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Teleconnection between the Indian summer monsoon onset and the Meiyu over the Yangtze River Valley

science china earth sciences 2008年第7期51卷 1021-1035页

作者： LIU YunYun1,2,3 & DING YiHui2 1 Chinese academy of Meteorological sciences, Beijing 100081, china 2 National Climate center, Beijing 100081, china 3 Graduate University of Chinese academy of sciences, Beijing 100049, china Chinese academy of Meteorological sciences Beijing China National Climate center Beijing China Graduate University of Chinese academy of sciences Beijing China

Based on the Indian and Chinese precipitation data and the NCEP-NCAR reanalysis circulation data, the relationship between the Indian summer monsoon (ISM) onset and the Meiyu over the Yangtze River Valley has been discussed by the methods of correlation analysis and composite analysis. The results show that the date of ISM onset over Kerala in the southwestern coast of the Indian Peninsula is about two weeks earlier than the beginning of the Meiyu over the Yangtze River Valley. After the outbreak of ISM, the teleconnection mode sets up from the western coast of India via the Bay of Bengal (BOB) to the Yangtze River Valley and southern Japan. It is different both in time and space from the telecon- nection mode which is from the northwest of India via the Tibetan Plateau to northern china. The for- mer mode is defined as the "south" teleconnection of the Asian summer monsoon, forming in the pe- riod of ISM onset; while the latter mode is called the "north" teleconnection, mainly occurring in the Asian monsoon culminant period. During the process of the "south" teleconnection’s formation, the Asian monsoon circulation has experienced a series of important changes: ISM onset, the northward movement of the south Asia high (SAH), the onset vortex occurrence, the eastward extension of the stronger tropical westerly belt, and the northeastward jump of the western Pacific subtropical high (WPSH), etc. Consequently, since ISM sets up over Kerala, the whole Asian continent is covered by the upper SAH after about two weeks, while in the mid- and lower troposphere, a strong wind belt forms from the Arabian Sea via the southern India, BOB and the South china Sea (SCS), then along the western flank of WPSH, to the Yangtze River Valley and southern Japan. With the northward moving of the subtropical jet streams, the upper westerly jet stream and the low level jet have been coupled ver- tically over east Asia, while the Yangtze River Valley happens to locate in the ascending motion

关键词： Indian summer monsoon (ISM) the Meiyu over the Yangtze River Valley teleconnection mode

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Potential land for plantation of Jatropha curcas as feedstocks for biodiesel in china

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science china earth sciences 2010年第1期53卷 120-127页

作者： WU WeiGuang 1,2,3,HUANG JiKun 1,3 & DENG XiangZheng 1,3 1 Institute of Geographic sciences and Natural Resources research,Chinese academy of sciences,Beijing 100101,china 2 Department of Economics and Management,Zhejiang Forestry University,Linan 311300,china 3 center for Chinese Agricultural Policy,Chinese academy of sciences,Beijing 100101,china Institute of Geographic sciences and Natural Resources research Chinese Academy of Sciences Beijing China Department of Economics and Management Zhejiang Forestry University Linan China center for Chinese Agricultural Policy Chinese Academy of Sciences Beijing China

As a renewable energy,biofuel has attracted great attention in china and the rest of *** with the national food security,china recently has shifted its biofuel development priority from grain-based to non-grain-based biofuels,including forest-based biodiesel,since *** curcas is one of major biodiesel ***,there is rising debate on availability of land for expanding Jatropha curcas *** overall goal of this paper is to evaluate potential land for Jatropha curcas used as feedstock for biodiesel in *** on remote sensing data on land use,data on meteorological,soil and land slope,and suitable environment for Jatropha curcas plantation,this study uses Agro Ecological Zone method and considers social-economic constraints to evaluate potential suitable land for Jatropha curcas plantation in china's major Jatropha curcas production region,Southwest *** results show that while there are some potential lands to expand Jatropha curcas areas,amount of these lands will hardly meet the government's target for Jatropha curcas-based biodiesels development in the *** may need to reconsider its long-term targets on the development of Jatropha curcas-based biodiesels.

