Advection errors in an orthogonal terrain-following coordinate: idealized 2-D experiments using steep terrains

作者：Zou, Xun; Li, Yiyuan^*; Li, Jinxi; Wang, Bin

来源：Atmospheric Science Letters, 2016, 17(3): 243-250.

DOI：10.1002/asl.650

• terrain-following coordinate
• advection errors
• smoothed vertical layers
• orthogonal computational grids
• skewness
• steep terrain

This study illustrated the importance of smoothed vertical layers and orthogonal grids in an orthogonal terrain-following coordinate (an OTF-coordinate) in reducing advection errors over steep terrain. Three coordinates, namely, classic terrain-following coordinate, hybrid terrain-following coordinate (HTF-coordinate) and OTF-coordinate, were employed in Schar-type advection experiments for various terrains. The results demonstrated that the OTF-coordinate could diminish the grids with high skewness in the HTF-coordinate over steep terrain; the orthogonal grids share the same importance in reducing advection errors with smoothed vertical layers. Therefore, the advection errors in the OTF-coordinate are considerably reduced than those in the corresponding HTF-coordinate over steep terrain.

• 出版日期2016-3
• 单位中国科学院大气物理研究所; 南京大学; 清华大学