1989年中日青藏高原冰川联合考察研究   总被引：3，自引：1，他引：3  

姚檀栋  上田丰 《冰川冻土》1991,13(1):1-8

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萨拉乌苏河地区地层中的碎屑矿物及其所反映的中更新世末期以来之气候环境变化   总被引：2，自引：0，他引：2       下载免费PDF全文

李保生  董光荣  高尚玉  丁同虎  申建友  邵亚军 《岩石矿物学杂志》1991,10(1):84-90

文章根据对萨拉乌苏河地区第四纪地层中的碎屑矿物分析结果,将重矿物按其抗化学风化的能力不同分为不稳定、较稳定、稳定和极稳定四种类型,不同层位的重矿物类型的百分含量不同,从而可求出重矿物的风化系数HW。不同时期地层的HW不同,而HW的大小变化与化学风化的程度有很大关系,一般来说,化学风化作用强,HW相应变小。而化学风化作用的强弱又主要受气候的影响,从而可推测该时期气候环境的变化。  相似文献   

时序分析在危岩体监测数据处理中的应用     

陈德豪  丁窘辋 《武汉大学学报(信息科学版)》1994,(3)

引入时间序列分析进行危岩体监测数据的处理，建立了危岩体变形的动态模型，取得了较好的拟会与预报精度。  相似文献   

一次东亚寒潮爆发后冷涌发展的研究   总被引：10，自引：0，他引：10  

丁一汇  蒙晓 《气象学报》1994,52(4):442-451

分析了１９８１年１月２１—２８日一次东亚强寒潮爆发后南海和西太平洋地区冷涌的发展过程。冷涌的发展最先表现为低层强东北风沿东亚沿海地区和南海中北部的迅速建立。２—３ｄ之后，又在菲律宾以东洋面激起第二次冷涌。与冷涌相伴随的低层温度场变化也十分明显，同样具有先后两次降温过程。冷涌期高空风场表现有明显的脉动，南海北部高空西风迅速减弱，而在南海近赤道地区出现了很强的高空东风区。冷涌的发展与寒潮冷高压的南下有密切关系，它的强度在很大程度上取决于中纬度冷高压的强度。另一方面，冷涌发展后，通过Ｈａｄｌｅｙ环流可影响中纬西风急流和热带东风急流的变化。  相似文献   

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