globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-12-00761.1
Scopus记录号: 2-s2.0-84876894475
论文题名:
Simulating SST teleconnections to Africa: What is the state of the art?
作者: Rowell D.P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期:15
起始页码: 5397
结束页码: 5418
语种: 英语
Scopus关键词: Africa ; Atmosphere-ocean interactions ; Climate variability ; Model evaluation/performance ; Teleconnections ; Climate models ; Climatology ; Errors ; Rain ; Computer simulation ; air-sea interaction ; climate modeling ; climate variation ; climatology ; computer simulation ; error analysis ; performance assessment ; sea surface temperature ; teleconnection ; Sub-Saharan Africa
英文摘要: This study provides an overview of the state of the art of modeling SST teleconnections to Africa and begins to investigate the sources of error. Data are obtained from the Coupled Model Intercomparison Project (CMIP) archives, phases 3 and 5 (CMIP3 and CMIP5), using the "20C3M" and "historical" coupled model experiments. A systematic approach is adopted, with the scope narrowed to six large-scale regions of sub-Saharan Africa within which seasonal rainfall anomalies are reasonably coherent, along with six SST modes known to affect these regions. No significant nonstationarity of the strength of these 6X6 teleconnections is found in observations. The capability of models to represent each teleconnection is then assessed (whereby half the teleconnections have observed SST-rainfall correlations that differ significantly from zero). A few of these teleconnections are found to be relatively easy to model, while a few more pose substantial challenges to models and many others exhibit a wide variety of model skill. Furthermore, some models perform consistently better than others, with the best able to at least adequately simulate 80%-85% of the 36 teleconnections. No improvement is found between CMIP3 and CMIP5. Analysis of atmosphere-only simulations suggests that the coupled model teleconnection errors may arise primarily from errors in their SST climatology and variability, although errors in the atmospheric component of teleconnections also play a role. Last, no straightforward relationship is found between the quality of a model's teleconnection to Africa and its SST or rainfall biases or its resolution. Perhaps not surprisingly, the causes of these errors are complex, and will require considerable further investigation.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51739
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作者单位: Met Office Hadley Centre, Exeter, United Kingdom

Recommended Citation:
Rowell D.P.. Simulating SST teleconnections to Africa: What is the state of the art?[J]. Journal of Climate,2013-01-01,26(15)
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