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甘雨  隋立芬  张清华  桑渤 《大地测量与地球动力学》2013,33(1):108-112

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Investigation of dynamic processes in the period of formation and development of the blocking anticyclone over European Russia in summer 2010     

P. N. Vargin  A. N. Luk’yanov  A. V. Gan’shin 《Izvestiya Atmospheric and Oceanic Physics》2012,48(5):476-495

The blocking anticyclone (BA) observed in the summer of 2010 over the European part of Russia led to enormous economical damage, substantially increased the mortality of the population, and had serious negative consequences for human health. Dynamic processes in the troposphere, i.e., wave trains, which could contribute to anticyclone formation and sustenance, are investigated. In order to study these wave trains, three-dimensional Plumb vectors have been calculated and analyzed. It is shown that, in June 2010, three wave trains propagated eastward in the troposphere over the Atlantics. The first two wave trains, having reached Europe, continued to propagate in eastern and southeastern directions. Only the third wave train, upon reaching Europe, continued to propagate toward the northeast and, on June 17–19, entered northwestern Russia. The anticyclone, which started to form on June 18 precisely in this region, subsequently developed into a stable BA observed over European Russia up to mid-August. The propagation direction of the wave trains could change due to the formation of a double structure of the zonal flow in the troposphere. The wave trains are revealed in the middle of June in regions with increased cloudiness over the northwestern part of the Atlantic Ocean and over the northwestern and northern parts of the central United States. Eastwardpropagating wave trains, which could contribute to the intensification of the corresponding BAs that brought anomalously high temperatures to European Russia, were also revealed in July and August of 2010 and 1972. The calculated 10-day backward trajectories are analyzed to determine the character of motions of air particles that penetrated into the anticyclone over the region of Moscow during the 2010 summer in the period of its development.  相似文献   

Observational Studies of the X-Ray Quasi-Periodic Oscillations of a Solar Flare     

Y. P. Li  W. Q. Gan 《Solar physics》2008,247(1):77-85

We study an M2.6 flare observed with RHESSI on 22 August 2005. The light curves of the hard X-rays (counts and photon fluxes), the derived number fluxes, as well as the energy fluxes of energetic electrons all presented a damped quasi-periodic oscillation. The modulation depth of the hard X-rays increased with the energies. For the energy fluxes of energetic electrons, the modulation depth can be as high as 90%. During the oscillations, however, the plasma temperature had no apparent change. No correspondence was found between the motions of the flare loops and the quasi-periodic oscillations. We conclude that an oscillation with a high modulation depth for a period of about four minutes cannot be easily explained with the existing mechanisms.  相似文献   

基于坡耕地与聚落空间耦合的三峡库区腹地奉节县人地关系研究     

甘彩红  李阳兵  陈萌萌 《地理研究》2015,34(6):1259-1269

以三峡库区腹地奉节县的27个乡镇为例,应用网格分析技术,以1km×1km网格为单元,揭示了聚落与坡耕地资源之间的配置关系以及不同岩性区聚落-坡耕地耦合模式差异,并对研究区人地关系做了类型划分。结果表明：①奉节县27个乡镇聚落和坡耕地的空间分布表现出较强的空间趋同性,二者用地比、斑块等级大小高值都主要位于北部梅溪河河谷和中部长江河谷地区,低值主要分布于南部石灰岩地区;②坡耕地偏多型主要分布于砂岩区,坡耕地偏少型主要分布于石灰岩区,而坡耕地-聚落均衡型则表现出随机分布格局;③研究区坡耕地大量存在的原因主要归结于坡耕地基数大和坡耕地退耕难度大。受坡耕地分布的影响,坡耕地偏多型的土壤侵蚀较其他耦合类型严重;④27个乡镇人地关系划分为人地矛盾突出型、人地矛盾较突出型、人地矛盾较缓和型和人地矛盾缓和型四种类型,而人地矛盾较突出类型所占比重最大,面临着退耕压力和耕地压力突出的双重问题。  相似文献   

地应变计算Delaunay三角网在MATLAB与GMT环境下的相互转换     

肖根如  甘卫军  陈为涛 《大地测量与地球动力学》2010,30(3)

地壳应变率计算的传统方式是将GPS站点组成三角形进行计算,因Matlab与GMT在构造Delaunay三角网时采用不同的算法,对于同一套数据生成结果有明显的差异.通过研究Matlab与GMT构建三角网结果输出的数据格式,利用Perl语言编写程序将两套结果进行转换,实现Matlab与GMT软件在绘制Delaunay三角网时的相互转化并构建同样的三角网结果,绘图时再结合GMT的地形底图,取得了较好的表达效果.  相似文献   

