SLR资料的快速处理   总被引：3，自引：0，他引：3  

冯初刚  朱元兰  张飞鹏 《测绘学报》2001,30(3):226-232

详细地介绍了 SL R( Satellite L aser Range)资料的快速分析处理技术。SLR资料的分析处理方法、采用的力学模型和解参数的多少根据目标的不同而异。但是其关键是对 SLR卫星进行精密定轨。本文对此进行了详细分析、比较 ,得出了目前上海天文台已采用的解算模式。根据该解算模式 ,我们分析处理了 1 998年 1 2月 31日至 1 999年 6月 2 9日 ,每 3天一弧段的 ,L AGEOS卫星的 SLR资料。结果显示每 3天弧段的定轨的残差的 rms约为± 1 cm左右。  相似文献   

Relationship between thermally forced surface wind and sea surface temperature gradient     

P. C. Chu 《Pure and Applied Geophysics》1989,130(1):31-45

An important part of the influence of the oceans on the atmosphere is through direct radiation, sensible heat flux and release of latent heat of evaporation, whereby all of these processes are directly related to the surface temperature of the oceans. A main effect of the atmosphere on the oceans is through momentum exchange at the air-ocean interface, and this process is directly related to the surface wind stress. The sea surface temperature (SST) and the surface wind stress are the two important components in the air-ocean system. If SST is given, a thermally forced boundary layer atmospheric circulation can be simulated. On the other hand, if the surface wind stress is given, the wind-driven ocean waves and ocean currents can be computed.The relationship between SST and surface wind is a coupling of the atmosphere and the oceans. It changes a one-way effect (ocean mechanically driven by atmosphere, or atmosphere thermally forced by oceans) into two-way air-sea interactions. Through this coupling the SST distribution, being an output from an ocean model, leads to the thermally forced surface winds, which feeds back into the ocean model as an additional forcing.Based on Kuo's planetary boundary layer model a linear algebraic equation is established to link the SST gradient with the thermally forced surface wind. The surface wind blows across the isotherms from cold to warm region with some deflection angle to the right (left) in the Northern (Southern) Hemisphere. Results from this study show that the atmospheric stratification reduces both the speed and the deflection angle of the thermally forced wind, however, the Coriolis' effect increases the wind speed in stable atmosphere (Ri>10^–4) and increases the deflection angle.  相似文献   

安徽伏川蛇绿岩套的Nd-Sr-O同位素研究   总被引：13，自引：1，他引：13       下载免费PDF全文

沈渭洲  邹海波  楚雪君  周新民  杨杰东  王银喜 《地质科学》1992,(4):333-341

安徽歙县伏川的蛇绿岩套形成于中-晚元古宙,其Nd、Sr和O同位素组成是:ε_Nd(T)=+0.7-+3.8,ε_Sr(T)=+30.7-+53.9,δ¹⁸O=3.2-11.0‰。据地质学和同位素地球化学特征,该岩套位于杨子板块南缘、江南古岛弧的弧后小洋盆地轴部。ε_Nd(T)值的变化是由于蛇绿岩形成过程中受到下伏不成熟硅铝质基底地壳的混染引起的;ε_Sr(T)和δ¹⁸O的变化,是在蛇绿岩形成时或形成后不久遭受海水热液蚀变的结果。  相似文献   

热水溶液中硫代硫酸盐分子内硫同位素的交换          下载免费PDF全文

储雪蕾 《地质科学》1993,28(4):390-394

分子内不同结构位置上两个同种元素的原子间的直接同位素交换,服从假一级化学反应速度定律。这两位置原子间的同位素交换分数F仅为反应时间t的函数,且有ln(1-F)=-(k_f+k_r)_t。由此分析Uyama等(1985)的实验结果,表明热液中硫代硫酸盐(HSSO₃H)分子内-SO₃H和-SH之间的直接硫同位素交换很慢,它们之间实际存在的较快速同位素交换是通过与硫化物反应形成多硫化物这个可逆反应来实现的。  相似文献   

