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chinese science Bulletin 2003年第S2期48卷 18-23页

作者： MAO Jiangyu, DUAN Anmin, LIU Yimin WU Guoxiong state key Laboratory of numerical modeling for Almospheric {3. and {4. fluid dynamics (LAsG), institute of atmospheric physics, chinese academy of sciences, beijing 100029, china chinese Acad sci Inst Atmospher Phys Lab Numer Modeling Atmospher Sci & Geophys Fluid LASGState Key Lab Numer Modeling Atmospher Sci & Beijing 100029 Peoples R China

The NCEP/NCAR reanalysis data are used tostudy the relationships among the change in the tilting of theridgeline surface of the subtropical anticyclone, the estab-lishment of the so-called "seasonal transition axis (sTA)" andthe onset of the Asian summer monsoon. It is shown that themonsoon onset is characterized by the overturning of themeridional temperature gradient (MTG) in the vicinity of theridgeline surface. A MTG index is then constructed to inves-tigate the predictability of the Asian summer monsoon onsetconceptually. Data diagnoses show that if the initial MTG isknown and the meridional gradient across the ridgeline sur-face of the local temperature tendency can be estimated, alate or early onset of the summer monsoon can be qualita-tively predicted in advance.

关键词： ridgeline surface meridional temperature gradient summer monsoon onset predictability.

A semi-implicit semi-Lagrangian global nonhydrostatic model and the polar discretization scheme

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science china Earth sciences 2007年第12期50卷 1885-1891页

作者： YANG Xuesheng1,CHEN JiaBin2,HU JiangLin1,CHEN DeHui1,sHEN Xueshun1,ZHANG HongLiang1 1 state key Laboratory of severe Weather,chinese academy of Meteorological {3.,{4. 100081,china 2 state key Laboratory of numerical modeling for atmospheric {3. and geophysical fluid {13.,{14.,beijing 100029,china 1. state key Laboratory of severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China 2. state key Laboratory of numerical modeling for {3. {4. and geophysical fluid dynamics Institute of Atmospheric Physics Beijing 100029 China

The Global/Regional Assimilation and PrEdiction system(GRAPEs) is a newly developed global non-hydrostatic numerical prediction model,which will become the next generation medium-range opera-tional model at china Meteorological Administration(CMA).The dynamic framework of GRAPEs is featuring with fully compressible equations,nonhydrostatic or hydrostatic optionally,two-level time semi-Lagrangian and semi-implicit time integration,Charney-Phillips vertical staggering,and complex three-dimensional pre-conditioned Helmholtz solver,*** the singularity of horizontal momentum equations at the poles,the polar discretization schemes are described,which include adoption of Arakawa C horizontal grid with ν at poles,incorporation of polar filtering to maintain the computational stability,the correction to Helmholtz equation near the poles,as well as the treatment of semi-Lagrangian interpolation to improve the departure point accuracy,*** balanced flow tests validate the rationality of the treatment of semi-Lagrangian departure point calculation and the polar discretization during long time *** and suarez tests show that the conservation proper-ties of GRAPEs model are quite good.

关键词： nonhydrostatic, global model, semi-implicit, semi-Lagrangian, polar discretization, conservation

Design of a new dynamical core for global atmospheric models based on some efficient numerical methods

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science china Mathematics 2004年第z1期47卷 4-21页

作者： WANG Bin, WAN Hui, Jl Zhongzhen, ZHANG Xin, YU Rucong, YU Yongqiang & LIU Hongtaostate key Laboratory of numerical modeling for {3. {4. and geophysical fluid dynamics, institute of atmospheric physics, chinese academy of sciences, beijing 100029, china Department of Computational Mathematics, academy of Mathematics and system {4., Peking University, {14. 100871, china chinese Acad sci Inst Atmospher Phys State Key Lab Numer Modeling Atmospher Sci & Geop Beijing 100029 Peoples R China Peking Univ Acad Math & Syst Sci Dept Computat Math Beijing 100871 Peoples R China

A careful study on the integral properties of the primitive hydrostatic balance equations for baroclinic atmosphere is carried out, and a new scheme todesign the global adiabatic model of atmospheric dynamics ispresented. This scheme includes a method of weighted equal-areamesh and a fully discrete finite difference method with quadraticand linear conservations for solving the primitive equationsystem. Using this scheme, we established a new dynamical corewith adjustable high resolution acceptable to the availablecomputer capability, which can be very stable without anyfiltering and smoothing. Especially, some important integralproperties are kept unchanged, such as the anti-symmetries of thehorizontal advection operators and the vertical convectionoperator, the mass conservation, the effective energy conservationunder the standard stratification approximation, and so on. somenumerical tests on the new dynamical core, respectively regardingits global conservations and its integrated performances inclimatic {3., incorporated with the physical packagesfrom the Community atmospheric Model Version 2 (CAM2) of NationalCenter for atmospheric Research (NCAR), are included.

