DOI: 10.1007/s00382-017-3900-x
Scopus记录号: 2-s2.0-85029473051
论文题名: On the climate model simulation of Indian monsoon low pressure systems and the effect of remote disturbances and systematic biases
作者: Levine R.C. ; Martin G.M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-11-12 起始页码: 4721
结束页码: 4743
语种: 英语
英文关键词: Global climate model
; Indian monsoon
; Low pressure systems
; Regional climate model
; Systematic bias
Scopus关键词: climate modeling
; computer simulation
; data set
; low pressure system
; monsoon
; regional climate
; India
; Pacific Ocean
; Pacific Ocean (West)
英文摘要: Monsoon low pressure systems (LPS) are synoptic-scale systems forming over the Indian monsoon trough region, contributing substantially to seasonal mean summer monsoon rainfall there. Many current global climate models (GCMs), including the Met Office Unified Model (MetUM), show deficient rainfall in this region, much of which has previously been attributed to remote systematic biases such as excessive equatorial Indian Ocean (EIO) convection, while also substantially under-representing LPS and associated rainfall as they travel westwards across India. Here the sources and sensitivities of LPS to local, remote and short-timescale forcing are examined, in order to understand the poor representation in GCMs. An LPS tracking method is presented using TRACK feature tracking software for comparison between re-analysis data-sets, MetUM GCM and regional climate model (RCM) simulations. RCM simulations, at similar horizontal resolution to the GCM and forced with re-analysis data at the lateral boundaries, are carried out with different domains to examine the effects of remote biases. The results suggest that remote biases contribute significantly to the poor simulation of LPS in the GCM. As these remote systematic biases are common amongst many current GCMs, it is likely that GCMs are intrinsically capable of representing LPS, even at relatively low resolution. The main problem areas are time-mean excessive EIO convection and poor representation of precursor disturbances transmitted from the Western Pacific. The important contribution of the latter is established using RCM simulations forced by climatological 6-hourly lateral boundary conditions, which also highlight the role of LPS in moving rainfall from steep orography towards Central India. © 2017, Crown Copyright. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109262
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Met Office Hadley Centre, Exeter, United Kingdom
Recommended Citation:
Levine R.C.,Martin G.M.. On the climate model simulation of Indian monsoon low pressure systems and the effect of remote disturbances and systematic biases[J]. Climate Dynamics,2018-01-01,50(2018-11-12)