The Importance of a Properly Represented Stratosphere for Northern Hemisphere Surface Variability in the Atmosphere and the Ocean
Major sudden stratospheric warmings (SSWs) are extreme events during boreal winter, which not only impact tropospheric weather up to three months but also can influence oceanic variability through wind stress and heat flux anomalies. In the North Atlantic region, SSWs have the potential to modulate...
Published in: | Journal of Climate |
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ftoceanrep:oai:oceanrep.geomar.de:43989 2023-05-15T13:15:00+02:00 The Importance of a Properly Represented Stratosphere for Northern Hemisphere Surface Variability in the Atmosphere and the Ocean Haase, Sabine Matthes, Katja Latif, Mojib Omrani, Nour-Eddine 2018-10 text https://oceanrep.geomar.de/id/eprint/43989/ https://oceanrep.geomar.de/id/eprint/43989/1/jcli-d-17-0520.1.pdf https://oceanrep.geomar.de/id/eprint/43989/2/10.1175_JCLI-D-17-0520.s1.pdf https://doi.org/10.1175/JCLI-D-17-0520.1 en eng AMS (American Meteorological Society) https://oceanrep.geomar.de/id/eprint/43989/1/jcli-d-17-0520.1.pdf https://oceanrep.geomar.de/id/eprint/43989/2/10.1175_JCLI-D-17-0520.s1.pdf Haase, S. , Matthes, K. , Latif, M. and Omrani, N. E. (2018) The Importance of a Properly Represented Stratosphere for Northern Hemisphere Surface Variability in the Atmosphere and the Ocean. Open Access Journal of Climate, 31 (20). pp. 8481-8497. DOI 10.1175/JCLI-D-17-0520.1 <https://doi.org/10.1175/JCLI-D-17-0520.1>. doi:10.1175/JCLI-D-17-0520.1 info:eu-repo/semantics/openAccess Article PeerReviewed 2018 ftoceanrep https://doi.org/10.1175/JCLI-D-17-0520.1 2023-04-07T15:40:50Z Major sudden stratospheric warmings (SSWs) are extreme events during boreal winter, which not only impact tropospheric weather up to three months but also can influence oceanic variability through wind stress and heat flux anomalies. In the North Atlantic region, SSWs have the potential to modulate deep convection in the Labrador Sea and thereby the strength of the Atlantic meridional overturning circulation. The impact of SSWs on the Northern Hemisphere surface climate is investigated in two coupled climate models: a stratosphere-resolving (high top) and a non-stratosphere-resolving (low top) model. In both configurations, a robust link between SSWs and a negative NAO is detected, which leads to shallower-than-normal North Atlantic mixed layer depth. The frequency of SSWs and the persistence of this link is better captured in the high-top model. Significant differences occur over the Pacific region, where an unrealistically persistent Aleutian low is observed in the low-top configuration. An overrepresentation of SSWs during El Nino conditions in the low-top model is the main cause for this artifact. Our results underline the importance of a proper representation of the stratosphere in a coupled climate model for a consistent surface response in both the atmosphere and the ocean, which, among others, may have implications for oceanic deep convection in the subpolar North Atlantic. Article in Journal/Newspaper aleutian low Labrador Sea North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Journal of Climate 31 20 8481 8497 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Major sudden stratospheric warmings (SSWs) are extreme events during boreal winter, which not only impact tropospheric weather up to three months but also can influence oceanic variability through wind stress and heat flux anomalies. In the North Atlantic region, SSWs have the potential to modulate deep convection in the Labrador Sea and thereby the strength of the Atlantic meridional overturning circulation. The impact of SSWs on the Northern Hemisphere surface climate is investigated in two coupled climate models: a stratosphere-resolving (high top) and a non-stratosphere-resolving (low top) model. In both configurations, a robust link between SSWs and a negative NAO is detected, which leads to shallower-than-normal North Atlantic mixed layer depth. The frequency of SSWs and the persistence of this link is better captured in the high-top model. Significant differences occur over the Pacific region, where an unrealistically persistent Aleutian low is observed in the low-top configuration. An overrepresentation of SSWs during El Nino conditions in the low-top model is the main cause for this artifact. Our results underline the importance of a proper representation of the stratosphere in a coupled climate model for a consistent surface response in both the atmosphere and the ocean, which, among others, may have implications for oceanic deep convection in the subpolar North Atlantic. |
format |
Article in Journal/Newspaper |
author |
Haase, Sabine Matthes, Katja Latif, Mojib Omrani, Nour-Eddine |
spellingShingle |
Haase, Sabine Matthes, Katja Latif, Mojib Omrani, Nour-Eddine The Importance of a Properly Represented Stratosphere for Northern Hemisphere Surface Variability in the Atmosphere and the Ocean |
author_facet |
Haase, Sabine Matthes, Katja Latif, Mojib Omrani, Nour-Eddine |
author_sort |
Haase, Sabine |
title |
The Importance of a Properly Represented Stratosphere for Northern Hemisphere Surface Variability in the Atmosphere and the Ocean |
title_short |
The Importance of a Properly Represented Stratosphere for Northern Hemisphere Surface Variability in the Atmosphere and the Ocean |
title_full |
The Importance of a Properly Represented Stratosphere for Northern Hemisphere Surface Variability in the Atmosphere and the Ocean |
title_fullStr |
The Importance of a Properly Represented Stratosphere for Northern Hemisphere Surface Variability in the Atmosphere and the Ocean |
title_full_unstemmed |
The Importance of a Properly Represented Stratosphere for Northern Hemisphere Surface Variability in the Atmosphere and the Ocean |
title_sort |
importance of a properly represented stratosphere for northern hemisphere surface variability in the atmosphere and the ocean |
publisher |
AMS (American Meteorological Society) |
publishDate |
2018 |
url |
https://oceanrep.geomar.de/id/eprint/43989/ https://oceanrep.geomar.de/id/eprint/43989/1/jcli-d-17-0520.1.pdf https://oceanrep.geomar.de/id/eprint/43989/2/10.1175_JCLI-D-17-0520.s1.pdf https://doi.org/10.1175/JCLI-D-17-0520.1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low Labrador Sea North Atlantic |
genre_facet |
aleutian low Labrador Sea North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/43989/1/jcli-d-17-0520.1.pdf https://oceanrep.geomar.de/id/eprint/43989/2/10.1175_JCLI-D-17-0520.s1.pdf Haase, S. , Matthes, K. , Latif, M. and Omrani, N. E. (2018) The Importance of a Properly Represented Stratosphere for Northern Hemisphere Surface Variability in the Atmosphere and the Ocean. Open Access Journal of Climate, 31 (20). pp. 8481-8497. DOI 10.1175/JCLI-D-17-0520.1 <https://doi.org/10.1175/JCLI-D-17-0520.1>. doi:10.1175/JCLI-D-17-0520.1 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1175/JCLI-D-17-0520.1 |
container_title |
Journal of Climate |
container_volume |
31 |
container_issue |
20 |
container_start_page |
8481 |
op_container_end_page |
8497 |
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1766266498070872064 |