DOI: 10.1007/s00382-012-1658-8
Scopus记录号: 2-s2.0-84879507458
论文题名: High resolution simulation of the South Asian monsoon using a variable resolution global climate model
作者: P Sabin T. ; Krishnan R. ; Ghattas J. ; Denvil S. ; Dufresne J.-L. ; Hourdin F. ; Pascal T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 1 起始页码: 173
结束页码: 194
语种: 英语
英文关键词: High-resolution variable-grid LMDZ model
; Moist-convective processes
; Scale interactions
; South Asian monsoon
英文摘要: This study examines the feasibility of using a variable resolution global general circulation model (GCM), with telescopic zooming and enhanced resolution (~35 km) over South Asia, to better understand regional aspects of the South Asian monsoon rainfall distribution and the interactions between monsoon circulation and precipitation. For this purpose, two sets of ten member realizations are produced with and without zooming using the LMDZ (Laboratoire Meteorologie Dynamique and Z stands for zoom) GCM. The simulations without zoom correspond to a uniform 1° × 1° grid with the same total number of grid points as in the zoom version. So the grid of the zoomed simulations is finer inside the region of interest but coarser outside. The use of these finer and coarser resolution ensemble members allows us to examine the impact of resolution on the overall quality of the simulated regional monsoon fields. It is found that the monsoon simulation with high-resolution zooming greatly improves the representation of the southwesterly monsoon flow and the heavy precipitation along the narrow orography of the Western Ghats, the northeastern mountain slopes and northern Bay of Bengal (BOB). A realistic Monsoon Trough (MT) is also noticed in the zoomed simulation, together with remarkable improvements in representing the associated precipitation and circulation features, as well as the large-scale organization of meso-scale convective systems over the MT region. Additionally, a more reasonable simulation of the monsoon synoptic disturbances (lows and disturbances) along the MT is noted in the high-resolution zoomed simulation. On the other hand, the no-zoom version has limitations in capturing the depressions and their movement, so that the MT zone is relatively dry in this case. Overall, the results from this work demonstrate the usefulness of the high-resolution variable resolution LMDZ model in realistically capturing the interactions among the monsoon large-scale dynamics, the synoptic systems and the meso-scale convective systems, which are essential elements of the South Asian monsoon system. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54862
Appears in Collections: 过去全球变化的重建
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作者单位: Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India; Laboratoire Meteorologie Dynamique, IPSL, Paris, France; LOCEAN, IPSL, Paris, France
Recommended Citation:
P Sabin T.,Krishnan R.,Ghattas J.,et al. High resolution simulation of the South Asian monsoon using a variable resolution global climate model[J]. Climate Dynamics,2013-01-01,41(1)