地震活动的月相效应   总被引：9，自引：4，他引：9  

丁鉴海  黄雪香 《地震》1994,(4):7-13

本文利用中国大陆１９１０年以来６．０级以上和首都圈地区１９６６以来１．０级以上大量地震资料，对地震活动的月相效应进行了研究。结果表明，发生在各个月相上的地震频次明显受月相的调制和制约，并且有一定的规律性，月相效应的最大幅度可影响地震活动平均频次的２５％以上，证明了地震活动的月相效应明显存在，其影响不可忽略。结果还表明，月相效应的基本特征是具有半月和全月周期性，此外，对首都圈地区地震活动以及唐山，邢  相似文献   

A STUDY OF CLOUD-SYSTEM MODEL:MACRO AND MICRO STRUCTURE SIMULATION OF CLOUD FIELD^*          下载免费PDF全文

Xu Huanbin  Ding Zhengping 《Acta Meteorologica Sinica》1994,8(4):488-497

The macro and micro cloud physics structures and their evolution with time are the core of describing cloud fields in essence.They are necessary atmospheric environment not only in aviation and spaceflight activities but also for atmospheric radiation transfer and acid rain formation research.Unfortunately it is difficult to obtain an entire environmental cloud field by using observation methods directly.Thus,by use of computation physics method to build a cloud-systemmodel may be an indispensable way for this topic.This paper presented a cloud-system model for this goal,and simulated a real case.The results of computation showed that the macro structure of the cloud field was better consistent with real observation,and the micro structure was fairly reasonable.The output of model could provide all the information about the cloud field:(1)size-distribution spectrum of hydrometeor particles(point),(2)vertical profile(line),(3)horizontal or vertical section of macro and micro parameters(surface),and(4)cloud cover,pattern of cloud and configuration of cloud,etc.(body).  相似文献   

海洋温带气旋发生发展的研究   总被引：7，自引：0，他引：7  

仪清菊  丁一汇 《大气科学》1989,13(2):238-246

本文综合地评述了近年来海洋温带气旋发生、发展的研究成果,讨论了海洋温带气旋爆发性发展的气候特征、天气形势、各种物理机制及数值模拟的结果,并进一步指出了有待解决的问题。  相似文献   

EL NINO AND THE ANOMALOUS CLIMATE IN CHINA     

Zhao Hanguang  Zhang Xiangong  Ding Yihui 《Acta Meteorologica Sinica》1989,3(4):471-481

The similar features of two El Nino(1982/83 and 1986/88)events in the formation and developmentprocess are revealed based on the analysis of the oceanic and atmospheric data in the present paper Forinstance,the timing of the warming onset and ending was late,the warming region first took place in theequatorial central Pacific,and the propagation of warming event is from west to east.Moreover,it is shownthat the two El Nino events both exerted a significant impact to the strength and the westward extension ofthe subtropical high over the Northwest Pacific.The atmospheric response to this SST anomaly was alsovery marked with the persistent PNA pattern observed in Pacific-North American region.Both events hadthe striking impact on the winter weather process and climate in China,but with considerable differences.On the basis of the analysis of all El Nino events in the recent 40 years,it has been found that the rainfallduring Meiyu period in Changjiang River Basin is associated with the season of El Nino onset.  相似文献   

陕西宁强地区志留纪牙形石及其地层意义   总被引：7，自引：2，他引：7  

丁梅华  李耀泉 《地球科学》1985,(2)

牙形石化石采自宁强大竹坝和二郎坝。共鉴定了30属70形态种,包括2新属13新种。据此与贵州和欧美同期地层对比,建立了二个牙形石组合二个亚组合,自下而上为:1.Spathognathodus parahassi组合,2.Spathognathodus celloni组合,包括二个亚组合:(1)Aulacognathus bashanensis亚组合,(2)Ozarkodina adiutricis亚组合。并对陕西宁强地区的王家湾组,杨坡湾组和宁强组的时代作了讨论。  相似文献   

