澜沧—耿马震区构造能流图象研究   总被引：1，自引：0，他引：1  

周瑞琦  李世成 《地震研究》1996,19(2):168-174

根据澜沧－耿马震区构造能流图象的研究，其结果表明震产生了两条长度分别为４２公里、５５公里的北西向主破裂，同时产生了几北东－近南北向的次级破裂。通过与宏观资料的对比，可观看出构造能流图象和震害分布具有较好的一致性。  相似文献   

太阳活动上升期源表面太阳风质量流量的速度关系分析          下载免费PDF全文

魏奉思  周清军 《地球物理学报》1996,39(Z1):1-6

以ＩＰＳ速度、光球磁场、Ｋ─日冕偏振亮度和卫星实地观测数据为基础，综合生成处于太阳活动上升期的１９７６年１０个太阳周（１６４３─１６５２卡林顿周）的源表面高度（Ｒ＝２．５Ｒ_ｓ，Ｒ_ｓ为太阳半径）和日球空间中（ＩＡＵ）太阳同质量流量速度谱。结果表明，速度谱存在与太阳活动上升期一致的＂三段＂结构，且各段分别与不同的磁结构区相对应。  相似文献   

热桩与空气间的对流换热规律研究   总被引：3，自引：0，他引：3  

吴青柏  梁素云 《冰川冻土》1996,18(1):37-42

通过低温室内试验研究热桩与空气间的对流换热规律结果表明，热桩的热流量和放热系数随气温、风速的变化而变化，但因冷凝器特定外形热阻及热桩内凝结换热的影响，气温大于－１２℃和风速大于２ｍ／ｓ时，热桩与空气间的对流换热效率降低。  相似文献   

An analysis of MONTBLEX data on heat and momentum flux at Jodhpur     

Kusuma G. Rao  R. Narasimha  A. Prabhu 《Journal of Earth System Science》1996,105(3):309-323

Parameterization of sensible heat and momentum fluxes as inferred from an analysis of tower observations archived during MONTBLEX-90 at Jodhpur is proposed, both in terms of standard exchange coefficientsC _H andC _D respectively and also according to free convection scaling. Both coefficients increase rapidly at low winds (the latter more strongly) and with increasing instability. All the sensible heat flux data at Jodhpur (wind speed at 10 m Ū₁₀ < 8 ms⁻¹) also obey free convection scaling, with the flux proportional to the ‘4/3’ power of an appropriate temperature difference such as that between 1 and 30 m. Furthermore, for Ū₁₀ < 4 ms⁻¹ the momentum flux displays a linear dependence on wind speed.  相似文献   

Estimation of surface heat flux and inversion height with a Doppler acoustic sounder     

L. K. Sadani  B. S. Murthy 《Journal of Earth System Science》1996,105(3):289-307

In this paper, acoustic sounder (sodar) derived vertical velocity variance (σ _w ² ) and inversion height (Z _i) are used to compute the surface heat flux during the convective activity in the morning hours. The surface heat flux computed by these methods is found to be of the same order of magnitude as that obtained from tower measurements. Inversion heights derived from sodar reflectivity profiles averaged for an hour are compared with those obtained from the σ _w ² /Z profile. Variation of σ _w ² in the mixed layer is discussed. The data were collected during the Monsoon Trough Boundary Layer Experiment 1990 at Kharagpur. The analysis is made for four days which represent the pre-monsoon, onset, active and relatively weak phases of the summer monsoon 1990. The interaction of the ABL with the monsoon activity is studied in terms of the variation of inversion height, vertical velocity variance and surface heat flux as monsoon progresses from June to August.  相似文献   

辐散风和瞬变的涡度通量的异常对定常波年际异常的强迫作用   总被引：2，自引：4，他引：2  

耿全震  黄荣辉 《气象学报》1996,54(2):132-141

研究了１９８２／１９８３年１２—２月对流层上层由辐散风和瞬变的涡度通量所产生的涡度源异常对定常波异常的强迫作用。结果表明，瞬变的涡度通量辐合的异常有抵消或耗散辐散风产生的涡度源异常的趋势；定常波的异常是在这两种强迫力的共同作用下维持的。同时还表明，对１９８２／１９８３年的情况，热带和赤道中东太平洋上的涡度源异常以及中纬度北太平洋上的涡度源异常都对太平洋／北美地区的大气环流异常起了重要的作用。  相似文献   

CHARACTERISTICS OF MESOSCALE FLOOD-MAKING TORRENTIAL RAIN SYSTEM SIMULATED BY HIGH RESOLUTION LIMITED AREA MODEL—NUMERICAL SIMULATION OF A HEAVY RAIN PROCESS DURING MEIYU SEASON IN 1991   总被引：1，自引：0，他引：1  

朱禾  E.Rasmussen 《Acta Meteorologica Sinica》1996,(3)

An experimental work on the transplant of high resolution limited area model(HIRLAM) isfirstly introduced into China.For the implementation,first of all is to adjust a new geographicalcoordination and to remove the instability caused by the Tibetan Plateau,the roof of the world.Then,we have applied this model to simulate a flood-making torrential rain process which occurredin the Changjiang-Huaihe River Valley in July 1991.That revealed the formation,development andmovement of a mesoseale heavy rain system which had made a disastrous flood event in the middleand lower reaches of Changjiang River Valley.The result encourages us to use the HIRLAM for the researches on the Meiyu belt,the salientfeature of precipitation of East Asia,and the numerical prediction of heavy rains in China.  相似文献   

水汽输送的算法精度与模式暴雨预报能力的对比分析     

李峰  葛孝贞 《南京气象学院学报》1996,19(4):482-486

利用中尺度模式ＭＭ４，研究了中尺度模式的暴雨模拟对于不同不汽输送方案的敏感性。采用５种平流差分格式来计算水汽的水平输送，用该模式对３次暴雨过程作了数值试验。并把不同方案的降水模拟结果与实况进行了对比。结果表明，中尺度模式的暴雨模拟对水汽输送方案十分敏感，正定高精度的Ｐｒａｔｈｅｒ格式的模拟结果最接近实况。  相似文献   

冷涡条件下雹云的雷达回波分析及冰雹预报   总被引：5，自引：0，他引：5       下载免费PDF全文

金伟福  刘敦训 《气象》1997,23(11):46-51

利用一次冷涡南下引起的两次强对流天气的数字化雷达回波资料，结合黄河三角洲地区的天气学资料，对比分析了两交冰雹及冰雹和暴雨回波的异同点，为强对流天气的临近预报和人工防雹提供参考。  相似文献   

夏季青藏高原下垫面感热异常的诊断研究   总被引：15，自引：6，他引：15  

李栋梁  章基嘉 《高原气象》1997,16(4):367-375

  相似文献