Sources of uncertainty in projections of twenty-first century westerly wind changes over the Amundsen Sea, West Antarctica, in CMIP5 climate models
Sources of uncertainty in projections of twenty-first century westerly wind changes over the Amundsen Sea, West Antarctica, in CMIP5 climate models
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CMIP5 气候模型中南极洲西部阿蒙森海二十一世纪西风变化预测的不确定性来源
DOI:
10.1007/s00382-013-2032-1
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发表时间:
2014
期刊:
影响因子:
4.6
通讯作者:
Bracegirdle T
中科院分区:
文献类型:
--
作者:
Bracegirdle T
The influence of changes in winds over the Amundsen Sea has been shown to be a potentially key mechanism in explaining rapid loss of ice from major glaciers in West Antarctica, which is having a significant impact on global sea level. Here, Coupled Model Intercomparison Project Phase 5 (CMIP5) climate model data are used to assess twenty-first century projections in westerly winds over the Amundsen Sea (UAS). The importance of model uncertainty and internal climate variability in RCP4.5 and RCP8.5 scenario projections are quantified and potential sources of model uncertainty are considered. For the decade 2090–2099 the CMIP5 models show an ensemble mean twenty-first century response in annual meanUASof 0.3 and 0.7 m s−1following the RCP4.5 and RCP8.5 scenarios respectively. However, as a consequence of large internal climate variability over the Amundsen Sea, it takes until around 2030 (2065) for the RCP8.5 response to exceed one (two) standard deviation(s) of decadal internal variability. In all scenarios and seasons the model uncertainty is large. However the present-day climatological zonal wind bias over the whole South Pacific, which is important for tropical teleconnections, is strongly related to inter-model differences in projected change inUAS(more skilful models show largerUASincreases). This relationship is significant in winter (r = −0.56) and spring (r = −0.65), when the influence of the tropics on the Amundsen Sea region is known to be important. Horizontal grid spacing and present day sea ice extent are not significant sources of inter-model spread.
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DOI:
10.1002/joc.965
发表时间:
2004-01
期刊:
International Journal of Climatology
影响因子:
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DOI:
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