关键词： dynamical core, equal-area mesh, anti-symmetry, effective energy conservation.

A Comparison study of the Contributions of Additional Observations in the sensitive Regions Identified by CNOP and FsV to Reducing Forecast Error Variance for the Typhoon Morakot

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atmospheric and Oceanic science Letters 2010年第5期3卷 258-262页

作者： QIN Xiao-Hao state key Laboratory of numerical modeling for {3. {4. and geophysical fluid dynamics （LAsG） Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of chinese academy of sciences Beijing 100049 China

The sensitive regions of conditional nonlinear optimal perturbations (CNOPs) and the first singular vector (FsV) for a northwest Pacific typhoon case are reported in this paper. A large number of probes have been designed in the above regions and the ensemble transform Kalman filter (ETKF) techniques are utilized to examine which approach can locate more appropriate regions for typhoon adaptive observations. The results show that, in general, the majority of the probes in the sensitive regions of CNOPs can reduce more forecast error variance than the probes in the sensitive regions of FsV. This implies that adaptive observations in the sensitive regions of CNOPs are more effective than in the sensitive regions of FsV. Furthermore, the reduction of the forecast error variance obtained by the best probe identified by CNOPs is twice the reduction of the forecast error variance obtained by FsV. This implies that dropping sondes, which is the best probe identified by CNOPs, can improve the forecast more than the best probe identified by FsV. These results indicate that the sensitive regions identified by CNOPs are more appropriate for adaptive observations than those identified by FsV.

关键词： adaptive observations, CNOP, FsV, sensitive regions signal variance

A numerical CALCULATION METHOD FOR EIGENVALUE PROBLEMs OF NONLINEAR INTERNAL WAVEs

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Journal of Hydrodynamics 2009年第3期21卷 373-378页

作者： sHI Xin-gang FAN Zhi-song LIU Hai-long College of Physical and Environmental Oceanography Ocean University of China Qingdao 266100 China state key Laboratory of numerical modeling for {3. {4. and geophysical fluid dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Generally speaking, the background shear current U（z） must be taken into account in eigenvalue problems of nonlinear internal waves in ocean, as is different from those of linear internal waves. A numerical calculation method for eigenvalue problems of nonlinear internal waves is presented in this paper on the basis of the Thompson-Haskell＇s calculation method. As an application of this method, at a station （21°N, 117°15′E） in the south china sea, a modal structure and parameters of nonlinear internal waves are calculated, and the results closely agree with the calculated results based on observation by Yang et al..

关键词： internal waves eigenvalue problem modal structure numerical method

Dominant climate factors influencing the Arctic runoff and association between the Arctic runoff and sea ice

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Acta Oceanologica sinica 2010年第5期29卷 10-20页

作者： LI Pixue ZHANG Zhanhai LIU Jiping Ocean University of china Qingdao 266100 China Polar Research institute of china Shanghai 200136 China state key Laboratory of numerical modeling for {3. science and {4. fluid dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China shanghai Marine Environmental Monitoring and Forecasting Center Shanghai 200232 China

By using the Arctic runoff data from R-ArcticNET V4.0 and ArcticRIMs,trends of four major rivers flowing into the Arctic Ocean,whose climate factor plays an important role in determining the variability of the Arctic runoff,are *** results show that for the past 3. years,the trend of the Arctic runoff is seasonally *** is a significant trend in spring and winter and a significant decreasing trend in summer,leading to the reduced seasonal *** spring,surface air temperature is the dominant factor influencing the four *** summer,precipitation is the most important factor for Lena and Mackenzie,while snow cover is the most important factor for Yenisei and *** Mackenzie,atmospheric circulation does play an important role for all the seasons,which is not the case for the Eurasian *** authors further discuss the relationships between the Arctic runoff and sea *** negative correlation is found at the mouth of the rivers into the Arctic Ocean in spring,while significant positive correlation is observed just at the north of the mouths of the rivers into the Arctic in *** addition,each river has different relationship with sea ice in the eastern Greenland sea.