关键词： biodiesel Jatropha curcas potential land suitability evaluation Southwest china

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Principle and application of three-band gradient difference vegetation index

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science china earth sciences 2005年第2期48卷 241-249页

作者： TANG Shihao, ZHU Qijiang, WANG Jindi, ZHOU Yuyu & ZHAO Feng research center for Remote Sensing and GIS, Department of Geography, Beijing Normal University, Beijing 100875, china National Satellite Meteorological center, china Meteorological Administration, Beijing 100081, china research center for Remote Sensing and GIS Department of Geography Beijing Normal University Beijing China National Satellite Meteorological center China Meteorological Administration Beijing China

Vegetation index is a simple, effective and experiential measurement of terrestrial vegetation activity, and plays a very important role in qualitative and quantitative remote sensing. Aiming at shortages of current vegetation indices, and starting from the analysis of vegetation spectral characteristics, we put forward a new vegetation index, the three-band gradient difference vegetation index (TGDVI), and established algorithms to inverse crown cover fraction and leaf area index (LAI) from it. Theoretical analysis and model simulation show that TGDVI has high saturation point and the ability to remove the influence of background to some degree, and the explicit functional relation with crown cover fraction and LAI can be established. Moreover, study shows that TGDVI also has the ability to partly remove the influence of thin cloud. Experiment in the Shunyi District, Beijing, china shows that reasonable result can be reached using the vegetation index to retrieve LAI. We also theoretically analyzed the reason why the normalized difference vegetation index (NDVI) owns the low saturation point, and show that it is determined by the definition of NDVI and the characteristic of vegetation spectra, and is unavoidable to some degree. Meanwhile, through model simulation, we also indicate that the relationship between simple ratio vegetation index (SR) and LAI closes to a piecewise linear one instead of a linear one, which is mainly caused by the influence of background and different change rates of reflectance in red and infrared bands with LAI increasing.

关键词： vegetation index, remote sensing, LAI, crown cover fraction, remote sensing inversion.

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基于星敏感器的星光折射卫星自主导航方法研究

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系统工程与电子技术 2004年第3期26卷 353-357页

作者：李琳琳孙辉先中国科学院空间科学与应用研究中心北京100080

研究了基于星光折射量测进行自主确定卫星姿态及轨道的方法。这种导航方案利用高精度的CCD星敏感器,结合星光穿越大气的较精确的数学模型,来间接敏感地平,从而实现对卫星的精确定位和定姿。为了说明所提导航方案的有效性,采用推广卡尔... 详细信息

研究了基于星光折射量测进行自主确定卫星姿态及轨道的方法。这种导航方案利用高精度的CCD星敏感器,结合星光穿越大气的较精确的数学模型,来间接敏感地平,从而实现对卫星的精确定位和定姿。为了说明所提导航方案的有效性,采用推广卡尔曼滤波算法,结合模拟的测量数据对自主定轨进行了仿真。仿真结果表明,定轨精度优于100m。还分析比较了采样周期、星敏感器精度、恒星数目等因素对定轨精度的影响。总结了其变化规律,可用于提高卫星自主定轨精度。

关键词：卫星自主导航星敏感器星光折射角推广卡尔曼滤波

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The Characteristics of the Bottom Boundary(T11) of Late Cretaceous Yaojia Formation in Songliao Basin and Its Dynamic Background

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地学前缘 2009年第S1期16卷 173-174页

作者： Ying Song~1,Jianye Ren~2 1.Faculty of earth Resources,china University of Geosciences,Wuhan 430074,china. 2.Structural research center of Oil & Gas Bearing Basin,Ministry of Education,Branch center in china University of Geosciences,Wuhan 430074,china

Well-preserved Cretaceous lacustrine deposits in Songliao Basin NE china provide a unique opportunity both for building the terrestrial type stage of Cretaceous in china and for studying the response of Cretaceous maj... 详细信息

关键词： Songliao Basin T11 boundary tectonic inversion responding surface tectonic revolution

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Limitations of absolute current densities derived from the Semel & Skumanich method

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science china(Physics,Mechanics & astronomy) 2009年第11期52卷 1678-1685页

作者： LI Jing1 & FAN YuHong2 1 Institute for astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 2 High Altitude Observatory, earth and Sun Systems Laboratory, National center for Atmospheric research, P.O. Box 3000, Boulder, CO 80307, USA Institute for astronomy University of Hawaii Honolulu USA High Altitude Observatory Earth and Sun Systems Laboratory National Center for Atmospheric Research Boulder USA

Semel and Skumanich proposed a method to obtain the absolute electric current density, |Jz|, without disambiguation of 180° in the transverse field directions. The advantage of the method is that the uncertainty in the determination of the ambiguity in the magnetic azimuth is removed. Here, we investigate the limits of the calculation when applied to a numerical MHD model. We have found that the combination of changes in the magnetic azimuth with vanishing horizontal field component leads to errors, where electric current densities are often strong. Where errors occur, the calculation gives |Jz| too small by factors typically 1.2 - 2.0.

