Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-016-3337-7 |
Sources of errors in the simulation of south Asian summer monsoon in the CMIP5 GCMs | |
Ashfaq, Moetasim1; Rastogi, Deeksha1; Mei, Rui1; Touma, Danielle1,2; Leung, L. Ruby3 | |
2017-07-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 49 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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. |
英文关键词 | South Asian monsoon CMIP5 Land-atmosphere interactions |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403716500012 |
WOS关键词 | SNOW COVER ; CLIMATE MODEL ; PRECIPITATION ; RAINFALL ; MOISTURE ; DEPRESSIONS ; VARIABILITY ; PREDICTION ; DATASET ; SEASON |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36419 |
专题 | 气候变化 |
作者单位 | 1.Oak Ridge Natl Lab, Climate Change Sci Inst, POB 2008 MS6301, Oak Ridge, TN 37831 USA; 2.Stanford Univ, Dept Earth Syst Sci, Stanford, CA 94305 USA; 3.Pacific Northwest Natl Lab, Atmospher Sci & Global Change Div, Richland, WA USA |
推荐引用方式 GB/T 7714 | Ashfaq, Moetasim,Rastogi, Deeksha,Mei, Rui,et al. Sources of errors in the simulation of south Asian summer monsoon in the CMIP5 GCMs[J]. CLIMATE DYNAMICS,2017,49. |
APA | Ashfaq, Moetasim,Rastogi, Deeksha,Mei, Rui,Touma, Danielle,&Leung, L. Ruby.(2017).Sources of errors in the simulation of south Asian summer monsoon in the CMIP5 GCMs.CLIMATE DYNAMICS,49. |
MLA | Ashfaq, Moetasim,et al."Sources of errors in the simulation of south Asian summer monsoon in the CMIP5 GCMs".CLIMATE DYNAMICS 49(2017). |
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