North Atlantic climate variability in coupled models and data
International audience We show that the observed zonally averaged jet in the Northern Hemisphere atmosphere exhibits two spatial patterns with broadband variability in the decadal and inter-decadal range; these patterns are consistent with an important role of local, mid-latitude ocean–atmosphere co...
Published in: | Nonlinear Processes in Geophysics |
---|---|
Main Authors: | , , , , |
Other Authors: | , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2008
|
Subjects: | |
Online Access: | https://hal.science/hal-00331109 https://hal.science/hal-00331109/document https://hal.science/hal-00331109/file/npg-15-13-2008.pdf https://doi.org/10.5194/npg-15-13-2008 |
id |
ftinsu:oai:HAL:hal-00331109v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-00331109v1 2023-11-12T04:22:01+01:00 North Atlantic climate variability in coupled models and data Kravtsov, S. K. Dewar, W. K. Ghil, M. Berloff, P. S. Mcwilliams, J. C. Department of Mathematical Sciences University of Wisconsin - Milwaukee Department of Atmospheric and Oceanic Sciences Los Angeles (AOS) University of California Los Angeles (UCLA) University of California (UC)-University of California (UC) Dept. of Oceanography Florida State University Tallahassee (FSU) Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) Dept. of Physical Oceanography Woods Hole Oceanographic Institution (WHOI) DAMTP 2008-01-18 https://hal.science/hal-00331109 https://hal.science/hal-00331109/document https://hal.science/hal-00331109/file/npg-15-13-2008.pdf https://doi.org/10.5194/npg-15-13-2008 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/npg-15-13-2008 hal-00331109 https://hal.science/hal-00331109 https://hal.science/hal-00331109/document https://hal.science/hal-00331109/file/npg-15-13-2008.pdf doi:10.5194/npg-15-13-2008 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1023-5809 EISSN: 1607-7946 Nonlinear Processes in Geophysics https://hal.science/hal-00331109 Nonlinear Processes in Geophysics, 2008, 15 (1), pp.13-24. ⟨10.5194/npg-15-13-2008⟩ [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2008 ftinsu https://doi.org/10.5194/npg-15-13-2008 2023-10-25T16:24:16Z International audience We show that the observed zonally averaged jet in the Northern Hemisphere atmosphere exhibits two spatial patterns with broadband variability in the decadal and inter-decadal range; these patterns are consistent with an important role of local, mid-latitude ocean–atmosphere coupling. A key aspect of this behaviour is the fundamentally nonlinear bi-stability of the atmospheric jet's latitudinal position, which enables relatively small sea-surface temperature anomalies associated with ocean processes to affect the large-scale atmospheric winds. The wind anomalies induce, in turn, complex three-dimensional anomalies in the ocean's main thermocline; in particular, they may be responsible for recently reported cooling of the upper ocean. Both observed modes of variability, decadal and inter-decadal, have been found in our intermediate climate models. One mode resembles North Atlantic tri-polar sea-surface temperature (SST) patterns described elsewhere. The other mode, with mono-polar SST pattern, is novel; its key aspects include interaction of oceanic turbulence with the large-scale oceanic flow. To the extent these anomalies exist, the interpretation of observed climate variability in terms of natural and human-induced changes will be affected. Coupled mid-latitude ocean-atmosphere modes do, however, suggest some degree of predictability is possible. Article in Journal/Newspaper North Atlantic Institut national des sciences de l'Univers: HAL-INSU Nonlinear Processes in Geophysics 15 1 13 24 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Kravtsov, S. K. Dewar, W. K. Ghil, M. Berloff, P. S. Mcwilliams, J. C. North Atlantic climate variability in coupled models and data |
topic_facet |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We show that the observed zonally averaged jet in the Northern Hemisphere atmosphere exhibits two spatial patterns with broadband variability in the decadal and inter-decadal range; these patterns are consistent with an important role of local, mid-latitude ocean–atmosphere coupling. A key aspect of this behaviour is the fundamentally nonlinear bi-stability of the atmospheric jet's latitudinal position, which enables relatively small sea-surface temperature anomalies associated with ocean processes to affect the large-scale atmospheric winds. The wind anomalies induce, in turn, complex three-dimensional anomalies in the ocean's main thermocline; in particular, they may be responsible for recently reported cooling of the upper ocean. Both observed modes of variability, decadal and inter-decadal, have been found in our intermediate climate models. One mode resembles North Atlantic tri-polar sea-surface temperature (SST) patterns described elsewhere. The other mode, with mono-polar SST pattern, is novel; its key aspects include interaction of oceanic turbulence with the large-scale oceanic flow. To the extent these anomalies exist, the interpretation of observed climate variability in terms of natural and human-induced changes will be affected. Coupled mid-latitude ocean-atmosphere modes do, however, suggest some degree of predictability is possible. |
author2 |
Department of Mathematical Sciences University of Wisconsin - Milwaukee Department of Atmospheric and Oceanic Sciences Los Angeles (AOS) University of California Los Angeles (UCLA) University of California (UC)-University of California (UC) Dept. of Oceanography Florida State University Tallahassee (FSU) Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) Dept. of Physical Oceanography Woods Hole Oceanographic Institution (WHOI) DAMTP |
format |
Article in Journal/Newspaper |
author |
Kravtsov, S. K. Dewar, W. K. Ghil, M. Berloff, P. S. Mcwilliams, J. C. |
author_facet |
Kravtsov, S. K. Dewar, W. K. Ghil, M. Berloff, P. S. Mcwilliams, J. C. |
author_sort |
Kravtsov, S. K. |
title |
North Atlantic climate variability in coupled models and data |
title_short |
North Atlantic climate variability in coupled models and data |
title_full |
North Atlantic climate variability in coupled models and data |
title_fullStr |
North Atlantic climate variability in coupled models and data |
title_full_unstemmed |
North Atlantic climate variability in coupled models and data |
title_sort |
north atlantic climate variability in coupled models and data |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00331109 https://hal.science/hal-00331109/document https://hal.science/hal-00331109/file/npg-15-13-2008.pdf https://doi.org/10.5194/npg-15-13-2008 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1023-5809 EISSN: 1607-7946 Nonlinear Processes in Geophysics https://hal.science/hal-00331109 Nonlinear Processes in Geophysics, 2008, 15 (1), pp.13-24. ⟨10.5194/npg-15-13-2008⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/npg-15-13-2008 hal-00331109 https://hal.science/hal-00331109 https://hal.science/hal-00331109/document https://hal.science/hal-00331109/file/npg-15-13-2008.pdf doi:10.5194/npg-15-13-2008 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/npg-15-13-2008 |
container_title |
Nonlinear Processes in Geophysics |
container_volume |
15 |
container_issue |
1 |
container_start_page |
13 |
op_container_end_page |
24 |
_version_ |
1782337197179928576 |