Isotherm Study of Phosphorus Uptake from Aqueous Solution Using Aluminum Oxide     

Liang Zhang  Song Hong  Jing He  Fuxing Gan  Yuh‐Shan Ho 《洁净——土壤、空气、水》2010,38(9):831-836

Aluminum oxide, which could be an alternative filter media for phosphorus uptake from aqueous solution, was selected as an adsorbent for the isotherm study of phosphorus uptake from aqueous solution. Batch method was adopted to investigate the adsorption behavior of phosphorus onto aluminum oxide. The Langmuir, Freundlich, and Redlich–Peterson isotherms were used to analyze the experimental data by both the linear and nonlinear regression methods. The adsorption experiment was conducted at various temperatures, to choose the appropriate method and obtain the creditable adsorption parameters for phosphorus uptake studies. The results indicated that the nonlinear regression method might be a better way to compare the best‐fitting isotherm and obtain the parameters for the adsorption of phosphorus onto aluminum oxide. Both the Redlich–Peterson and the Freundlich isotherms have high coefficients of determination for the adsorption of phosphorus onto aluminum oxide at various temperatures. In addition, a new relationship between the Redlich–Peterson and the Freundlich isotherm parameters was presented.  相似文献   

5·12汶川地震前后鲜水河断裂运动状况的变化——基于跨断裂连续GPS观测的认识     

甘卫军  王敏  陈为涛  肖根如 《国际地震动态》2010,(6):10-11

鲜水河断裂作为青藏高原东南部现今运动最为强烈的活动构造,因历史上一系列大震(如1786年康定7级地震、1816年炉霍7级地震和1973年炉霍7.6级地震等)的发生而一向备受关注。本文基于跨越鲜水河断裂道孚段和干宁段的两条密集型GPS剖面自2005年以来的高精度地壳运动观测资料(其中4站为连续GPS观测,23站为每年一期的非连续GPS观测),揭示出鲜水河断裂在汶川8.0级地震之前,一直保持着强烈而稳定的左旋(~10.4±1.0mm/a)兼轻微拉张(~0.3±1.2mm/a)运动。汶川地震的发生,使鲜水河断裂干宁段和道孚段近断层两侧分别发生了量值达13mm和4mm的侧向拉伸,并使干宁—道孚段发生了量值达2.5~10mm的右旋位错,因此,对其现今的左旋运动方式施加了短暂的反向抑制,但汶川地震后,鲜水河断裂的运动状况很快恢复了以往的态势。我们的研究结果表明,汶川地震的发生,使鲜水河断裂的应变积累有所消减,故在一定程度上降低了该断裂未来的地震危险性水平。另外,青藏高原东南部的GPS速度场和鲜水河断裂两侧的应变分析显示,鲜水河断裂所表现的强烈左旋差异运动是由其南侧"流滑带"的东南向逃逸远大于北侧松潘地块的轻微东南向运动所致。  相似文献   

利用地震烈度数据重构历史地震震级和震中位置的方法   总被引：1，自引：1，他引：0       下载免费PDF全文

马干  张杨  史保平 《地球物理学进展》2010,25(1):124-133

采用现代仪器地震记录和烈度资料,我们建立了用于定量估算历史地震震级和震中位置的烈度衰减模型和分析方法,并对我国西南川滇地区的历史和近代地震的震中和震级进行了重新分析.利用20世纪以来该地区十四个有仪器记录的地震（5.9≤M_s≤8.0）及相应的烈度数据,对其烈度-震级-震中距衰减关系进行标定,并建立了用于震中和震级估算的烈度衰减模型.结果表明,当震级一定时,川滇地区烈度随震中距增大而衰减的速率明显小于美国加州地区（～60%）.在衰减模型基础之上,发展了确定震中区域和震级的网格搜索试算方法（GSTSL）,并给出了确定震中位置和震级的等值线置信值.采用所建立的分析方法,对1786年康定地震,1850年西昌地震,1913年峨山地震和1970年通海地震进行了分析,给出了更为精确合理的结果.  相似文献   

Establishment and adjustment of monsoon-driven circulation in the South China Sea   总被引：2，自引：0，他引：2  

王东晓  王卫强  施平  郭佩芳  甘子钧 《中国科学D辑(英文版)》2003,46(2):173-181

The South China Sea (SCS) is one of the large marginal seas of the western Pacific Ocean. In comparison with open oceans, the SCS circulation has obviously transient characteristics due to its small basin-scale and semi-annually reversed monsoon forcing. …  相似文献   

鄂西和滇西孕震深部构造变异的对比研究     

朱思林  甘家思  徐菊生  申重阳 《大地测量与地球动力学》1995,(3)

根据最新精细重力异常场及其三维反演结果，用类比法研究了鄂西与滇西两区域各波长重力场变异特征和地壳层间结构差异，并对重点监测区危险地段划分所需的深部构造信息和动力学特征进行了探讨。  相似文献