DOI: 10.1175/JCLI-D-12-00012.1
Scopus记录号: 2-s2.0-84872977130
论文题名: Investigating global tropical cyclone activity with a hierarchy of AGCMs: The role of model resolution
作者: Strachan J. ; Vidale P.L. ; Hodges K. ; Roberts M. ; Demory M.-E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 1 起始页码: 133
结束页码: 152
语种: 英语
Scopus关键词: Absolute vorticity
; Ensemble simulation
; Environmental conditions
; Environmental factors
; Feature-tracking
; General circulation model
; High resolution
; Horizontal resolution
; Interannual variability
; Model formulation
; Model hierarchy
; Model resolution
; North Atlantic
; North Pacific
; Northern Hemispheres
; Realistic simulation
; Spatial resolution
; Storm intensity
; Storm occurrences
; Tropical cyclogenesis
; Tropical cyclone
; Tropical cyclone activity
; Vertical wind shear
; Climate change
; Climate models
; Computer simulation
; Storms
; Hurricanes
; algorithm
; annual variation
; atmospheric general circulation model
; computer simulation
; environmental conditions
; Northern Hemisphere
; numerical model
; relative humidity
; spatial resolution
; tropical cyclone
; vorticity
; wind shear
英文摘要: The ability to run general circulation models (GCMs) at ever-higher horizontal resolutions has meant that tropical cyclone simulations are increasingly credible. A hierarchy of atmosphere-only GCMs, based on the Hadley Centre Global EnvironmentalModel version 1 (HadGEM1) with horizontal resolution increasing from approximately 270 to 60 km at 50°N, is used to systematically investigate the impact of spatial resolution on the simulation of global tropical cyclone activity, independent of model formulation. Tropical cyclones are extracted from ensemble simulations and reanalyses of comparable resolutions using a feature-tracking algorithm. Resolution is critical for simulating storm intensity and convergence to observed storm intensities is not achieved with the model hierarchy. Resolution is less critical for simulating the annual number of tropical cyclones and their geographical distribution, which are well captured at resolutions of 135 km or higher, particularly for Northern Hemisphere basins. Simulating the interannual variability of storm occurrence requires resolutions of 100 km or higher; however, the level of skill is basin dependent.Higher resolutionGCMsare increasingly able to capture the interannual variability of the large-scale environmental conditions that contribute to tropical cyclogenesis. Different environmental factors contribute to the interannual variability of tropical cyclones in the different basins: in the North Atlantic basin the vertical wind shear, potential intensity, and low-level absolute vorticity are dominant, whereas in the North Pacific basins midlevel relative humidity and low-level absolute vorticity are dominant.Model resolution is crucial for a realistic simulation of tropical cyclone behavior, and high-resolution GCMs are found to be valuable tools for investigating the global location and frequency of tropical cyclones. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52087
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, United Kingdom; NERC Centre for Earth Observation, University of Reading, Reading, United Kingdom; Met Office, Hadley Centre, Exeter, United Kingdom; National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Strachan J.,Vidale P.L.,Hodges K.,et al. Investigating global tropical cyclone activity with a hierarchy of AGCMs: The role of model resolution[J]. Journal of Climate,2013-01-01,26(1)