DOI: 10.1007/s00382-016-3337-7
Scopus记录号: 2-s2.0-84988353054
论文题名: Sources of errors in the simulation of south Asian summer monsoon in the CMIP5 GCMs
作者: Ashfaq M. ; Rastogi D. ; Mei R. ; Touma D. ; Ruby Leung L.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 2017-01-02 起始页码: 193
结束页码: 223
语种: 英语
英文关键词: CMIP5
; Land–atmosphere interactions
; South Asian monsoon
英文摘要: Accurate simulation of the South Asian summer monsoon (SAM) is still an unresolved challenge. There has not been a benchmark effort to decipher the origin of undesired yet virtually invariable unsuccessfulness of general circulation models (GCMs) over this region. This study analyzes a large ensemble of CMIP5 GCMs to show that most of the simulation errors in the precipitation distribution and their driving mechanisms are systematic and of similar nature across the GCMs, with biases in meridional differential heating playing a critical role in determining the timing of monsoon onset over land, the magnitude of seasonal precipitation distribution and the trajectories of monsoon depressions. Errors in the pre-monsoon heat low over the lower latitudes and atmospheric latent heating over the slopes of Himalayas and Karakoram Range induce significant errors in the atmospheric circulations and meridional differential heating. Lack of timely precipitation further exacerbates such errors by limiting local moisture recycling and latent heating aloft from convection. Most of the summer monsoon errors and their sources are reproducible in the land–atmosphere configuration of a GCM when it is configured at horizontal grid spacing comparable to the CMIP5 GCMs. While an increase in resolution overcomes many modeling challenges, coarse resolution is not necessarily the primary driver in the exhibition of errors over South Asia. These results highlight the importance of previously less well known pre-monsoon mechanisms that critically influence the strength of SAM in the GCMs and highlight the importance of land–atmosphere interactions in the development and maintenance of SAM. © 2016, Springer-Verlag Berlin Heidelberg.
资助项目: ORNL, Oak Ridge National Laboratory
; DOE, U.S. Department of Energy
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53155
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Climate Change Science Institute, Oak Ridge National Laboratory, PO Box 2008 MS6301, Oak Ridge, TN, United States; Department of Earth System Science, Stanford University, Stanford, CA, United States; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States
Recommended Citation:
Ashfaq M.,Rastogi D.,Mei R.,et al. Sources of errors in the simulation of south Asian summer monsoon in the CMIP5 GCMs[J]. Climate Dynamics,2017-01-01,49(2017-01-02)