龙门山断裂带隆起造山独特性探讨   总被引：1，自引：0，他引：1       下载免费PDF全文

郭晓玉  高锐  Keller G R  沙爱军  徐啸  王海燕  李文辉 《地质科学》2014,49(4):1337-1345

龙门山断裂带位于四川盆地西缘;青藏高原东部;为四川盆地与松潘-甘孜地块的接触构造边界。龙门山地区海拔从东侧100 km外四川盆地的500 m突升至3 000 m高度;明显地标注了青藏高原的东部边界;其隆升机制也引起了国内外地质工作者的广泛兴趣;并且提出了多种隆升机制模型。在本次研究中;我们利用SinoProbe-02深反射地震剖面数据对龙门山地区的隆升机制进行研究;从而进一步探讨龙门山地区隆起造山的独特性;并讨论其与传统意义中的造山带的区别;认为龙门山断裂造山带为板块内部构造活动引起岩石圈隆起所形成的。本文的研究结果将使我们更深刻地了解龙门山地区的构造活动特点;并且有助于了解青藏高原东缘对印度-欧亚板块碰撞的构造响应。  相似文献   

基于PPP技术的震后台站位移监测与分析     

张明  王莎 《测绘信息与工程》2012,37(1):12-14,42

利用动态精密单点定位技术,分析了日本仙台大地震对日本及中国境内若干GPS基准台站的影响。结果表明,采用动态精密单点定位技术能准确地反映GPS台站的受损程度,有效地探测地震发生时刻及其震后位移。  相似文献   

安徽省会经济圈碳排放强度与生态补偿研究   总被引：2，自引：0，他引：2  

孙贤斌  傅先兰  倪建华  赵彤 《地域研究与开发》2012,31(1):135-138,155

通过对1997年和2007年碳排放强度分析,揭示安徽省会经济圈内各市县对碳排放的影响和区域差异,根据相关固碳价格计算省会经济圈市县的生态补偿标准。研究结果显示:(1)省会经济圈总体上为碳汇区,1997—2007年间碳排放总量增加1 049.9万t,年均增长14.4%,其中,合肥市碳排放量增长最大。(2)2007年经济圈内地均建设用地碳排放强度和地均碳排放强度分别增加为1997年的2.18,2.41倍。1997—2007年,省会经济圈内的碳排放量、地均碳排放强度和地均建设用地碳排放都呈现合肥市>巢湖市>六安市。(3)经济圈内各县市地均碳排放强度差异显著,建设用地平均碳排放强度以合肥市最高(784 t/hm2),其次是霍山县和金寨县,其他区域的建设用地平均碳排放强度相差不大。(4)2007年合肥市提供的生态补偿标准是12.8～105.1亿元,六安市和巢湖市得到的生态补偿标准范围分别为31.9～278.1,0.6～13.8亿元;各县市生态补偿差异也很大。  相似文献   

TEC Compensated Inversion Method of Ionospheric Occultation     

Zhao-Lin Liu  Xue-Jin Sun  Yang Fu 《Chinese Astronomy and Astrophysics》2009

For the inversion of ionospheric occultation data, the Abel inversion method of calibrated TEC is usually adopted, but the spherical asymmetry of the real ionosphere will bring errors to the inversion result of electron densities. This paper studies a TEC compensated inversion method. By combining with a background field, this method may eliminate the effect of the horizontal variability of electron density on the TEC, and improve the applicability of the assumption of spherical symmetry as well as the inversion accuracy. Applying this method to the inversion of simulative occultation events, the result demonstrates that compared with the traditional Abel transform inversion, the TEC compensated inversion method can reduce the inversion error. Comparing the various background fields obtained in different ways, it is shown that the higher the coincidence level between the background field and the real field, the better the inversion result.  相似文献   

Emission of fine organic aerosol from traditional charcoal broiling in China     

Ximei Hou  Guoshun Zhuang  Yanfen Lin  Juan Li  Yilun Jiang  Joshua S. Fu 《Journal of Atmospheric Chemistry》2008,61(2):119-131

The indoor PM_2.5 aerosol samples for charcoal broiling source under Chinese traditional charbroiling and the ambient fine aerosols samples (PM_2.5) were collected in Beijing to investigate the characteristics of the charcoal broiling source and its impact on the fine organic aerosols in the atmosphere. The concentrations of 20 species of the trace organic compounds, including polycyclic aromatic hydrocarbons (PAHs), fatty acids, levoglucosan, and cholesterol in PM_2.5 were identified and quantified by GC/MS. The total PAHs and fatty acids emitted from charcoal broiling to PM_2.5 were 8.97 and 87,000 ng mg⁻¹ respectively. The concentrations of the light molecular weight (LMW) 3- and 4-ring PAHs were much higher than those of the high molecular weight (HMW) 5- and 6-ring PAHs. Fatty acids were the most abundant species in source profile, accounting for over 90% of all identified organic compounds. More polyunsaturated fatty acid (linoleic acids) than the saturated fatty acid (stearic acids) emitted in the cooking. Charcoal broiling is a minor source of PAHs compared to the source of biomass burning. Comparing the ratios of levoglucosan/fatty acid and levoglucosan/cholesterol in the charcoal broiling samples to the ambient samples, it is evident that meat cooking is an important source of fatty acids, but a less important source of cholesterol. Cooking, as one of the source of fine organic particles, plus other anthropogenic sources would be related to the formation of the severe haze occurred and spread over the urban atmosphere in most of the cities of China in the past several years.  相似文献   

