Wintertime ENSO influence on late spring European climate: the stratospheric response and the role of North Atlantic SST
The impact of the wintertime El Niño-Southern Oscillation (ENSO) on European late spring climate is examined using an atmospheric general circulation model of intermediate complexity. The analysis is focused on the response of the lower stratosphere/upper troposphere, downward propagation of the EN...
Published in: | International Journal of Climatology |
---|---|
Main Authors: | , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2017
|
Subjects: | |
Online Access: | http://hdl.handle.net/11585/752401 https://doi.org/10.1002/joc.4980 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-0088 |
id |
ftunibolognairis:oai:cris.unibo.it:11585/752401 |
---|---|
record_format |
openpolar |
spelling |
ftunibolognairis:oai:cris.unibo.it:11585/752401 2024-05-19T07:44:39+00:00 Wintertime ENSO influence on late spring European climate: the stratospheric response and the role of North Atlantic SST Herceg-Bulic I. Mezzina B. Kucharski F. Ruggieri P. King M. P. Herceg-Bulic I. Mezzina B. Kucharski F. Ruggieri P. King M.P. 2017 ELETTRONICO http://hdl.handle.net/11585/752401 https://doi.org/10.1002/joc.4980 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-0088 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000417298600007 volume:37 firstpage:87 lastpage:108 numberofpages:22 journal:INTERNATIONAL JOURNAL OF CLIMATOLOGY http://hdl.handle.net/11585/752401 doi:10.1002/joc.4980 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85011710573 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-0088 delayed ENSO impact European climate interaction with North Atlantic stratosphere info:eu-repo/semantics/article 2017 ftunibolognairis https://doi.org/10.1002/joc.4980 2024-04-26T00:22:03Z The impact of the wintertime El Niño-Southern Oscillation (ENSO) on European late spring climate is examined using an atmospheric general circulation model of intermediate complexity. The analysis is focused on the response of the lower stratosphere/upper troposphere, downward propagation of the ENSO signal detected in temperature, zonal wind and geopotential height and contribution of the North Atlantic to the persistence of the associated surface anomalies. It is found that the stratosphere responds to El Niño (La Niña) events with substantial warming (cooling) occurring in the polar area accompanied by a corresponding modification of upper-level geopotential heights and zonal winds resembling the pattern of the Northern Annular Mode. The atmospheric response is detected in the upper troposphere as well as at the surface where it interacts with the North Atlantic. In this way, the footprint of atmospheric wintertime ENSO signal is preserved in the ocean persisting until the following spring when it is transmitted back into the atmosphere through the sea–air interaction. Furthermore, it is showed here that the late springtime ENSO signal over Europe may be considered as a result of two contributing processes: one is a direct (spring-to-spring) ENSO influence and the other is a delayed (winter-to-spring) ENSO influence. Two processes enable the delayed ENSO impact: the persistence of the wintertime ENSO signal in the stratosphere and the atmosphere–ocean interaction in the North Atlantic. Numerical simulations indicate that the memory of the ocean mixed layer is stronger than that of the stratosphere. In this manner, the presented results emphasize the extratropical Atlantic as a contributing factor for climate variability linking wintertime atmospheric circulation associated with ENSO forcing and European climate during the following spring. Article in Journal/Newspaper North Atlantic IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) International Journal of Climatology 37 87 108 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
delayed ENSO impact European climate interaction with North Atlantic stratosphere |
spellingShingle |
delayed ENSO impact European climate interaction with North Atlantic stratosphere Herceg-Bulic I. Mezzina B. Kucharski F. Ruggieri P. King M. P. Wintertime ENSO influence on late spring European climate: the stratospheric response and the role of North Atlantic SST |
topic_facet |
delayed ENSO impact European climate interaction with North Atlantic stratosphere |
description |
The impact of the wintertime El Niño-Southern Oscillation (ENSO) on European late spring climate is examined using an atmospheric general circulation model of intermediate complexity. The analysis is focused on the response of the lower stratosphere/upper troposphere, downward propagation of the ENSO signal detected in temperature, zonal wind and geopotential height and contribution of the North Atlantic to the persistence of the associated surface anomalies. It is found that the stratosphere responds to El Niño (La Niña) events with substantial warming (cooling) occurring in the polar area accompanied by a corresponding modification of upper-level geopotential heights and zonal winds resembling the pattern of the Northern Annular Mode. The atmospheric response is detected in the upper troposphere as well as at the surface where it interacts with the North Atlantic. In this way, the footprint of atmospheric wintertime ENSO signal is preserved in the ocean persisting until the following spring when it is transmitted back into the atmosphere through the sea–air interaction. Furthermore, it is showed here that the late springtime ENSO signal over Europe may be considered as a result of two contributing processes: one is a direct (spring-to-spring) ENSO influence and the other is a delayed (winter-to-spring) ENSO influence. Two processes enable the delayed ENSO impact: the persistence of the wintertime ENSO signal in the stratosphere and the atmosphere–ocean interaction in the North Atlantic. Numerical simulations indicate that the memory of the ocean mixed layer is stronger than that of the stratosphere. In this manner, the presented results emphasize the extratropical Atlantic as a contributing factor for climate variability linking wintertime atmospheric circulation associated with ENSO forcing and European climate during the following spring. |
author2 |
Herceg-Bulic I. Mezzina B. Kucharski F. Ruggieri P. King M.P. |
format |
Article in Journal/Newspaper |
author |
Herceg-Bulic I. Mezzina B. Kucharski F. Ruggieri P. King M. P. |
author_facet |
Herceg-Bulic I. Mezzina B. Kucharski F. Ruggieri P. King M. P. |
author_sort |
Herceg-Bulic I. |
title |
Wintertime ENSO influence on late spring European climate: the stratospheric response and the role of North Atlantic SST |
title_short |
Wintertime ENSO influence on late spring European climate: the stratospheric response and the role of North Atlantic SST |
title_full |
Wintertime ENSO influence on late spring European climate: the stratospheric response and the role of North Atlantic SST |
title_fullStr |
Wintertime ENSO influence on late spring European climate: the stratospheric response and the role of North Atlantic SST |
title_full_unstemmed |
Wintertime ENSO influence on late spring European climate: the stratospheric response and the role of North Atlantic SST |
title_sort |
wintertime enso influence on late spring european climate: the stratospheric response and the role of north atlantic sst |
publishDate |
2017 |
url |
http://hdl.handle.net/11585/752401 https://doi.org/10.1002/joc.4980 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-0088 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000417298600007 volume:37 firstpage:87 lastpage:108 numberofpages:22 journal:INTERNATIONAL JOURNAL OF CLIMATOLOGY http://hdl.handle.net/11585/752401 doi:10.1002/joc.4980 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85011710573 http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-0088 |
op_doi |
https://doi.org/10.1002/joc.4980 |
container_title |
International Journal of Climatology |
container_volume |
37 |
container_start_page |
87 |
op_container_end_page |
108 |
_version_ |
1799484487114948608 |