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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 {2. of {2. modeling for atmospheric sciences and geophysical fluid dynamics, institute of atmospheric physics, chinese academy of sciences, {12., China Department of Computational Mathematics, academy of Mathematics and System sciences, Peking University, beijing 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. Some{2. tests on the new dynamical core, respectively regardingits global conservations and its integrated performances inclimatic modeling, 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 {2. of {2. modeling for atmospheric sciences 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

The onset and advance of the Asian summer monsoon

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Science Bulletin 2006年第1期51卷 80-88页

作者： Lü Junmei1,2.4, ZHANG Qingyun1, TAO Shiyan1 & JU Jianhua3 1. State key {2. of {2. modeling for atmospheric Sci- ences and geophysical fluid dynamics, institute of atmospheric physics, chinese academy of sciences, beijing 10002., China 2. Department of atmospheric sciences, Yunnan University, Kunming 650091, China 3. China Meteorological Administration Training Centre, beijing 100081, China 4. Graduate School of chinese academy of sciences, beijing 100039, China State key {2. of {2. modeling for atmospheric sciences and geophysical fluid dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Department of atmospheric sciences Yunnan University Kunming 650091 China Graduate School of chinese academy of sciences Beijing 100039 China China Meteorological Administration Training Centre Beijing 100081 China

Based on the daily outgoing longwave radiation (OLR) data from National Oceanic and At- mospheric Administration (NOAA) satellites, the Cli- mate Prediction Center’s merged analysis of pre- cipitation (CMAP) data and the National Centers for Environmental Prediction/National Center for At- mospheric Research (NCEP/NCAR) reanalysis dataset, the mean intraseasonal variability of the Asian summer monsoon (ASM) is investigated by using power spectrum analysis, band-pass filter, and diagnostic analyses. The processes of the onset and advance of monsoon over the southern part of Indo- china Peninsula, the east coast of Bay of Bengal, the South China Sea and the Indian subcontinent are explored. It is found that there is an abrupt change in OLR, precipitation and zonal wind during the onset and advance of the ASM. It is also indicated that the southern part of Indochina Peninsula and the adja- cent Andaman Sea is the region where the earliest onset of the ASM occurs in the 2.d pentad of May.

关键词： Asian summer monsoon intraseasonal variability onset advance.

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 {2. of {2. modeling for atmospheric sciences 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 （2.°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

Correlation of Dust Storms in China with Chlorophyll a Concentration in the Yellow Sea between 1997-2.07

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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 {2. of {2. modeling for atmospheric sciences and geophysical fluid dynamics,institute of atmospheric physics,chinese academy of sciences,{12.,China 2.key {2. of Meteorological Disaster of Ministry of Education,Nanjing University of Information Science and Technology,Nanjing 2.0044,China [a] State key {2. of {2. modeling for atmospheric sciences 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 2.2.meteorological stations in China,the characteristics of dust storms between 1997 and 2.07 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

Comparison of the global air-sea freshwater exchange evaluated from independent datasets

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Progress in Natural Science:Materials International 2003年第8期 68-73页

作者： ZHOU Tianjun(State key {2. of {2. modeling for atmospheric sciences and geophysical fluid dynamics (LASG), institute of atmospheric physics, chinese academy of sciences, {12., China) State key {2. of {2. modeling for atmospheric sciences and geophysical fluid dynamics LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The implied air-sea freshwater flux is examined in two reanalysis datasets provided respectively by European Center forMedium-range Weather Forecasts and National Center for Environmental Prediction. Not only for annual mean state but also for seasonalvariation, two reanalyses agree qualitatively well with each other, and both can reproduce reasonably the global distribution of E-P (i. *** minus Precipitation). In the view of quantitative comparison, however, remarkable difference has been found on regionalscales, especially over the middle and lower latitudes, with some local disagreement exceeding 100 cm/yr. One important difference be-tween current and previous evaluation is the new found net evaporation over the high latitude North Atlantic, which is demonstrated to re-sult from the transient disturbances during boreal winter.

关键词： air-sea freshwater exchange reanalysis datasets.

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 {2. of {2. modeling for atmospheric Science and geophysical 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 30 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 {2. of {2. modeling for atmospheric sciences and geophysical fluid dynamics (LASG), institute of atmospheric physics, chinese academy of sciences, {12., China 2.raduate University of chinese academy of sciences, beijing 100049, China 3Department of atmospheric Science, Sun Yat-Sen University, Guangzhou 5102.5, China 4National Climate Center, China Meteorological Administration, beijing 100080, China 1. State key {2. of {2. modeling for atmospheric sciences 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 >31°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

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 {2. of {2. modeling for atmospheric sciences and geophysical fluid dynamics, institute of atmospheric physics, chinese academy of sciences, {12., 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 2.0030, China 6 Department of atmospheric sciences, Lanzhou University, Lanzhou 730000, China 7 China Meteorological Administration Training Center, beijing 100089, China 1. State key {2. of {2. modeling for atmospheric sciences 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