气象学报Issue(6)：1089-1102,14.DOI:10.11676/qxxb2013.085
两步保形平流方案在高分辨率球面经纬网格下的跳点差分试验
摘要
Abstract
A finite difference based Two-step Shape Preserving Advection Scheme (TSPAS)was ported into an Eulerian-Spec-tral dynamical core of National Center for Atmospheric Research (NCAR)-Community Atmospheric Model 5 (CAM5 ),to re-place the original Semi-Lagrangian Transport (SLT)scheme for resolving the advection equation under different resolutions.A leaping-point TSPAS is designed to increase the time-step which is too short as limited by the extremely high zonal resolution in the high-latitude regions of a high-resolution model.The TSPAS can thus,accommodate to large time-step.The results of sol-id body rotation tests suggest:(1 )the leaping-point TSPAS maintains the conservation,shape-preserving and numerical preci-sion of the original TSPAS,but with a large increase on time-step;(2)although the numerical diffusion is larger in the TSPAS than that in the SLT,the TSPAS run is less time consuming and improves the conservation of the transported scalar.The sim-ulation in CAM5 suggests:(1)the results are similar in leaping-point and original TSPAS runs,and there is no anomaly in high-latitude regions;(2 )in high-resolution simulation,CAM5-TSPAS and CAM5-SLT also exhibit similar results,but CAM5-TSPAS shows an improvement of precipitation in the southern side of the Tibetan Plateau.This work ensures a stable large-time-step integration of CAM5-TSPAS in its high-resolution simulation,presents an enlightenment for using finite differ-ence based advection scheme in a high-resolution model and lays a basis for improving model performance in East Asia.关键词
跳点差分/两步保形平流方案/半拉格朗日传输/CAM5/高分辨率模式Key words
Leaping-point difference/TSPAS/Semi-Lagrangian transport/CAM5/High-resolution model分类
天文与地球科学引用本文复制引用
张祎,宇如聪,李建,陈昊明..两步保形平流方案在高分辨率球面经纬网格下的跳点差分试验[J].气象学报,2013,(6):1089-1102,14.基金项目
资助课题高分辨率气候系统模式的研制与评估（2010CB951900）。 （）
