Dynamical framework with blocking topography coordinates for atmospheric GCM and its validation  

作　　者：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 

出　　处：《Chinese Science Bulletin》2003年第S2期9-17,共9页

摘　　要：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.The dynamical framework with Blocking To- pography Coordinates (hereafter, BTC), which is suited to handle the steep topography for the atmospheric general circulation models, is presented in this paper, together with its 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 change the kinetic energy, conservation of total available energy. The improved nonlinear iteration scheme is utilized for the time-integration. The energy conservation for BTC dynami- cal core is validated by using the integration results from 9-layer and 21-layer version respectively. Comparison results show that, the changes of the kinetic energy and total avail- able potential energy during the integration are quite close for both the BTC dynamical framework and the dynamical framework of IAP 9-level and IAP 21-level AGCM, and this may suggest that the BTC dynamical core can be used for long-term integration with good computational stability. Furthermore, the BTC dynamical core has the advantage over the terrain following (sigma) coordinates in its better representation of the influence of the large-scale topography on the atmospheric general circulation. Finally, the correct- ness and reasonableness of the BTC dynamical core has been further proved by the numerical simulation of the topogra- phy influence on the quasi-stationary planetary wave with 21-layer version of BTC dynamical framework.

关 键 词：BLOCKING TOPOGRAPHY COORDINATES ATMOSPHERIC general circulation model DYNAMICAL framework. 

分 类 号：P433[天文地球—大气科学及气象学]