关键词： numerical MHD model magnetic field electric current density

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Study on attribute characterization for reservoir dynamic monitoring by seismic

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science china earth sciences 2008年第S2期51卷 218-225页

作者： CHEN XiaoHong1,3,LI JingYe2,3 & ZHAO Wei4 1 Key Lab of Geophysical Exploration of CNPC,china Petroleum University,Beijing 102249,china 2 Basin & Reservoir research center,china Petroleum University,Beijing 102249,china 3 State Key Laboratory of Petroleum Resource and Prospecting,china University of Petroleum,Beijing 102249,china 4 research center of CNOOC,Beijing 100027,china Key Lab of Geophysical Exploration of CNPC China Petroleum University Beijing China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China Basin & Reservoir research center China Petroleum University Beijing China research center of CNOOC Beijing China

Study on characterizing reservoir parameters dynamic variations by time-lapse seismic attributes is the theoretical basis for effectively distinguishing reservoir parameters variations and conducting time-lapse seismic interpretation,and it is also a key step for time-lapse seismic application in real oil fields. Based on the rock physical model of unconsolidated sandstone,the different effects of oil saturation and effective pressure variations on seismic P-wave and S-wave velocities are calculated and analyzed. Using numerical simulation on decoupled wave equations,the responses of seismic amplitude with different offsets to reservoir oil saturation variations are analyzed,pre-stack time-lapse seismic attributes differences for oil saturation and effective pressure variations of P-P wave and P-S converted wave are calculated,and time-lapse seismic AVO (Amplitude Versus Offset) response rules of P-P wave and P-S converted wave to effective pressure and oil saturation variations are compared. The theoretical modeling study shows that it is feasible to distinguish different reservoir parameters dynamic variations by pre-stack time-lapse seismic information,including pre-stack time-lapse seismic attributes and AVO information,which has great potential in improving time-lapse seismic interpreta-tion precision. It also shows that the time-lapse seismic response mechanism study on objective oil fields is especially important in establishing effective time-lapse seismic data process and interpreta-tion scheme.

关键词： time-lapse seismic dynamic monitoring rock physical model pre-stack attribute Amplitude Versus Offset (AVO)

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Thermodynamic properties of LaCrO_3

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Rare Metals 2006年第5期25卷 562-566页

作者： CHEN Zhanheng XING Xianran YUAN Wenxia HUANG Xiaowei LI Hongwei School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Office of the Chinese Society of Rare earths Beijing 100081 China National Engineering research center for Rare earth Materials Beijing 100088 China

The nano powders of LaCrO3 were prepared by a sol-gel route. The heat capacity of LaCrO3 nano powders from 350 to 550 K was measured by DSC method and expressed as： Cpa2CrO3）（±0.112） = 166.844 - 8.500 ×10^-3T- 1.022×10^6T^-2 （J/（mol.K））（350-550 K）. An EMF measurement assembly was developed with CaF2 as an electrolyte for the galvanic cell. From measured EMF data of the reversible cell, （-） PL La2O3, LaF3, O2 （1 atm）lCaF2O2（1 atm）, LaF3, LaCrO3, Cr2O3, Pt（＋）, and the relevant value of Gibbs free energy, the Gibbs free energy of formation of LaCrO3 was calculated from 700 to 885 K： △G ФaLaCrO3 = -1555.364 ＋ 0.354T （kJ/mol）（700-885 K）. And the Gibbs free energy change of reaction from simple oxides La2O3 and Cr2O3 was calculated to be： AG f Oox（LaCrO3） = -94.758 ＋ 8.530×10^-2T（kJ/mol）（700-885 K）.

