ESTIMATES OF SEA SURFACE FLUXES DURING TOGA-COARE IOP     

Yao Huadong  Li Ji  Ding Yihui 《Acta Meteorologica Sinica》1996,10(2):175-192

With the marine ship observation data set obtained by three cruise-phases of Chinese Xi-angyanghong 5 from November 5,1992 to February 19,1993 in the TOGA-COARE IOP at 2°S,156°E.the sea surface fluxes at this point are estimated by three different bulk schemes.Firstly.aquasi-linear relation is found between the neutral drag coefficients and wind speed.Then,the sta-bility-dependent drag and heat transfer coefficients are solved in the iterative method.Based onthus-derived transfer coefficients,the momentum,sensible and latent heat fluxes are calculated.In the warm pool region,the fluxes corresponding to the westeily winds are much greater thanthose of the easterly trade winds.The magnitude of sea surface fluxes depends upon the atmo-spheric stability as well,in particular in the case of weak wind condition.The estimated sea sur-face net heat budget shows that considerable amount of heat transport from ocean to atmosphere ismainly produced by the effective longwave radiation,latent and sensible heat fluxes.Among themthe value of latent heat flux is the largest and the sensible heat flux is the smallest.Finally,an ac-curacy analysis is made by direct measurements with the eddy-correlation method on the JapaneseR/V Hakuho board at the same time.It is shown that the bulk-derived fluxes are acceptable withmuch confidence.The estimated effective longwave radiation is used to compare with those by di-rect observations on Xiangyanghong 5.This research is compared with TOGA investigation in thetropical western Pacific.  相似文献   

STUDY ON CANONICAL AUTOREGRESSION PREDICTION OF METEOROLOGICAL ELEMENT FIELDS^*     

Ding Yuguo  Jiang Zhihong 《Acta Meteorologica Sinica》1996,10(1):41-51

Through extension of canonical correlation to the analysis of meteorological element fields (MEF), a concept from combination of canonical autocorrelation with canonical autoregression (CAR) is developed for short-term climatic prediction of MEFs with a formulated scheme. Experimental results suggest that the scheme is of encouraging usefulness to a weak persistence MEF,i.e., rainfall field and, in particular, to a strong persistance one like a SST field.  相似文献   

三峡库区紫色土坡地养分状况及养分流失^*   总被引：33，自引：3，他引：33  

蔡崇法  丁树文 《地理研究》1996,15(3):77-84

紫色土是三峡库区移民安置区的主要坡地土壤。本研究采用典型区域调查,代表性土壤剖面养分分析,结合实验小区人工降雨的方法,初步研究了发育于侏罗纪紫色砂泥岩母质上紫色土的养分状况、养分流失特点、过程及影响养分流失因素。  相似文献   

东亚冬、夏古季风变化的相位差及热带太平洋在季风变化中的驱动作用   总被引：9，自引：3，他引：9       下载免费PDF全文

熊尚发  刘东生  丁仲礼 《第四纪研究》1996,16(3):202-210

斋堂黄土剖面古气候记录表明：１)冬、夏季风在千年尺度上的变化存在相位差；２)冬、夏季风记录在变化趋势上具有互为消长的关系，而在变化幅度和频率方面则有明显的差异。这表明，冬、夏季风在千年尺度上的变化是分别由不同的因素和过程所控制。我们提出热带太平洋海气相互作用系统在东亚季风变化过程中起着直接的驱动作用。  相似文献   

Transport of water vapor over North China during the drought period in summer of 1980     

