  何金海 《热带气象学报(英文版)》1996,2(2):129-136

The EOF thechnique is employed to investigate the characteristic modes of spatial distribution and features of temporal variation in the context of 1970-1989 wind stress and SSTA datasets over the tropical Pacific. Results show similar variation in the time coefficients of the first eigenvectors for the wind stress and SSTA fields, revealing air-sea interaction and coupling at the multiple space/time scales,which are in fairly good correspondence to the E1 Nino cycle.  相似文献   

A FURTHER STUDY ON INTERACTION BETWEEN ANOMALOUS WINTER MONSOON IN EAST ASIA AND EL NINO^*          下载免费PDF全文

Li Chongyin 《Acta Meteorologica Sinica》1996,10(3):309-320

The interaction between anomalous winter monsoon in East Asia and El Nino is further studied in this paper.The new results still more proved a previous conclusion:there are clear interactions between El Nino and winter monsoon in East Asia.The continual westerly burst andstronger cumulus convection over the equatorial central-western Pacific caused by stronger wintermonsoon in East Asia can respectively excite anomalous oceanic Kelvin wave and stronger atmospheric intraseasonal oscillation in the tropics,then excite the El Nino event through air-sea interction.In El Nino winter,there are warmer and weaker winter monsoons in East Asia.The El Nino will still reduce the intensity of intraseasonal oscillation and leads it to be barotropic structure.  相似文献   

不规则场地上基础的动阻抗及其在入射波作用下的输入运动     

蒋通 《地震工程与工程振动》1996,16(2):25-32

本文根据边界元方法建立了位不规则场上刚体的动阻抗和在入射平面波作用下的有效输入运动的分析模型，分析模型考虑了不规则场地和基础对入射波的散射作用以及土与基础的相互作用，通过验证确认了本方法的正确性，文中计算了凹陷，高地和盆地三种不规则场地土不同条件基础的动阻和有效输入的运动，并与半空间地基上相应基础的情况作了对比，计算表明，当基础尺寸与不规则场地范围可比时有必要用本文模型分析不规则场地的影响和土一结  相似文献   

滇中砂岩铜矿成矿过程中水－岩反应的证据与机理   总被引：4，自引：0，他引：4  

庄汉平  冉崇英  何明勤  卢家烂 《地球科学》1996,(3)

从野外地质产状、岩石化学、有机岩石学、元素地球化学、有机地球化学等方面详细分析了滇中砂岩铜矿成矿过程中的水－岩反应证据，阐明了成矿过程中水－岩反应的机理，其中包括渗滤作用、扩散作用、混染作用、交代作用、交代溶蚀作用、氧化还原作用和沸腾作用  相似文献   

夹皮沟金矿带韧性剪切变形中的水岩反应及物质组分变化规律”   总被引：6，自引：1，他引：6  

孙晓明  徐克勤  任启江  Reid R Keays 《矿床地质》1996,15(4):308-317

夹皮沟金矿北西向剪切带存在着长英质和镁铁质两类糜棱岩系列岩石，韧性变形中伴随的大量流体与糜棱岩之间发生了强烈的水岩反应：斜长石绢云母化和钠化，暗色矿物绿泥石化，以及大范围强烈的碳酸盐化。  相似文献   

有机质在金银低温成矿作用中的实验研究   总被引：7，自引：2，他引：7  

卢家烂  庄汉平 《地球化学》1996,25(2):172-180

本文实验内容包括Ａｕ、Ａｇ元素在低熟高硫原油及其共存的水溶液中的分配特征，水－油－岩（矿）反应体系中Ａｕ、Ａｇ活化和迁移的能力，以及在共同源岩和温度，压力共同作用的压力机系统中，石油生成和初次运移过程对Ａｕ的富集能力等。结果证明，在一定的成熟度范围内Ｒ０〈０．９００％）原油可能成为Ａｕ，Ａｇ运移和富集的重要载体以及成矿流体的重要组成部分。  相似文献   

STUDY ON THE AIR-SEA INTERACTION ON THE INTERANNUAL TIME SCALE IN THE SOUTH CHINA SEA   总被引：2，自引：0，他引：2       下载免费PDF全文

王东晓  周发琇  秦曾灏 《Acta Meteorologica Sinica》1997,(1)

In this paper we document the correlationship between sea surface temperature (SST) and lowlevel-winds such as sea level wind and 850 hPa wind in the South China Sea (SCS) based onCOADS (1958—1987) and ECMWF objective analysis data (1973—1986).Further statisticalanalyses tell us that there is a fixed SCS basin mode for variations both of SST and low-level windsin the region on the interannual time scale due to air-sea interactions.A simplified,coupled model that is designed following the McCreary and Anderson's (1985)model and includes the feedback between the upper ocean and the circulation of East Asianmonsoon demonstrates an interannual oscillation in the coupled air-sea system,which is similar tothe observations in the SCS.  相似文献   

THE UNDERSTANDING OF ENSO CYCLE MECHANISM AND ENSO POTENTIAL PREDICTION ABILITY          下载免费PDF全文

钱维宏 《Acta Meteorologica Sinica》1997,(1)

In recent years,the dynamic coupled models of ocean-atmosphere and statistical models havebeen used in routine operation for issuing long-lead forecasts.The dynamic coupled models consistof models with varying degrees of complexity,ranging from simplified coupled models of theshallow water to coupled general circulation models.During the period of 1980—1992,somemodels performed considerably better than the persistence forecast on predicting typical indices ofENSO for lead time of 6 to 12 months.It seems that ENSO is predictable at least one year inadvance.However.nearly all the models have lost their skill of forecasting sea surface temperature(SST)changes in the eastern equatorial Pacific since 1992.It is a challenge not only to the dynamicmodels but also to the understanding of the ENSO cycle mechanism.This paper examines multipletime-space scales of the ocean-atmosphere interactions and potential prediction ability of ENSOevent by using data analysis and model study.  相似文献   

Groundwater discharge into lakes: A review of recent studies with particular regard to large saline lakes in central Asia   总被引：1，自引：0，他引：1  

I. S. Zekster 《International Journal of Salt Lake Research》1995,4(3):233-249

Groundwater discharge into lakes is one of the least studied components of their water and salt balance. Yet groundwater inflow determines in many cases the hydrochemical, thermal and hydrobiological regimes of lakes and affects the process of sediment accumulation. Modern methods for quantitatively assessing groundwater discharge into lakes are considered. The results of studies of the groundwater contribution to the water and salt balance of Lakes Baikal, Balkhash, Issyk-Kul, the Caspian Sea and some other lakes are given. International experience in studying ground and lake water interaction is briefly characterized.  相似文献