| 1 | Dynamical framework with blocking topography coordinates for atmospheric GCM and its validation显示文摘The dynamical framework with Blocking To-pography Coordinates (hereafter, BTC), which is suited tohandle the steep topography for the atmospheric generalcirculation models, is presented in this paper, together withits validation results. The integral properties of both the dif-ferential and finite-difference equations for the BTC dy-namical core are: gross mass conservation, quadratic con-servation for advection terms, Coriolis force does not changethe kinetic energy, conservation of total available energy. Theimproved nonlinear iteration scheme is utilized for thetime-integration. The energy conservation for BTC dynami-cal core is validated by using the integration results from9-layer and 21-layer version respectively. Comparison resultsshow that, the changes of the kinetic energy and total avail-able potential energy during the integration are quite closefor both the BTC dynamical framework and the dynamicalframework of IAP 9-level and IAP 21-level AGCM, and thismay suggest that the BTC dynamical core can be used forlong-term integration with good computational stability.Furthermore, the BTC dynamical core has the advantageover the terrain following (sigma) coordinates in its betterrepresentation of the influence of the large-scale topographyon the atmospheric general circulation. Finally, the correct-ness and reasonableness of the BTC dynamical core has beenfurther proved by the numerical simulation of the topogra-phy influence on the quasi-stationary planetary wave with21-layer version of BTC dynamical framework. | LIN Zhaohui~1, ZHANG Ming~(1,2), LIANG Danqing~(1,2) WANG Aihui~1, ZHANG Dongling~1 & ZENG Qingcun~1 1. ICCES, Institute of Atmospheric Physics, Chinese Academy of Sciences. Beijing 100029. China 2. College of Meteorology. PLA University of Science and Technology, Nanjing 211101. China | 2003 | Chinese Science Bulletin2003，48，S2： | 2 |
| 2 | Introduction and systematic assessment for IAP numerical annual climate prediction system显示文摘The IAP numerical annual climate predictionsystem has been presented in this paper. In order to evaluatethis annual prediction system, annual ensemble hindcastexperiments over a 21-year period from 1980 to 2000 havebeen done. Systematic assessment shows that this annualprediction system has higher predictability for summer cli-mate in tropic than in extra-tropic area, and higher predict-abilities over ocean than over land for the fields of precipita-tion, sea level pressure and surface air temperature; for 500hPa geopotential height field, the predictability assuming azonal distribution decreases from tropic to middle-high lati-tudes, and in China it is the highest among those of all fields.Correlation analysis shows that the prediction ability of IAPannual prediction system to summer temperature is higherthan that to precipitation, and the prediction skill can beremarkably improved by the correction system. Furthermore,the comparison between annual and extraseasonal hindcastsindicates that precipitation hindcasted extraseasonally isbetter than that done annually, and the major discrepancyexists in middle-high latitudes. | CHEN Hong, LIN Zhaohui & ZENG Qingcun International Center for Climate and Environmental Sciences (ICCES), Institute of Atnlospheric Physics, Chinese Academy of Sciences, Bcijing 100029, China | 2003 | Chinese Science Bulletin2003，48，S2： | 2 |
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