Temperature changes over Eurasia during the late summer of 1979     

Ding Yihui  T. Iwashim  T. Murakami 《大气科学进展》1985,2(2):200-214

During the late summer of 1979, massive changes occurred in the distribution of temperature over Eur asia north of 15oN. At 300 hPa, zonal mean temperature averaged over Eurasia along 20o－25oN de-creased sharply around 23 August. An abrupt decrease in 300 hPa zonal mean temperature also occurred over extensive mid-latitude zones (40o－55oN) around 18 August, i. e., about 5 days prior to the monsoon withdrawal over South Asia.The intensity and location of N－S oriented, vertical overturning underwent significant changes over Eurasia during the transition from summer to fall. Near 20o－25oN, zonal mean updrafts weakened con-siderably during the transition period (18－27 August). Around 45oN, zonal mean downdrafts and the asso-ciated cooling (radiative) rate increased considerably during the transition period.Near 15oN, 300 hPa zonal mean temperature fluctuated nearly periodically with an approximate 40-day period. These fluctuations appear to be associated with a small imbalance between 40-day filtered adiabatic cooling (heating) and diabatic heating (cooling).  相似文献   

1979年印度夏季风活跃、中断和撤退时期欧亚上空风场和温度场的变化     

丁一汇  村上多喜雄 《气象学报》1984,42(2):198-210

本文对1979年夏季印度西南季风活跃、中断和撤退时欧亚地区大范围环流和温度场进行了分析。结果表明,该年季风活动的变率与欧亚中高纬环流形势的演变有明显关系。季风活跃期,高空西风带显著北移,西藏高原上空有高空反气旋环流建立、发展,苏联西部阻塞高压发展、维持;季风中断期,西藏高原西部有高空槽存在;苏联西部阻塞高压减弱、崩溃或有高空槽发展;季风的撤退也与东亚冷空气活动关系密切。  相似文献   

The sulphur isotope systematics of the Taolin lead-zinc ore deposit,China     

T Ding  C.E Rees 《Geochimica et cosmochimica acta》1984,48(11):2381-2392

Sulphur isotope data from coexisting sulphides and sulphates from the Taolin Pb-Zn ore deposit have been used to estimate the temperatures of sulphur mineral precipitation. The data indicate that sulphide was the dominant sulphur species in solution at high temperatures and that sulphate was dominant at low temperatures. Also the data show that the δ³⁴S value of total sulphur in solution was close to zero at high temperatures (~325°C) but had high positive values (+15%.) at low temperatures (~250°C). We interpret this phenomenon in terms of the effects of mineral precipitation on the isotopic composition of the solution. The increase in the δ³⁴S value of total sulphur with decreasing temperature was brought about by the removal from the system, by precipitation, of isotopically light sulphides.  相似文献   

北半球夏季全球热带和副热带200hPa平均辐散环流的研究   总被引：7，自引：5，他引：7  

丁一汇  赵深铭  张键 《气象学报》1987,45(1):120-127

大气的运动场或风场包括两部分:一是旋转部分,另一是辐散部分。虽然旋转部分的方差占总运动场方差的大部分(约占80％),但与辐散风相联系的垂直环流对于天气系统的发展是重要的。Krishna-murti等人最早研究了全球热带的辐散环流。最近他的研究表明,辐散风场的大部分是属于纬向的行星尺度垂直环流的水平分支,这意味着行星尺度系统总是热力直接环流,并且以纬向环流为主。Van der Boogard计算了7月多年平均的速度势场,发现对流层上层最强的辐散中心在中南半岛上空。  相似文献   

山东角07井注(漏)水诱发地震——地表宏观现象与震群活动特点          下载免费PDF全文

卢守安  苏鸾声  陈正品  陈宝银  邹泉生 《地震地质》1987,9(3):84

本文介绍了1985年底发生在山东胜利油田角07井的一次注水诱发型小震群的活动情况,论述了地表宏观现象,分析与讨论了这次诱发型震群的活动特点  相似文献