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DOI | 10.1175/JAS-D-18-0071.1 |
Understanding Anomalous Synoptic Eddy Vorticity Forcing in Pacific-North American Teleconnection Pattern Events | |
Jie Song | |
2018-12-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:12页码:4287-4312 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Utilizing a decomposition of anomalous eddy vorticity forcing (EVF) proposed by Song in 2016 and a modified Geophysical Fluid Dynamics Laboratory (GFDL) dynamical core atmospheric model, this study provides a different understanding of physical mechanisms that are responsible for the formation of the anomalous synoptic EVF (SEVF) associated with Pacific-North American teleconnection pattern (PNA) events. A series of short-term control experiments (CEs) and initial-value modified experiments (IVMEs) is conducted. In each case of CEs, there are no obvious PNA-like circulation anomalies. IVMEs are exactly the same as CEs except that appropriate small perturbations are introduced into the initial-value fields of CEs. The modified initial-value fields led to a gradual development of the PNA-like flow anomalies in IVMEs. Based on these numerical results, deformations of the synoptic eddy psi(D)' due to the emergence of the PNA pattern can be easily acquired by subtracting the synoptic eddy in CEs psi(C)' from the synoptic eddy in IVMEs psi(1)'. The anomalous SEVF associated with the PNA events in the model can be decomposed into ensembles of two linear psi(C)' and psi(D)' interaction terms (EVF1 and EVF2) and a nonlinear psi(D)' self-interaction term (EVF3). It is demonstrated that the physical essence of the anomalous SEVF associated with the PNA events is a competition result between EVF1 plus EVF2 and EVF3. Results also indicate that the different signs of SEVF associated with the positive and negative PNA events are not necessarily related to the different tilts of the synoptic eddy. |
英文关键词 | Dynamics Eddies Feedback Nonlinear dynamics Pacific-North American pattern oscillation |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000451374200001 |
WOS关键词 | PART I ; HEMISPHERE WINTER ; STORM TRACKS ; LIFE-CYCLES ; TIME-SCALE ; DYNAMICS ; MECHANISMS ; GROWTH ; MODEL ; PNA |
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/29677 |
专题 | 地球科学 |
作者单位 | Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Jie Song. Understanding Anomalous Synoptic Eddy Vorticity Forcing in Pacific-North American Teleconnection Pattern Events[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(12):4287-4312. |
APA | Jie Song.(2018).Understanding Anomalous Synoptic Eddy Vorticity Forcing in Pacific-North American Teleconnection Pattern Events.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(12),4287-4312. |
MLA | Jie Song."Understanding Anomalous Synoptic Eddy Vorticity Forcing in Pacific-North American Teleconnection Pattern Events".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.12(2018):4287-4312. |
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