Imperial College London
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DrPauloCeppi

Faculty of Natural Sciences, Department of Physics

Senior Lecturer in Climate Science
 
 
 
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Contact

 

+44 (0)20 7594 1710p.ceppi Website

 
 
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Location

 

725Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Tan:2017:10.1175/JCLI-D-17-0158.1,
author = {Tan, X and Bao, M and Hartmann, DL and Ceppi, P},
doi = {10.1175/JCLI-D-17-0158.1},
journal = {Journal of Climate},
pages = {10259--10274},
title = {The role of synoptic waves in the formation and maintenance of the Western Hemisphere circulation pattern},
url = {http://dx.doi.org/10.1175/JCLI-D-17-0158.1},
volume = {30},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Previous studies have demonstrated that the NAO, the leading mode of atmospheric low-frequency variability over the North Atlantic, could be linked to northeast Pacific climate variability via the downstream propagation of synoptic waves. In those studies, the NAO and the northeast Pacific climate variability are considered as two separate modes that explain the variance over the North Atlantic sector and the east Pacific–North American sector, respectively. A newly identified low-frequency atmospheric regime—the Western Hemisphere (WH) circulation pattern—provides a unique example of a mode of variability that accounts for variance over the whole North Atlantic–North American–North Pacific sector. The role of synoptic waves in the formation and maintenance of the WH pattern is investigated using the ECMWF reanalysis datasets. Persistent WH events are characterized by the propagation of quasi-stationary Rossby waves across the North Pacific–North American–North Atlantic regions and by associated storm-track anomalies. The eddy-induced low-frequency height anomalies maintain the anomalous low-frequency ridge over the Gulf of Alaska, which induces more equatorward propagation of synoptic waves on its downstream side. The eddy forcing favors the strengthening of the midlatitude jet and the deepening of the mid-to-high-latitude trough over the North Atlantic, whereas the deepening of the trough over eastern North America mostly arises from the quasi-stationary waves propagating from the North Pacific. A case study for the 2013/14 winter is examined to illustrate the downstream development of synoptic waves. The roles of synoptic waves in the formation and maintenance of the WH pattern and in linking the northeast Pacific ridge anomaly with the NAO are discussed.
AU  - Tan,X
AU  - Bao,M
AU  - Hartmann,DL
AU  - Ceppi,P
DO  - 10.1175/JCLI-D-17-0158.1
EP  - 10274
PY  - 2017///
SN  - 0894-8755
SP  - 10259
TI  - The role of synoptic waves in the formation and maintenance of the Western Hemisphere circulation pattern
T2  - Journal of Climate
UR  - http://dx.doi.org/10.1175/JCLI-D-17-0158.1
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000423492500026&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/74882
VL  - 30
ER  -
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