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DOI | 10.1175/JCLI-D-18-0043.1 |
On the Inverse Relationship between the Boreal Wintertime Pacific Jet Strength and Storm-Track Intensity | |
Zhao, Yuan-Bing1; Liang, X. San2,3 | |
2018-12-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:23页码:9545-9564 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Previous studies show that in boreal winters when the Pacific jet is extremely strong, the Pacific storm track is, however, unexpectedly weak. Using a recently developed technique, namely, the multiscale window transform (MWT), and the MWT-based localized multiscale energetics analysis, we investigate in this study the underlying mechanism of this counterintuitive phenomenon, based on ERA-40 data. It is found that most of the synoptic storms are generated at latitudes far north of the jet core, which lowers the relevance of the jet strength to the storm-track intensity, and the inverse relationship between the Pacific jet strength and storm-track intensity is mainly attributed to the internal dynamics. In the strong jet state, on one hand, the jet is narrow, and thus the jet winds at high latitudes are weak, resulting in weak baroclinic instabilities and hence reduced eddy growth rate; on the other hand, although baroclinic instabilities are strong at the jet core, inverse kinetic energy (KE) cascades are even stronger (by 43%). The resultant effect is that more eddy energy is transferred back to the background flow, leaving an overall weak storm track in a strong Pacific jet. In addition, diabatic processes are found to account for the inverse relationship: it is greatly weakened (by 25%) in the strong-core jet state. Apart from these, we also find that the role that barotropic canonical transfer plays in the inverse relationship is opposite to that in the formation of the midwinter minimum (MWM), another counterintuitive phenomenon in the Pacific storm track. |
英文关键词 | Baroclinic flows Dynamics Large-scale motions Jets Storm tracks Energy budget balance |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000449463500003 |
WOS关键词 | LOCALIZED MULTISCALE ENERGY ; NORTHERN-HEMISPHERE ; MIDWINTER SUPPRESSION ; BAROCLINIC WAVES ; VORTICITY ANALYSIS ; VARIABILITY ; DYNAMICS ; CYCLOGENESIS ; INSTABILITY ; ATLANTIC |
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/19860 |
专题 | 气候变化 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Sch Atmospher Sci, Nanjing, Jiangsu, Peoples R China; 2.Nanjing Univ Informat Sci & Technol, Sch Marine Sci, Nanjing, Jiangsu, Peoples R China; 3.Nanjing Univ Informat Sci & Technol, Sch Atmospher Sci, Nanjing, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | Zhao, Yuan-Bing,Liang, X. San. On the Inverse Relationship between the Boreal Wintertime Pacific Jet Strength and Storm-Track Intensity[J]. JOURNAL OF CLIMATE,2018,31(23):9545-9564. |
APA | Zhao, Yuan-Bing,&Liang, X. San.(2018).On the Inverse Relationship between the Boreal Wintertime Pacific Jet Strength and Storm-Track Intensity.JOURNAL OF CLIMATE,31(23),9545-9564. |
MLA | Zhao, Yuan-Bing,et al."On the Inverse Relationship between the Boreal Wintertime Pacific Jet Strength and Storm-Track Intensity".JOURNAL OF CLIMATE 31.23(2018):9545-9564. |
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