掩星接收机误差对大气温度反演精度影响仿真研究   总被引：1，自引：0，他引：1  

王也英  杜晓勇  符养  林龙福  严卫 《气象学报》2008,66(1):101-110

为了评估掩星接收机误差对无线电掩星探测精度的影响,利用EGOPS软件仿真研究了多普勒偏差、多普勒频移、时钟稳定性/单差分、接收机噪声和局部多路径等对GNSS无线电掩星反演大气温度、折射率、密度、压力廓线的影响.模拟设计过程中选择METOP作为接收的LEO卫星,GPS星座作为发射系统,设置GRAS天线.从模拟的567个掩星事件中选择了一个上升掩星事件和一个下降掩星事件进行模拟分析.研究结果表明:对于设置的"最差"情况,温度误差最大值大部分出现在平流层顶附近,其中多普勒偏差引起的温度误差最大值接近2 K,多普勒频移引起的温度误差最大值小于0.3 K,时钟稳定性/单差分引起的温度误差最大值接近3 K,现实接收机噪声引起的温度误差最大值超过了4 K,局部多路径引起的温度误差最大值小于1.5 K.经讨论分析认为:对于高质量的无线电掩星反演,掩星接收机误差源中最主要的是接收机热噪声、时钟稳定性/单差分和多普勒偏差.文中还随机选取了30个掩星事件进行统计分析,将其温度反演结果与ECMWF分析场数据比较得出,温度误差的平均偏差在45 km高度上最大,约为1 K;最大标准偏差出现在平流层顶,约为5 K,这验证了廓线反演算法的有效性,表明了误差分析结果的正确性和普遍性.  相似文献   

民用炸药库防雷地网分析   总被引：1，自引：1，他引：0  

黄君健  傅俊霖  何肖珍  林铂岷 《气象研究与应用》2008,29(4):62-64,67

以一种较为简单可行的计算方法,对炸药库在复杂土壤环境下的防雷地网进行设计计算,并通过对新建炸药库接地工程前期设计和施工资料对比验收实测值,验证该设计计算方法的可行性。  相似文献   

雁山楝树物候对气候变暖的响应   总被引：4，自引：3，他引：1  

夏小曼  李耀先  符合  谢少凤  李莉 《气象研究与应用》2010,31(3)

对桂北地区雁山气温等气候要素与楝树5个物候期的多年同步观测资料的对比分析,结果表明:(1)桂林雁山近34a来年平均气温呈显著上升趋势,特别是1997年以来增温特明显,在增温过程中以春季增温为主,冬季和秋季增温次之,夏季呈弱降温趋势;(2)近10a来雁山楝树展叶盛期、开花盛期表现为一致的提前趋势,叶全变色期和落叶始期表现推迟的趋势,整个绿叶期延长,果成熟期表现推迟;(3)2月平均气温(T2)和1～3月均温(T1-3)是影响楝树展叶盛期、开花盛期的主要气候因子;(4)楝树物候变化是植物对气候变暖的响应。  相似文献   

市级区域自动站信息处理系统的开发和应用   总被引：1，自引：1，他引：0  

蒋礼珍  符永兴  徐一晖 《气象研究与应用》2010,31(1):77-79

介绍了钦州市区域自动站信息处理系统的体系结构、主要功能、特点以及实施意义。通过建立区域自动站信息资料处理系统,对各市局乃至各区域站的历史资料进行剥离,实现各区域站历史资料的独立存档、统计,便于对区域气象站历史资料进行开发和应用。  相似文献   

Multi-scale climate variability of the South China Sea monsoon: A review   总被引：10，自引：0，他引：10  

Bin Wang  Fei Huang  Zhiwei Wu  Jing Yang  Xiouhua Fu  Kazuyoshi Kikuchi 《Dynamics of Atmospheres and Oceans》2009,47(1-3):15-37

This review recapitulates climate variations of the South China Sea (SCS) monsoon and our current understanding of the important physical processes responsible for the SCS summer monsoon's intraseasonal to interannual variations. We demonstrate that the 850 hPa meridional shear vorticity index (SCSMI) can conveniently measure and monitor SCS monsoon variations on a timescale ranging from intraseasonal to interdecadal. Analyses with this multi-scale index reveal that the two principal modes of intraseasonal variation, the quasi-biweekly and 30–60-day modes, have different source regions and lifecycles, and both may be potentially predicted at a lead time longer than one-half of their corresponding lifecycles. The leading mode of interannual variation is seasonally dependent: the seasonal precipitation anomaly suddenly reverses the sign from summer to fall, and the reversed anomaly then persists through the next summer. Since the late 1970s, the relationship between the SCS summer monsoon and El Niño-Southern Oscillation (ENSO) has significantly strengthened. Before the late 1970s, the SCS summer monsoon was primarily influenced by ENSO development, while after the late 1970s, it has been affected mainly in the decaying phase of ENSO. The year of 1993 marked a sudden interdecadal change in precipitation and circulation in the SCS and its surrounding region. Over the past 60 years, the SCS summer monsoon's strength shows no significant trend, but the SCS winter monsoon displays a significant strengthening tendency (mainly in its easterly component and its total wind speed). A number of outstanding issues are raised for future studies.  相似文献