DOI: 10.1002/jgrd.50679
论文题名: Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution
作者: Chechin D.G. ; Lüpkes C. ; Repina I.A. ; Gryanik V.M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 16 起始页码: 8787
结束页码: 8813
语种: 英语
Scopus关键词: Meteorology
; Sea ice
; Wind effects
; Cold-air outbreaks
; Geostrophic winds
; Horizontal grid spacing
; Large-scale models
; Maximum wind speed
; Mesoscale simulation
; Nonhydrostatic mesoscale models
; Nonhydrostatic model
; Computer simulation
; atmospheric forcing
; energy budget
; geostrophic flow
; momentum
; numerical model
; resolution
; sea ice
; two-dimensional modeling
; wind velocity
; Arctic
; Fram Strait
英文摘要: A nonhydrostatic model (NH3D) is used for idealized dry quasi 2-D simulations of Arctic cold-air outbreaks using horizontal grid spacings between 1.25 and 60 km. Despite the idealized setup, the model results agree well with observations over Fram Strait. It is shown that an important characteristic of the flow regime during cold-air outbreaks is an ice-breeze jet (IBJ) with a maximum wind speed exceeding often the large-scale geostrophic wind speed. According to the present simulations, which agree very well with those of another nonhydrostatic mesoscale model (METRAS), the occurrence, strength, and horizontal extent L of this jet depend strongly on the external forcing and especially on the direction of the large-scale geostrophic wind relative to the orientation of the ice edge. The latter dependency is explained by the effects of the thermally induced geostrophic wind over open water and Coriolis force. It is found that coarse-resolution runs underestimate the strength of the jet. This underestimation has important consequences to the surface fluxes of heat and momentum, which are also underestimated by about 10-15% on average over the region between the ice edge and 120-180 km downstream. Our results suggest that a grid spacing of about L/7 is required (about 10-30 km) to simulate the IBJ strength with an accuracy of at least 10%. Thus, the results of large-scale models as well might contain uncertainties with regard to the simulated IBJ strength which would influence the energy budget in a large region along the marginal sea ice zones. © 2013. Her Majesty the Queen in Right of Canada. American Geophysical Union. 资助项目: LU 818/3-1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63422
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Pyzevsky 3, Moscow 119017, Russian Federation; Satellite Oceanography Laboratory, Russian State Hydrometeorological University, St.-Petersburg, Russian Federation; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
Recommended Citation:
Chechin D.G.,Lüpkes C.,Repina I.A.,et al. Idealized dry quasi 2-D mesoscale simulations of cold-air outbreaks over the marginal sea ice zone with fine and coarse resolution[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(16)