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DOI | 10.1175/JCLI-D-16-0262.1 |
Increased Quasi Stationarity and Persistence of Winter Ural Blocking and Eurasian Extreme Cold Events in Response to Arctic Warming. Part II: A Theoretical Explanation | |
Luo, Dehai1; Yao, Yao1; Dai, Aiguo2,3; Simmonds, Ian4; Zhong, Linhao1 | |
2017-05-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA; Australia |
英文摘要 | In Part I of this study, it was shown that the Eurasian cold anomalies related to Arctic warming depend strongly on the quasi stationarity and persistence of the Ural blocking (UB). The analysis here revealed that under weak mean westerly wind (MWW) and vertical shear (VS) (quasi barotropic) conditions with weak synoptic-scale eddies and a large planetary wave anomaly, the growth of UBis slow and its amplitude is small. For this case, a quasi-stationary and persistent UB is seen. However, under strong MWW and VS (quasi baroclinic) conditions, synoptic-scale eddies are stronger and the growth of UB is rapid; the resulting UB is less persistent and has large amplitude. In this case, a marked retrogression of the UB is observed. The dynamical mechanism behind the dependence of the movement and persistence of UB upon the background conditions is further examined using a nonlinear multiscale model. The results show that when the blocking has large amplitude under quasi-baroclinic conditions, the blocking-induced westward displacement greatly exceeds the strong mean zonal-wind-induced eastward movement and hence generates a marked retrogression of the blocking. By contrast, under quasi-barotropic conditions because the UB amplitude is relatively small the blocking-induced westward movement is less distinct, giving rise to a quasistationary and persistent blocking. It is further shown that the strong mid-high-latitude North Atlantic mean zonal wind is the quasi-barotropic condition that suppresses UB's retrogression and thus is conducive to the quasi stationarity and persistence of the UB. The model results show that the blocking duration is longer when the mean zonal wind in the blocking region or eddy strength is weaker. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000401006100003 |
WOS关键词 | SYNOPTIC-SCALE EDDIES ; ATMOSPHERIC BLOCKING ; SEA-ICE ; MIDLATITUDE WEATHER ; MODEL ; AMPLIFICATION ; CYCLES ; IMPACT ; WAVES |
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/19561 |
专题 | 气候变化 |
作者单位 | 1.Chinese Acad Sci, Inst Atmospher Phys, Key Lab Reg Climate Environm Temperate East Asia, Beijing, Peoples R China; 2.SUNY Albany, Dept Atmospher & Environm Sci, Albany, NY 12222 USA; 3.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA; 4.Univ Melbourne, Sch Earth Sci, Parkville, Vic, Australia |
推荐引用方式 GB/T 7714 | Luo, Dehai,Yao, Yao,Dai, Aiguo,et al. Increased Quasi Stationarity and Persistence of Winter Ural Blocking and Eurasian Extreme Cold Events in Response to Arctic Warming. Part II: A Theoretical Explanation[J]. JOURNAL OF CLIMATE,2017,30(10). |
APA | Luo, Dehai,Yao, Yao,Dai, Aiguo,Simmonds, Ian,&Zhong, Linhao.(2017).Increased Quasi Stationarity and Persistence of Winter Ural Blocking and Eurasian Extreme Cold Events in Response to Arctic Warming. Part II: A Theoretical Explanation.JOURNAL OF CLIMATE,30(10). |
MLA | Luo, Dehai,et al."Increased Quasi Stationarity and Persistence of Winter Ural Blocking and Eurasian Extreme Cold Events in Response to Arctic Warming. Part II: A Theoretical Explanation".JOURNAL OF CLIMATE 30.10(2017). |
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