关键词： lanthanum chromate Gibbs free energy of formation heat capacity EMF measurement nano powder

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Southeastern extension of the Red River fault zone (RRFZ) and its tectonic evolution significance in western South china Sea

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science china earth sciences 2006年第8期49卷 839-850页

作者： LIU Baoming1,2,3, XIA Bin1, LI Xuxuan1,3, ZHANG Minqiang1,3, NIU Binhua2, ZHONG Lifeng1, JIN Qinghuan1,4 & JI Shaocheng1,5 1. Key Laboratory of Marginal Sea Geology and Resources, Chinese academy of sciences,Guangzhou 510640, china 2. china University of Geosciences (Beijing), Beijing 100083, china 3. research center of science & Technology Department, CNOOC, Beijing 100027, china 4. Guangzhou Marine Geological Survey, Ministry of Land & Resources, Guangzhou 510075, china 5. Ecole Polytechnique Montreal, H3C3A7, Canada Key Laboratory of Marginal Sea Geology and Resources Chinese Academy of Sciences Guangzhou China china University of Geosciences (Beijing) Beijing China research center of science & Technology Department CNOOC Beijing China Guangzhou Marine Geological Survey Ministry of Land & Resources Guangzhou China Ecole Polytechnique Montreal Canada

Recent geophysical surveys and basin modeling suggest that the No.1 fault in the Ying- gehai basin (YGHB) is the seaward elongation of the Red River fault zone (RRFZ) in the South china Sea (SCS). The RRFZ, which separates the South china and Indochina block, extends first along the Yuedong fault, offshore of Vietnam, and then continues southward and breaks off into two branches: the Lupar fault and the Tinjia fault. The southern extension of the Lupar fault dies out beneath the NW Borneo while the Tinjia fault extends southeast and reaches the Brunei-Sabah area. According to the gravity and geomagnetic data, and the tectonic evolution of the basins, there are different evolution histories between the Wan’an basin (WAB) and the basins in the Nansha block. The Tinjia fault may be the boundary between the Balingian block and the Nansha block. Hence, the line linking the Yue- dong fault and the Tinjia fault, which both are continental margin faults and strike-slip ones in the geological evolution histories, constitute the boundary between the Indochina and Nansha block. The Lupar fault, in contrast, is an intraplate fault within the Indochina block. The results provide new hints for reconstructing the tectonic evolution history of the RRFZ and the opening of the SCS, and also a framework for hydrocarbon prospecting in the region.

关键词： Red River fault zone, tectonic evolution, fault, extension, western South china Sea.

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Structural characteristics of the Tan-Lu fault zone in Cenozoic basins offshore the Bohai Sea

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science china earth sciences 2008年第S2期51卷 20-31页

作者： QI JiaFu1,2,ZHOU XinHuai3,DENG RongJing4 & ZHANG KeXin2 1 State Key Laboratory of Petroleum Resource and Prospecting,china Petroleum University,Beijing 102249,china 2 Department of earth sciences,china Petroleum University,Beijing 102200,china 3 Tianjin Branch of CNOOC china Limited,Tianjin 300451,china 4 Beijing research center of CNOOC china Limited,Beijing100027,china State Key Laboratory of Petroleum Resource and Prospecting China Petroleum University Beijing China Department of earth sciences China Petroleum University Beijing China Tianjin Branch of CNOOC china Limited Tianjin China Beijing research center of CNOOC china Limited Beijing China

The Tan-Lu fault zone across the eastern margin of the Cenozoic basins offshore the Bohai Sea is a NNE-trending right-lateral strike-slip fault system developed in the Cenozoic basin cover. It cuts through NE-to NNE-striking major extensional faults that controlled the formation of Paleogene basins. Recent petroleum exploration indicates that Cenozoic structural activities of the Tan-Lu fault system have directly or indirectly affected oil and gas distribution offshore the Bohai Sea. As part of a deep fault zone the Tan-Lu fault zone has been activated since the Oligocene,and obviously affected the tectonic evolution of offshore Bohai basins since then. The formation of Paleogene rift basins offshore the Bohai Sea has utilized the pre-existing structural elements of the Tan-Lu fault zone that developed in the late Mesozoic.

关键词： strike-slip fault extensional structure Tan-Lu fault zone Bohaiwan basin

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