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Seasonal variation of global stratosphere-troposphere mass exchange

Progress in Natural science:Materials International 2007年第12期17卷 1466-1475页

作者： Guo Dong1,2. Lu Daren2.and Sun Zhaobo1(1. Institute of Atmospheric sciences, Nanjing University of Information science and Technology, Nanjing 2.0044, {2. 2. LAGEO, Institute of Atmospheric physics, chinese Academy of sciences, beijing 10002., {2.) Institute of Atmospheric sciences Nanjing University of Information Science and Technology Nanjing 210044 China LAGEO Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

By Wei formula in pressure coordinate, the stratosphere-troposphere mass exchange (STME) is diagnosed globally for 44 years from 1958 to 2.01 using the European center for Medium-Range Weather Forecasts (ECMWF) reanalysis datasets. Regions of mass flux into the stratosphere are found over Indonesia, bay of Bangladesh and the mid-west coast of South Africa. Compensating mass outflow from the stratosphere appears mainly over mid-latitudes near large-scale troughs. Upward and downward transport of mass at the middle and high latitudes accompany with each other. Mass flux into troposphere is stronger in autumn and winter than in spring and summer. Strong downward mass flux into the troposphere occurs in eastern Asia the whole year with nearly stable sites. Although the area of eastern Asia accounts for only 5.6% of that of the northern hemisphere (NH), its net mass exchange reaches 15.83. of that of the NH, which means that research on STME of eastern Asia is greatly important to that of the NH and even the global areas. Air across the tropopause enters more from stratosphere to troposphere than that from troposphere to stratosphere, which is possibly related with systematic bias of the assimilated datasets and with persistent rise of the tropopause height. Contributions of the mass exchange and the mass flux exchange in the NH and southern hemisphere (SH) on their latitudes increase from equator to pole, with larger contributions in the NH. Mass exchange and mass flux exchange per areas at high latitudes are larger than that at low latitudes, which means greater mass exchange efficiency at high latitudes.

关键词： stratosphere troposphere mass exchange seasonal variation.

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Isomerization of B_6,B_6^- and B_6^+ clusters

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science china Chemistry 2010年第1期53卷 202-209页

作者： WEI GongMin1,PU ZhiFeng2.ZOU Rong3.LI GuoLiang2.3.& LUO Qiong2.3.1Department of {3.,Capital Normal University,beijing 100048,{2. 2.tate Key Laboratory of Explosion science and Technology beijing Institute of Technology,beijing 100081,{2. 3.11} for Computational Quantum Chemistry,South {2. Normal University,Guangzhou 51063.,{2. Department of physics Capital Normal University Beijing China State Key Laboratory of Explosion science and Technology Beijing Institute of Technology Beijing China center for Computational Quantum Chemistry South China Normal University Guangzhou China

The interconversions between isomers with the same spin multiplicity of neutral B6 and charged B6-and B6+ clusters have been investigated at the B3.YP/6-3.1+G level of theory,including determination of the minimum energy pathways with transition states connecting the corresponding reactants and *** dynamic calculations,2. isomers were optimized,including 11 novel *** order to further refine the energies,single-point B3.YP/6-3.1+G(3.f) calculations were carried out on the corresponding B3.YP/6-3.1+G geometries of all isomers of B6,B6-and B6+ and the corresponding isomerization transition *** stability of each isomer of B6(singlet and triplet states),B6-(doublet state) and B6+(doublet state) was analyzed from both thermodynamic and dynamic viewpoints.

关键词： B6 transition state intrinsic reaction coordinate barrier height

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Complete multiple round quantum dense coding with quantum logical network

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chinese science Bulletin 2007年第9期52卷 1162-1165页

作者： LI ChunYan1,2.LI XiHan1,2.DENG FuGuo1,2.3.ZHOU Ping1,2.& ZHOU HongYu1,2.3.1 Key Laboratory of Beam Technology and Material Modification of Ministry of Education,beijing Normal University,beijing 100875,{2. 2.Institute of Low Energy Nuclear physics,and Department of Material science and Engineering,beijing Normal University,beijing 100875,{2. 3.beijing Radiation center,beijing 100875,{2. Key Laboratory of Beam Technology and Material Modification of Ministry of Education Beijing Normal University Beijing China Institute of Low Energy Nuclear physics and Department of Material Science and Engineering Beijing Normal University Beijing China beijing Radiation center Beijing China

