Implications of Ural Blocking for East Asian Winter Climate in CMIP5 GCMs. Part II: Projection and Uncertainty in Future Climate Conditions

Implications of Ural Blocking for East Asian Winter Climate in CMIP5 GCMs. Part II: Projection and Uncertainty in Future Climate Conditions
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CMIP5 GCM 中乌拉尔阻塞对东亚冬季气候的影响。

DOI:
10.1175/jcli-d-14-00309.1
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发表时间:
2015-03
期刊:
影响因子:
4.9
通讯作者:
Wen Zhou
Wen Zhou
中科院分区:
地球科学2区
文献类型:
--
作者:
Cheung Hoffman H.N.;Wen Zhou

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20个CMIP 5大气环流模式中乌拉尔阻塞频率的多模式集合(MMEs)表明,在整个世纪,RCP4.5和8.5运行中乌拉尔阻塞频率没有明显的增加或减少。然而,乌拉尔阻塞指数(UBI)的一个显着的增加或减少的趋势被确定在个别的GCM中,这一趋势似乎与西伯利亚高压指数(SHI)的趋势,它措施东亚冬季气候。回归分析表明,UBI的变化趋势与欧洲-大西洋地区的上游环流有关,如大西洋急流的加强和准定常Rossby波在欧亚大陆的传播,世纪后期,UBI的年际变化与卡拉海和拉普捷夫海的大尺度环流有较强的联系。同时,在天气尺度和季节尺度上,UB可能对东亚产生更强的影响。UB的不确定性可能会对准确预测的S提出挑战。
AbstractMultiple model ensembles (MMEs) of Ural blocking frequency in 20 CMIP5 GCMs show no apparent increase or decrease in RCP4.5 and 8.5 runs throughout the twenty-first century. However, a significant increasing or decreasing trend of the Ural blocking index (UBI) is identified in individual GCMs, and the trend appears to be correlated with the trend of the Siberian high index (SHI), which measures the East Asian winter climate. Regression analyses reveal that the trend of UBI is related to upstream circulation over the Euro-Atlantic region, such as the intensification of the Atlantic jet stream and the propagation of a quasi-stationary Rossby wave across Eurasia.In the late twenty-first century, the year-to-year variation of UBI appears to show a stronger linkage with the large-scale circulation over the Kara and Laptev Seas. Meanwhile, UB likely exerts a stronger impact on East Asia on synoptic and seasonal time scales. The uncertainty of UB might present a challenge for accurate prediction of the s...
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