关键词： Arctic runoff multiple linear regressions sea ice

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 {3. sciences and geophysical fluid dynamics (LAsG), institute of atmospheric physics, chinese academy of sciences, beijing 100029, china 2Graduate University of chinese academy of sciences, {13. 10004., china 3.epartment of {3. science, sun Yat-sen University, Guangzhou 510275, china 4.ational Climate Center, china Meteorological Administration, {13. 100080, china 1. state key Laboratory of numerical modeling for {3. {4. and geophysical fluid dynamics (LAsG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. Department of Atmospheric Science Sun Yat-Sen University Guangzhou 510275 China4. National Climate Center China Meteorological Administration Beijing 100080 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

Origins of intraseasonal rainfall variations over the southern south china sea in boreal winter

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atmospheric and Oceanic science Letters 2017年第1期10卷 44-50页

作者： CAO Xi WU Ren-Guang Center for Monsoon system Research chinese academy of sciences state key Laboratory of numerical {3. for {4. sciences and geophysical fluid dynamics Center for Monsoon system Research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China state key Laboratory of numerical modeling for {3. {4. and geophysical fluid dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

This study investigates the origins of intraseasonal rainfall variations over the southern south china sea（sCs） region in boreal *** is found that intraseasonal rainfall variations over the southern sCs have different origins on the 10-20-day and 3.-60-day time *** the 10-20-day time scale,large rainfall anomalies over the southern sCs are preceded by strong northerly wind anomalies associated with the East Asian winter monsoon（EAWM）,by about two *** the 3.-60-day time scale,the strong EAWM-related northerly wind anomalies almost appear simultaneously with large rainfall anomalies over the southern *** addition,obvious large rainfall anomalies occur over the southeastern tropical Indian Ocean about one week before the peak southern sCs rainfall *** indicates that the convection and related circulation anomalies with origins over the tropical Indian Ocean may play an important role in inducing intraseasonal rainfall variations over the southern sCs on the 3.-60-day time scale,but not on the 10-20-day time scale.

关键词： Intraseasonal rainfall anomalies southern south china sea boreal winter 10-20-day and 3.-60-day time scales

Three-dimensional decomposition method of global atmospheric circulation

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science china Earth sciences 2008年第3期51卷 386-402页

作者： LIU HaiTao1,2,3. HU shuJuan4. XU Ming5 & CHOU JiFan6,7 1 state key Laboratory of numerical modeling for {3. sciences and geophysical fluid dynamics, institute of atmospheric physics, chinese academy of sciences, beijing 100029, china 2 Graduate University of chinese academy of sciences, {13. 10004., china 3.{13. Climate Center, {13. 100089, china 4.Department of Mathematics, Lanzhou University, Lanzhou 73.000, china 5 shanghai Typhoon institute, shanghai 20003., china 6 Department of {3. sciences, Lanzhou University, Lanzhou 73.000, china 7 china Meteorological Administration Training Center, {13. 100089, china 1. state key Laboratory of numerical modeling for {3. {4. and geophysical fluid dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. Graduate University of chinese academy of sciences Beijing 100049 China 3. beijing Climate Center Beijing 100089 China 4. Department of Mathematics Lanzhou University Lanzhou 730000 China 5. shanghai Typhoon institute Shanghai 200030 China 6. Department of atmospheric sciences Lanzhou University Lanzhou 730000 China 7. china Meteorological Administration Training Center Beijing 100089 China

By adopting the idea of three-dimensional Walker, Hadley and Rossby stream functions, the global atmospheric circulation can be considered as the sum of three stream functions from a global perspective. Therefore, a m... 详细信息

关键词： three-dimensional decomposition of the global atmospheric circulation generalized Walker Hadley and Rossby stream functions existence and uniqueness vertical motion

Correlation of Dust storms in china with Chlorophyll a Concentration in the Yellow sea between 1997-2007

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atmospheric and Oceanic science Letters 2012年第2期5卷 140-144页

作者： TAN sai-Chun 1,2 and sHI Guang-Yu 1 1 state key Laboratory of numerical modeling for {3. {4. and geophysical fluid dynamics,institute of atmospheric physics,chinese academy of sciences,beijing 100029,china 2 key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing University of Information science and Technology,Nanjing 21004.,china [a] state key Laboratory of numerical modeling for {3. {4. and geophysical fluid dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China[b] Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology Nanjing 210044 China

Based on daily observation data at 222 meteorological stations in china,the characteristics of dust storms between 1997 and 2007 were ***,the relationship between dust events and chlorophyll (Chl) a concentration in the Yellow sea was *** were six regions with high annual frequencies of dust *** seasonal distribution of dust storms showed spatiotemporal *** six regions with highest annual frequencies also exhibited high frequencies of dust storms in *** storms in most regions occurred in *** all dust storms in china,sixty-five percent of all dust storms occurred during the *** area and frequency of dust storms were smaller in fall and winter than in spring and summer.A significant correlation was found between dust events and Chl a concentration in the Yellow *** correlation regions included Qinghai-Xizang region,part of the Hexi Corridor,the western Inner Mongolia and Hetao Regions,and the Hunshandake *** high correlation may be induced by the high ratio of dust storms in the abovementioned regions that arrive over the Yellow sea,as inferred through a forward trajectory analysis;especially notable is dust transported at a lower altitude (3.km).

关键词： dust storm spatial distribution seasonal variation chlorophyll Yellow sea