We present a complete multiple round quantum dense coding scheme for improving the source ca-pacity of that introduced recently by Zhang et al. The receiver resorts to two qubits for storing the four local unitary ope... 详细信息

关键词：量子通信多重量子紧凑编码量子逻辑网络量子纠缠

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GRB 09042.:Marking the death of a massive star at z=8.2

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science china({2.,Mechanics & Astronomy) 2010年第S1期53卷 64-68页

作者： LIN Lin1,LIANG EnWei2.& ZHANG ShuangNan3.1 Department of physics and center for Astrophysics,Tsinghua University,beijing 100084,china 2.Department of physics,Guangxi University,Nanning 53.004,china 3.Key Laboratory of Particle Astrophysics,Institute of High Energy physics,chinese Academy of sciences,{13.,china Department of physics and center for Astrophysics Tsinghua University Beijing China Department of physics Guangxi University Nanning China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing China

GRB 09042. is the new high-z record holder of Gamma-ray bursts(GRBs) with *** present a detailed analysis of both the spectral and temporal features of GRB 09042. observed with Swift/BAT and Fermi/*** find that the T90 observed with BAT in the 15-150 keV band is 13.2.s,corresponding to-1.4 s at z=*** once again gives rise to the issue of whether the progenitors of high-z GRBs are massive stars or mergers since the discovery of GRB 080913.at z=*** comparison with the T90 distribution in the burst frame of the current redshift-known GRB sample,we find that it is marginally grouped into the long group(Type II GRBs).The spectrum observed with both BAT and GBM is well fitted by a power-law with exponential cutoff,which yields an Ep=(50.4±7.0) *** event satisfies the Amati-relation well for Type II GRBs within their 3. uncertainty *** results indicate that this event would be produced by the death of a massive *** on the Amati-relation,we derive its distance modulus,which follows the Hubble diagram of the concordance cosmology model at a redshift of-8.2.

关键词： gamma-ray bursts high energy phenomenon cosmology

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theoretical research progress in new-generation Internet architecture

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science in china(Series F) 2008年第11期51卷 1634-1660页

作者： WU JianPing1,2.3.LIU Ying2.3.& WU Qian2.3.1 Department of Computer {3.,Tsinghua University,beijing 100084,{2. 2.Network Research center,Tsinghua University,beijing 100084,{2. 3.Tsinghua National Laboratory for Information {3. and Technology(TNList) ,beijing 100084,{2. Department of Computer science Tsinghua University Beijing China Network Research center Tsinghua University Beijing China Tsinghua National Laboratory for Information science and Technology (TNList) Beijing China

Internet has become the most important information infrastructure supporting modern socio-economic development, social progress and technological Innovation. Invented 3. years ago, today Internet is facing increasingly severe technical challenges. This paper introduces the progress of the major international newgeneration Internet research plans; analyzes its basic characteristics and the principal contradictions during the development; detsiledly introduces the research carried out by 973.Project ＂Research of Future Internet Architecture＂ on the key scientific issues of new-generation Internet architecture and its latest research results; and looks to the future of the research-focus faced with the new situations of the basic research of new-generation Internet architecture as well as the new demands of innovative applications on Internet architecture.

关键词： new-generation Internet network architecture multi-dimension scalability

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Diagnostics for the structure of AGNs'broad line regions with reverberation mapping data:confirmation of the two-component broad line region model

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science china({2.,Mechanics & Astronomy) 2010年第S1期53卷 196-201页

作者： ZHU Ling1 & ZHANG ShuangNan2.1 Department of physics and Tsinghua center for Astrophysics,Tsinghua University,beijing 100084,china 2.Key Laboratory of Particle Astrophysics,Institute of High Energy physics,chinese Academy of sciences,beijing 100049,china Department of physics and Tsinghua center for Astrophysics Tsinghua University Beijing China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing China

