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   

热-破裂模式讨论          下载免费PDF全文

魏柏林 《地震工程学报》1985,7(2):106-108

任何解释地震发生过程的模式,必须要能说明各种与孕震有关的前兆观象。目前,膨胀—扩散模式在解释波速比的变化方面是比较成功的,但是对地壳的各种类型的形变、地温的变化、震源机制解中主压应力轴的转向或变化、发震构造型式等都不能在此模式中求得答案,因此,有必要提出更合理的模式来解释上述现象。  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   

鄂西利川晚二叠世生物礁中串管海绵(Sphinctozoa)化石的新发现          下载免费PDF全文

张维 《地质科学》1985,(4):364-374

湖北省西部利川县境内的上二叠统发育有我国最典型的生物礁。礁体产于长兴组二段(含古纺锤(竹蜓) Palaeofusulina 带),以见天坝一带出露最佳。1977—1978年,江汉石油学院刘怀波、高振中等报道了黄泥塘生物礁的发现,并对该区生物礁的组成、形成环境提出了看法。1980—1982年,中国科学院地质研究所、四川石油管理局地质勘探开发研究院、江汉石油学院及江汉石油管理局等曾先后赴见天坝考察,并分别进行深入详细的研究,一致确认该区生物礁是以钙质海绵为主要造架生物的、晚二叠世碳酸盐台地边缘生物礁。  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   

Determination of atmospheric precipitable water and humidity profiles by a ground-based 1,35 cm radiometer     

Wei Chong  Xue Yongkang  Zhu Xiaoming  Zou Shouxiang 《大气科学进展》1984,1(1):119-139

In four seasons of 1982 measurements of atmospheric water vapor profiles and total precipitable water were made by a ground-based microwave radiometer operating at 1.35 cm wavelength. All data were processed by using Monte Carlo method. The statistical results of more than seventy cases show that the relative error compared to the radiosonde observations is 5.3% for the total precipitable water vapor and less than 20% for humidity profiles in the lower atmosphere below 750 mb. In addition, the relationship between the weather background and both the humidity profiles and the total precipitable water vapor were analyzed.  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   

上海地区雨水酸度与天气背景的关系   总被引：1，自引：1，他引：1  

邵德民  张维  沈爱华 《大气科学》1987,11(1):79-87

1981—1983年在上海地区11个观测站进行了雨水pH值观测,取到资料2448份.从资料分析得到:(1)雨水pH值与天气背景有关,静止锋天气影响时,酸雨出现几率达44.5％,雨水较酸;暖锋天气时,酸雨出现几率仅9％.(2)台风、高压边缘天气影响下,酸雨的形成主要是受局地污染源的影响;但静止锋、冷锋、低压系统天气时,酸雨的形成不仅受局地污染源的影响,而且还可能受随气流输送来的外来污染物的影响.  相似文献