The role of synoptic waves in the formation and maintenance of the Western Hemisphere circulation pattern
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 v...
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/74882 2023-05-15T17:27:26+02:00 The role of synoptic waves in the formation and maintenance of the Western Hemisphere circulation pattern Tan, X Bao, M Hartmann, DL Ceppi, P 2017-08-28 http://hdl.handle.net/10044/1/74882 https://doi.org/10.1175/JCLI-D-17-0158.1 English eng American Meteorological Society Journal of Climate 0894-8755 http://hdl.handle.net/10044/1/74882 doi:10.1175/JCLI-D-17-0158.1 © 2017 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses). 10274 10259 Science & Technology Physical Sciences Meteorology & Atmospheric Sciences NORTH-ATLANTIC OSCILLATION STORM-TRACK TELECONNECTION PATTERN ATMOSPHERIC CIRCULATION CLIMATE VARIABILITY TRANSIENT EDDIES ANNULAR MODES ZONAL FLOW PART I WINTER 0401 Atmospheric Sciences 0405 Oceanography 0909 Geomatic Engineering Journal Article 2017 ftimperialcol https://doi.org/10.1175/JCLI-D-17-0158.1 2020-03-12T23:38:08Z 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. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Alaska Imperial College London: Spiral Gulf of Alaska Pacific Journal of Climate 30 24 10259 10274 |
institution |
Open Polar |
collection |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
English |
topic |
Science & Technology Physical Sciences Meteorology & Atmospheric Sciences NORTH-ATLANTIC OSCILLATION STORM-TRACK TELECONNECTION PATTERN ATMOSPHERIC CIRCULATION CLIMATE VARIABILITY TRANSIENT EDDIES ANNULAR MODES ZONAL FLOW PART I WINTER 0401 Atmospheric Sciences 0405 Oceanography 0909 Geomatic Engineering |
spellingShingle |
Science & Technology Physical Sciences Meteorology & Atmospheric Sciences NORTH-ATLANTIC OSCILLATION STORM-TRACK TELECONNECTION PATTERN ATMOSPHERIC CIRCULATION CLIMATE VARIABILITY TRANSIENT EDDIES ANNULAR MODES ZONAL FLOW PART I WINTER 0401 Atmospheric Sciences 0405 Oceanography 0909 Geomatic Engineering Tan, X Bao, M Hartmann, DL Ceppi, P The role of synoptic waves in the formation and maintenance of the Western Hemisphere circulation pattern |
topic_facet |
Science & Technology Physical Sciences Meteorology & Atmospheric Sciences NORTH-ATLANTIC OSCILLATION STORM-TRACK TELECONNECTION PATTERN ATMOSPHERIC CIRCULATION CLIMATE VARIABILITY TRANSIENT EDDIES ANNULAR MODES ZONAL FLOW PART I WINTER 0401 Atmospheric Sciences 0405 Oceanography 0909 Geomatic Engineering |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Tan, X Bao, M Hartmann, DL Ceppi, P |
author_facet |
Tan, X Bao, M Hartmann, DL Ceppi, P |
author_sort |
Tan, X |
title |
The role of synoptic waves in the formation and maintenance of the Western Hemisphere circulation pattern |
title_short |
The role of synoptic waves in the formation and maintenance of the Western Hemisphere circulation pattern |
title_full |
The role of synoptic waves in the formation and maintenance of the Western Hemisphere circulation pattern |
title_fullStr |
The role of synoptic waves in the formation and maintenance of the Western Hemisphere circulation pattern |
title_full_unstemmed |
The role of synoptic waves in the formation and maintenance of the Western Hemisphere circulation pattern |
title_sort |
role of synoptic waves in the formation and maintenance of the western hemisphere circulation pattern |
publisher |
American Meteorological Society |
publishDate |
2017 |
url |
http://hdl.handle.net/10044/1/74882 https://doi.org/10.1175/JCLI-D-17-0158.1 |
geographic |
Gulf of Alaska Pacific |
geographic_facet |
Gulf of Alaska Pacific |
genre |
North Atlantic North Atlantic oscillation Alaska |
genre_facet |
North Atlantic North Atlantic oscillation Alaska |
op_source |
10274 10259 |
op_relation |
Journal of Climate 0894-8755 http://hdl.handle.net/10044/1/74882 doi:10.1175/JCLI-D-17-0158.1 |
op_rights |
© 2017 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses). |
op_doi |
https://doi.org/10.1175/JCLI-D-17-0158.1 |
container_title |
Journal of Climate |
container_volume |
30 |
container_issue |
24 |
container_start_page |
10259 |
op_container_end_page |
10274 |
_version_ |
1766119496695676928 |