We re-examine the ten Reverberation Mapping(RM) sources with public data based on the two-component model of the Broad Line Region(BLR).In fitting their broad Hβ Mlines,six of them only need one Gaussian component,one of them has a double-peak profile,one has an irregular profile,and only two of them need two components,i.e.,a Very Broad Gaussian Component(VBGC) and an Inter-Mediate Gaussian Component(IMGC).The Gaussian components are assumed to come from two distinct regions in the two-component model;they are the Very Broad Line Region(VBLR) and the Inter-Mediate Line region(IMLR).The two sources with a two-component profile are Mrk 509 and NGC *** time lags of the two components of both sources satisfy tIMLR/tVBLR=V 2.BLR/V 2.MLR,where tIMLR and tVBLR are the lags of the two components while VIMLR and VVBLR represent the mean gas velocities of the two regions,supporting the two-component model of the BLR of Active Galactic Nuclei(AGNs).The fact that most of these ten sources only have the VBGC confirms the assumption that RM mainly measures the radius of the VBLR;consequently,the radius obtained from the R-L relationship mainly represents the radius of ***,NGC 4051,with a lag of about 5 days in the one component model,is an outlier on the R-L relationship as shown in Kaspi et al.(2.05);however this problem disappears in our two-component model with lags of about 2.and 6 days for the VBGC and IMGC,respectively.

关键词： broad line region AGN Reverberation Mapping cross correlation

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An Extended Subequation Rational Expansion Method and Solutions of (2.1)-Dimensional Cubic Nonlinear Schr(?)dinger Equation

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Communications in theoretical physics 2007年第12期48卷 987-992页

作者： GUO Wei-Ming~1 LI Biao~(1,3.and CHEN Yong~(1,2.3.~1 Nonlinear science center and Department of Mathematics,Ningbo University,Ningbo 3.52.1,{2.~2.Institute of theoretical Computing,East {2. Normal University,Shanghai 2.0062.{2.~3.Key Laboratory of Mathematics Mechanization,the chinese Academy of sciences,{13. 100080,{2. Nonlinear science center and Department of Mathematics Ningbo University Ningbo 315211 China Key Laboratory of Mathematics Mechanization the Chinese Academy of Sciences Beijing 100080 China Institute of theoretical Computing East China Normal University Shanghai 200062 China

An extended subequation rational expansion method is presented and used to construct some exact,analyt-ical solutions of the (2.1)-dimensional cubic nonlinear Schrdinger *** our results,many known solutionsof the (2.1)-dimensional cubic nonlinear Schrdinger equation can be recovered by means of some suitable selections ofthe arbitrary functions and arbitrary *** computer simulation,the properties of new non-travelling waveand coefficient function's soliton-like solutions,and elliptic solutions are demonstrated by some plots.

关键词： (2.1)-d cubic nonlinear Schrdinger equation soliton solution elliptic function soltuions

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Bifurcation timescales in power spectra of black hole binaries and ultraluminous X-ray sources

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science china({2.,Mechanics & Astronomy) 2010年第S1期53卷 177-182页

作者： WANG TaiShan1 & LI TiPei1,2.1 Department of physics & center for Astrophysics,Tsinghua University,beijing 100084,china 2.Key Laboratory of Particle Astrophysics,Institute of High Energy physics,chinese Academy of sciences,beijing 100049,china Department of physics & center for Astrophysics Tsinghua University Beijing China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing China

For black hole binaries(BHBs) and active galactic nuclei(AGNs),bifurcation timescales(BTs) Δtb exist,below which time-domain power is significantly higher than the corresponding Fourier ***-periodic oscillations(QPOs) are removed from the Fourier spectra of BHBs.A relationship between BT,black hole mass and bolometric luminosity is *** anti-correlation between BT and luminosity of Cyg X-1 is *** removing the QPOs,BTs are also obtained for two ultraluminous X-ray sources(ULXs),M82.X-1 and NGC5408 *** results support that they harbor intermediate mass black holes(IMBHs).