稳定同位素交换反应动力学     

储雪蕾 《地球科学进展》1994,9(1):69-70

稳定同位素交换反应动力学储雪蕾（中国科学院地质研究所１０００２９）关键词稳定同位素地球化学，同位素交换反应，化学反应动力学稳定同位素（如氢、碳、氧和硫等）被广泛用于地学研究中，它们或作为示踪剂指示物质来源，或作为温度计用来讨论地质体形成温度或地质作用...  相似文献   

地下核爆炸作用下岩石物理力学性质的变化特征   总被引：2，自引：1，他引：2  

褚玉成  陈剑杰 《工程地质学报》1994,2(4):54-58

对地下核爆炸岩石介质爆前爆后的一些物理、力学和声学参数进行了室内测试，发现它们呈规律性地变化，还分析和讨论了变化的机制。  相似文献   

面向对象的电子地图创作模型—国家经济地图集（电子版）软件设计研究   总被引：10，自引：1，他引：10  

初世强  刘岳 《地理学报》1996,51(1):12-24

本文系统地描述了电子地图创作系统ＭａｐＭａｇｉｃ的设计思想和实现技术。文章根据电子地图的新特点，运用面向对象的方法技术提出了电子地图的概念模型，并给出了其计算机形式化表示－电子地图模型。在此基础上，研究地图创作的任务，建立起面向对象的电子地图创作模型，并详细讨论了该创作模型的体系结构、组成要素及其实现机制。按照上述思想设计的ＭａｐＭａｇｉｃ软件系统应用到《中华人民共和国国家经济地图集》（电子版）开  相似文献   

Crustal movements along a collision boundary of plates (case of Eastern Taiwan)     

M. Kosuga  H. Sato  T. Tanaka  Hwa Chu Sheu 《Journal of Geodynamics》1988,9(2-4)

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An instability theory of air-sea interaction for coastal upwelling     

P.C. Chu 《大气科学进展》1988,5(3):277-286

A surface wind (seabreeze), thermally generated by differential sea surface temperature, is introduced to Gill-Clarke’s model (1974) through wind stress for investigating the effects of Seabreeze on coastal upwelling. A coupled air-sea system is treated as an eigenvalue problem. The solutions show that the thermally forced local winds break down the coastal Kelvin wave into three parts: small-scale (L<100 km) growing and stationary modes, mesoscale (100 km200 km) coastal Kelvin modes. The consistency of the length scale between the most growing mode predicted by this model and the observed cold/warm alternation pattern of surface water near the Peruvian Coast (around 15oS) implies that Seabreeze may play some role in coastal upwelling.  相似文献   

A Post-Processing Method for the Removal of Refraction Artifacts in Multibeam Bathymetry Data   总被引：2，自引：0，他引：2  

Fanlin Yang  Jiabiao Li  Ziyin Wu  Xianglong Jin  Fengyou Chu  Zhongzhi Kang 《Marine Geodesy》2007,30(3):235-247

Sound refraction artifacts are often present in multibeam swath bathymetry data. For a flat array, the artifacts are usually more serious in outer beams than in inner beams. In a 3D topographical mapping they appear as ridges that parallel the tracks of the vessel. To shorten the survey time, the outer beams should be utilized as often as possible. Therefore, the refraction errors should be removed. In this paper, we present a model of reduced sound speed profile that consists of three water layers. The sound speed of the two upper layers has a constant gradient, and the third layer has the same sound speed as the most bottom measured layer. The model parameters can be searched based on the principle of the minimum difference of depth between the overlap of two neighboring swaths. The horizontal position and depth of each beam can be accordingly recalculated using the model parameters. To avoid being trapped in local optimum, the initial search scope is limited according to assumed lunch angle and travel time in each subregion. The method is verified by comparing the simulated and real data.  相似文献