Liu Yongqiang  Ding Yihui  Li Yuehong 《大气科学进展》1992,9(2):213-222

The features of water vapor transport, such as temporal evolution, vertical structure and spatial pattern, over North China during the prolonged drought in the summer of 1980 have been analyzed through computation of water vapor flux based on the once daily ECMWF grid-point data at 12GMT. The results indicate that it is unlikely that the characteristics of the atmospheric mass divergence, ascending motion and stratification stability in North China were completely opposite to those in the Yangtze River Valley, where the heavy flood occurred in the summer of 1980. It is major differences that the strong ascending motion and significant water vapor convergence overlap fairly well each other in the vertical levels in the Yangtze River Valley, while the maximum ascending motion is accompa-nied by water vapor divergence or weak water vapor convergence in North China. This vertical structure in North China results in insufficient water vapor supply and, therefore, little condensation and precipitation in the middle and upper atmosphere were produced. Additionally, a mode of monthly-scale low frequency oscillation can be found in water vapor flux, which is in correspondence to the fluctuation period of rainfall.  相似文献   

An overview of the Madden-Julian oscillation and its relation to monsoon and mid-latitude circulation   总被引：2，自引：0，他引：2  

Bin Wang  Yihui Ding 《大气科学进展》1992,9(1):93-111

In the past decade there has been extensive research into tropical intraseasonal variability, one of the major com-ponents of the low frequency variability of the general atmospheric circulation. This paper briefly reviews the state-of-the-art in this research area: the nature of the Madden-Julian Oscillation, its relation to monsoonal and extratropical circulations, and the current theoretical understandings.  相似文献   

气象场经验正交函数不同展开方案收敛性问题的探讨   总被引：15，自引：0，他引：15  

丁裕国  施能 《大气科学》1992,16(4):436-443

本文从理论上证明EOFs(经验正交函数)用于气象场时,三种不同计算方案特征值的相互关系.指出利用原始场积和矩阵展开的特征值λ_j等于用协方差阵展开的特征值λ_j~*加上平均场方差引起的特征值λ_j.进而论证了收敛速度差舁的原因.最后又以实例表明,不同展开方案的典型场意义及其与时间权重系数的对应关系.  相似文献   

太平洋海温异常对其上空环流影响的分析及数值试验   总被引：5，自引：1，他引：5  

陈月娟  丁明 《大气科学》1992,16(5):592-600

本文首先用《逐月全球气候资料》中的实测风资料对80年代的两次El Nino。事件(1982—1983年和1986—1987年)太平洋地区上空环流的变化情况进行了分析研究,然后用一个九层原始方程模式对其进行数值模拟试验. 观测资料分析及数值模拟结果皆表明,赤道东太平洋的这两次海温异常都使其上空的环流发生明显的变化,但由于两次海温异常的强度、范围和延续时间有所不同,对环流的影响也不相同.本文将简要地介绍这两次El Nio期间太平洋上空环流的演变特征及数值试验的结果.  相似文献   

巴士系构造的地震危险性   总被引：11，自引：6，他引：11  

丁原章  梁劳 《华南地震》1992,12(2):1-14

在北东东向分布的华南地震带内,从巴士海峡到闽粤赣三省交界有呈北西向分布的地震密集带。它与北西向分布的巴士系断裂构造相一致。此组构造与华南地区其他北西向构造的重要区别在于,它起自菲律宾海板块的边缘,其动力主要来自该板块向欧亚板块不均匀的推挤作用。巴士系构造是华南地区新构造活动性最强的构造,沿着此组断裂曾有过大量强烈的地震活(?),包括6级、7级和8级地震。在未来10年内,此带的强震活动有逼近粤东、闽南沿海地区的趋势。  相似文献   

THE RELATIONSHIPS BETWEEN EFFICACY OF GEOELECTRICAL RESISTIVITY METHOD IN EARTHQUAKE PREDICTION AND SITE CONDITION          下载免费PDF全文

Chen Youf  Wang Defu  Zhao Heyun  Jiang Zhixiong  Kang Yunsheng  Ding Hui 《地震工程学报》1992,14(2):98-110

INTRODUCTION In the past two decades, field observation, laboratory experiments, and the theoretical studies in the study on earthquake prediction have been carried out in several countries, by using ρ_s method, and valuable results have been achieved. The first geoelectrical resistivity (ρ_s) observatory for earthquake forecasting established at  相似文献