关键词： black hole binary ultraluminous X-ray source power spectral density data analysis

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Vortex genesis over the Bay of Bengal in spring and its role in the onset of the Asian Summer Monsoon

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science china Earth sciences 2011年第1期54卷 1-9页

作者： WU GuoXiong1, GUAN Yue1,2. WANG TongMei3. LIU YiMin1, YAN JingHui4 & MAO JiangYu1 1 State Key Laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric physics, {2. Academy of sciences, beijing 10002., china 2.raduate University of {2. Academy of sciences, beijing 100049, china 3.epartment of Atmospheric science, Sun Yat-Sen University, Guangzhou 5102.5, china 4National Climate {12., china Meteorological Administration, beijing 100080, china State Key Laboratory of Numerical Modeling for Atmospheric sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Graduate University of chinese Academy of sciences Beijing China Department of Atmospheric science Sun Yat-Sen University Guangzhou China National Climate center China Meteorological Administration Beijing China

Physical processes associated with onset of the 1998 Asian summer monsoon were examined in detail using multi-source datasets. We demonstrated that strong ocean-atmosphere-land interaction in the northern Indian Ocean and tropical Asian area during spring is a fundamental factor that induces the genesis and development of a monsoon onset vortex over the Bay of Bengal (BOB), with the vortex in turn triggering onset of the Asian summer monsoon. In spring, strong surface sensible heating over India and the Indochina Peninsula is transferred to the atmosphere, forming prominent in situ cyclonic circulation, with anticyclonic circulations over the Arabian Sea and northern BOB where the ocean receives abundant solar radiation. The corresponding surface winds along the North Indian Ocean coastal areas cause the ocean to produce the in situ offshore currents and upwelling, resulting in sea surface temperature (SST) cooling. With precipitation on the Indochina Peninsula increasing from late April to early May, the offshore current disappears in the eastern BOB or develops into an onshore current, leading to SST increasing. A southwest-northeast oriented spring BOB warm pool with SST >3.°C forms in a band from the southeastern Arabian Sea to the eastern BOB. In early May, the Somali cross-equatorial flow forms due to the meridional SST gradient between the two hemispheres, and surface sensible heat over the African land surface. The Somali flow overlaps in phase with the anticyclone over the northern Arabian Sea in the course of its inertial fluctuation along the equator. The convergent cold northerlies on the eastern side of the anticyclone cause the westerly in the inertial trough to increase rapidly, so that enhanced sensible heat is released from the sea surface into the atmosphere. The cyclonic vorticity forced by such sensible heating is superimposed on the inertial trough, leading to its further increase in vorticity strength. Since atmospheric inertial motion is destr

关键词： air-sea interaction spring BOB warm pool monsoon onset vortex inertial oscillation Asian summer monsoon onset

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Modeling the climate effects of different subregional uplifts within the Himalaya-Tibetan Plateau on Asian summer monsoon evolution

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chinese science Bulletin 2012年第35期57卷 4617-4626页

作者： ZHANG Ran 1,JIANG DaBang 1,2.3.LIU XiaoDong 4 & TIAN ZhiPing 2.5 1 Climate Change Research center,{3. Academy of {2.s,beijing 10002.,china 2.Nansen-Zhu International Research Centre,Institute of Atmospheric physics,{3. Academy of {2.s,beijing 10002.,china 3.Key Laboratory of Regional Climate-Environment Research for Temperate East Asia,{3. Academy of {2.s,beijing 10002.,china 4 State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,{3. Academy of {2.s,Xi’an 710075,china 5 Graduate University of {3. Academy of {2.s,beijing 100049,china Climate Change Research center Chinese Academy of Sciences Beijing China Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Key Laboratory of Regional Climate-Environment Research for Temperate East Asia Chinese Academy of Sciences Beijing China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi’an China Graduate University of chinese Academy of sciences Beijing China

Considering the different uplifting time of different subregions of the Himalaya-Tibetan Plateau(TP),a series of numerical simulations have been conducted with the Community Atmosphere Model(CAM4) developed at the National center for Atmospheric Research to explore the effects of the phased tectonic uplift of the Himalaya-TP on the evolution of Asian summer *** results show that the uplifts of the Himalaya and northern TP significantly affect the evolutions of South Asian summer monsoon and northern East Asian summer monsoon *** is,the tectonic uplift of the Himalaya intensifies the South Asian summer monsoon circulation and increases the precipitation in South Asia,whereas the uplift of the northern TP intensifies the northern East Asian summer monsoon circulation and increases the precipitation in northern East *** with previous simulations,current comparative analyses of modeling results for different subregional uplifts within the Himalaya-TP help deepen our understanding of the evolutionary history of Asian monsoons.

关键词：青藏高原隆升喜马拉雅亚洲季风高原气候夏季季风次区域隆起演化建模

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