DOI: 10.1175/JCLI-D-15-0389.1
Scopus记录号: 2-s2.0-84971433378
论文题名: High-resolution climate simulations using GFDL HiRAM with a stretched global grid
作者: Harris L.M. ; Lin S.-J. ; Tu C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 11 起始页码: 4293
结束页码: 4314
语种: 英语
Scopus关键词: Hurricanes
; Storms
; Topology
; Tropics
; Diurnal effects
; Grid systems
; Numerical analysis/modeling
; Regional model
; Statistical techniques
; Tropical cyclone
; Climate models
; atmospheric modeling
; climate modeling
; computer simulation
; numerical model
; precipitation (climatology)
; statistical analysis
; tropical cyclone
; Far East
; Pacific Ocean
; Pacific Ocean (West)
; United States
英文摘要: An analytic Schmidt transformation is used to create locally refined global model grids capable of efficient climate simulation with gridcell widths as small as 10 km in the GFDL High-Resolution Atmosphere Model (HiRAM). This method of grid stretching produces a grid that varies very gradually into the region of enhanced resolution without changing the topology of the model grid and does not require radical changes to the solver. AMIP integrations were carried out with two grids stretched to 10-km minimum gridcell width: one centered over East Asia and the western Pacific warm pool, and the other over the continental United States. Robust improvements to orographic precipitation, the diurnal cycle of warm-season continental precipitation, and tropical cyclone maximum intensity were found in the region of enhanced resolution, compared to 25-km uniform-resolution HiRAM. The variations in grid size were not found to create apparent grid artifacts, and in some measures the global-mean climate improved in the stretched-grid simulations. In the enhanced-resolution regions, the number of tropical cyclones was reduced, but the fraction of storms reaching hurricane intensity increased, compared to a uniform-resolution simulation. This behavior was also found in a stretched-grid perpetual-September aquaplanet simulation with 12-km resolution over a part of the tropics. Furthermore, the stretched-grid aquaplanet simulation was also largely free of grid artifacts except for an artificial Walker-type circulation, and simulated an ITCZ in its unrefined region more resembling that of higher-resolution aquaplanet simulations, implying that the unrefined region may also be improved in stretched-grid simulations. The improvements due to stretching are attributable to improved resolution as these stretched-grid simulations were sparingly tuned. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49908
Appears in Collections: 气候变化事实与影响
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作者单位: NOAA/Geophysical Fluid Dynamics Laboratory, Princeton University, Princeton, NJ, United States; Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan
Recommended Citation:
Harris L.M.,Lin S.-J.,Tu C.. High-resolution climate simulations using GFDL HiRAM with a stretched global grid[J]. Journal of Climate,2016-01-01,29(11)