Midlatitude atmospheric transient eddy feedbacks influenced ENSO-associated wintertime Pacific teleconnection patterns in two PDO phases
Abstract The El Nino-Southern Oscillation (ENSO)-associated wintertime atmospheric teleconnection patterns in two Pacific decadal oscillation (PDO) phases are investigated using ERA-20C reanalysis data for 1950–2010. A strengthened ENSO-associated Pacific-North American (PNA) teleconnection pattern...
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Online Access: | http://dx.doi.org/10.1007/s00382-020-05134-4 http://link.springer.com/content/pdf/10.1007/s00382-020-05134-4.pdf http://link.springer.com/article/10.1007/s00382-020-05134-4/fulltext.html |
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crspringernat:10.1007/s00382-020-05134-4 2023-05-15T18:28:32+02:00 Midlatitude atmospheric transient eddy feedbacks influenced ENSO-associated wintertime Pacific teleconnection patterns in two PDO phases Chu, Cuijiao Hu, Haibo Yang, Xiu-Qun Yang, Dejian the National Key Program for Developing Basic Science 2020 http://dx.doi.org/10.1007/s00382-020-05134-4 http://link.springer.com/content/pdf/10.1007/s00382-020-05134-4.pdf http://link.springer.com/article/10.1007/s00382-020-05134-4/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Climate Dynamics volume 54, issue 3-4, page 2577-2595 ISSN 0930-7575 1432-0894 Atmospheric Science journal-article 2020 crspringernat https://doi.org/10.1007/s00382-020-05134-4 2022-01-04T15:48:13Z Abstract The El Nino-Southern Oscillation (ENSO)-associated wintertime atmospheric teleconnection patterns in two Pacific decadal oscillation (PDO) phases are investigated using ERA-20C reanalysis data for 1950–2010. A strengthened ENSO-associated Pacific-North American (PNA) teleconnection pattern presents in PDO positive phase, while a West Pacific (WP) pattern over Northwestern Pacific and a squeezed PNA pattern coexist when ENSO occurs in PDO negative phase. The dynamical role of atmospheric transient eddy feedbacks to the teleconnection patterns are highlighted in the present study. When ENSO occurs in PDO positive phase, the uniform strengthened westerly jet anomalies downstream of the climatological main body of jet accompany with energetic transient eddy anomalies over Northeastern Pacific. The transient eddy feedbacks largely enhance and favor the strengthened PNA pattern. When ENSO occurs in PDO negative phase, the strengthened westerly jet anomalies appear to separate into two parts, one locating north of the climatological main body of jet and the other at the downstream. The accompanied transient eddy anomalies also split into two parts. Under such conditions, the transient eddy feedbacks are limited over Northeastern Pacific and favor a weak PNA pattern. However, the transient eddy anomalies over Northwestern Pacific strengthen, and the feedbacks also strengthen and largely contribute to the WP pattern. Moreover, the transient eddy anomalies over Northwestern Pacific seem to be anchored along the anomalously poleward strengthened oceanic subarctic frontal zone (SAFZ) in PDO negative phase. The enhanced atmospheric baroclinicity anomalies, coupled with the strengthened SAFZ, energize atmospheric transient eddy anomalies, and work as the potential maintenance in shaping the WP pattern. Article in Journal/Newspaper Subarctic Springer Nature (via Crossref) Pacific Climate Dynamics 54 3-4 2577 2595 |
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Springer Nature (via Crossref) |
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English |
topic |
Atmospheric Science |
spellingShingle |
Atmospheric Science Chu, Cuijiao Hu, Haibo Yang, Xiu-Qun Yang, Dejian Midlatitude atmospheric transient eddy feedbacks influenced ENSO-associated wintertime Pacific teleconnection patterns in two PDO phases |
topic_facet |
Atmospheric Science |
description |
Abstract The El Nino-Southern Oscillation (ENSO)-associated wintertime atmospheric teleconnection patterns in two Pacific decadal oscillation (PDO) phases are investigated using ERA-20C reanalysis data for 1950–2010. A strengthened ENSO-associated Pacific-North American (PNA) teleconnection pattern presents in PDO positive phase, while a West Pacific (WP) pattern over Northwestern Pacific and a squeezed PNA pattern coexist when ENSO occurs in PDO negative phase. The dynamical role of atmospheric transient eddy feedbacks to the teleconnection patterns are highlighted in the present study. When ENSO occurs in PDO positive phase, the uniform strengthened westerly jet anomalies downstream of the climatological main body of jet accompany with energetic transient eddy anomalies over Northeastern Pacific. The transient eddy feedbacks largely enhance and favor the strengthened PNA pattern. When ENSO occurs in PDO negative phase, the strengthened westerly jet anomalies appear to separate into two parts, one locating north of the climatological main body of jet and the other at the downstream. The accompanied transient eddy anomalies also split into two parts. Under such conditions, the transient eddy feedbacks are limited over Northeastern Pacific and favor a weak PNA pattern. However, the transient eddy anomalies over Northwestern Pacific strengthen, and the feedbacks also strengthen and largely contribute to the WP pattern. Moreover, the transient eddy anomalies over Northwestern Pacific seem to be anchored along the anomalously poleward strengthened oceanic subarctic frontal zone (SAFZ) in PDO negative phase. The enhanced atmospheric baroclinicity anomalies, coupled with the strengthened SAFZ, energize atmospheric transient eddy anomalies, and work as the potential maintenance in shaping the WP pattern. |
author2 |
the National Key Program for Developing Basic Science |
format |
Article in Journal/Newspaper |
author |
Chu, Cuijiao Hu, Haibo Yang, Xiu-Qun Yang, Dejian |
author_facet |
Chu, Cuijiao Hu, Haibo Yang, Xiu-Qun Yang, Dejian |
author_sort |
Chu, Cuijiao |
title |
Midlatitude atmospheric transient eddy feedbacks influenced ENSO-associated wintertime Pacific teleconnection patterns in two PDO phases |
title_short |
Midlatitude atmospheric transient eddy feedbacks influenced ENSO-associated wintertime Pacific teleconnection patterns in two PDO phases |
title_full |
Midlatitude atmospheric transient eddy feedbacks influenced ENSO-associated wintertime Pacific teleconnection patterns in two PDO phases |
title_fullStr |
Midlatitude atmospheric transient eddy feedbacks influenced ENSO-associated wintertime Pacific teleconnection patterns in two PDO phases |
title_full_unstemmed |
Midlatitude atmospheric transient eddy feedbacks influenced ENSO-associated wintertime Pacific teleconnection patterns in two PDO phases |
title_sort |
midlatitude atmospheric transient eddy feedbacks influenced enso-associated wintertime pacific teleconnection patterns in two pdo phases |
publisher |
Springer Science and Business Media LLC |
publishDate |
2020 |
url |
http://dx.doi.org/10.1007/s00382-020-05134-4 http://link.springer.com/content/pdf/10.1007/s00382-020-05134-4.pdf http://link.springer.com/article/10.1007/s00382-020-05134-4/fulltext.html |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Climate Dynamics volume 54, issue 3-4, page 2577-2595 ISSN 0930-7575 1432-0894 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s00382-020-05134-4 |
container_title |
Climate Dynamics |
container_volume |
54 |
container_issue |
3-4 |
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2577 |
op_container_end_page |
2595 |
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1766211057145085952 |