Impact of Anomalous Northward Oceanic Heat Transport on Global Climate in a Slab Ocean Setting
International audience This paper explores the impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting. To that end, the GCM LMDZ5A of the Laboratoire de Météorologie Dynamique is coupled to a slab ocean, with realistic zonal asymmetries and seasonal cycle. Two...
Published in: | Journal of Climate |
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Main Authors: | , , |
Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2015
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Online Access: | https://hal.science/hal-01507039 https://hal.science/hal-01507039/document https://hal.science/hal-01507039/file/L%E2%80%99H%C3%A9v%C3%A9der%20et%20al.%20-%202015%20-%20Impact%20of%20Anomalous%20Northward%20Oceanic%20Heat%20Transpo.pdf https://doi.org/10.1175/jcli-d-14-00377.1 |
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English |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology L’hévéder, Blandine Codron, Francis Ghil, Michael Impact of Anomalous Northward Oceanic Heat Transport on Global Climate in a Slab Ocean Setting |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience This paper explores the impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting. To that end, the GCM LMDZ5A of the Laboratoire de Météorologie Dynamique is coupled to a slab ocean, with realistic zonal asymmetries and seasonal cycle. Two simulations with different anomalous surface heating are imposed: 1) uniform heating over the North Atlantic basin and 2) concentrated heating inthe Gulf Stream region, with a compensating uniform cooling in the Southern Ocean in both cases. The magnitudes of the heating and of the implied northward interhemispheric heat transport are within the range of current natural variability. Both simulations show global effects that are particularly strong in the tropics, with a northward shift of the intertropical convergence zone (ITCZ) toward the heating anomalies. This shift is accompanied by a northward shift of the storm tracks in both hemispheres. From the comparison between the two simulations with different anomalous surface heating in the North Atlantic, it emerges that the global climate response is nearly insensitive to the spatial distribution of the heating. The cloud response acts as a large positive feedback on the oceanic forcing, mainly because of the low-cloud-induced shortwave anomalies in the extratropics. While previous literature has speculated that the extratropical Q flux may impact the tropics by the way of the transient eddy fluxes, it is explicitly demonstrated here. In the midlatitudes, the authors find a systemat |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 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 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) Université Paris Sciences et Lettres (PSL) |
format |
Article in Journal/Newspaper |
author |
L’hévéder, Blandine Codron, Francis Ghil, Michael |
author_facet |
L’hévéder, Blandine Codron, Francis Ghil, Michael |
author_sort |
L’hévéder, Blandine |
title |
Impact of Anomalous Northward Oceanic Heat Transport on Global Climate in a Slab Ocean Setting |
title_short |
Impact of Anomalous Northward Oceanic Heat Transport on Global Climate in a Slab Ocean Setting |
title_full |
Impact of Anomalous Northward Oceanic Heat Transport on Global Climate in a Slab Ocean Setting |
title_fullStr |
Impact of Anomalous Northward Oceanic Heat Transport on Global Climate in a Slab Ocean Setting |
title_full_unstemmed |
Impact of Anomalous Northward Oceanic Heat Transport on Global Climate in a Slab Ocean Setting |
title_sort |
impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-01507039 https://hal.science/hal-01507039/document https://hal.science/hal-01507039/file/L%E2%80%99H%C3%A9v%C3%A9der%20et%20al.%20-%202015%20-%20Impact%20of%20Anomalous%20Northward%20Oceanic%20Heat%20Transpo.pdf https://doi.org/10.1175/jcli-d-14-00377.1 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-01507039 Journal of Climate, 2015, 28 (7), pp.2650-2664. ⟨10.1175/jcli-d-14-00377.1⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1175/jcli-d-14-00377.1 hal-01507039 https://hal.science/hal-01507039 https://hal.science/hal-01507039/document https://hal.science/hal-01507039/file/L%E2%80%99H%C3%A9v%C3%A9der%20et%20al.%20-%202015%20-%20Impact%20of%20Anomalous%20Northward%20Oceanic%20Heat%20Transpo.pdf doi:10.1175/jcli-d-14-00377.1 |
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info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/jcli-d-14-00377.1 |
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Journal of Climate |
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7 |
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2664 |
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spelling |
ftecoleponts:oai:HAL:hal-01507039v1 2024-06-09T07:48:08+00:00 Impact of Anomalous Northward Oceanic Heat Transport on Global Climate in a Slab Ocean Setting L’hévéder, Blandine Codron, Francis Ghil, Michael Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 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 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) Université Paris Sciences et Lettres (PSL) 2015 https://hal.science/hal-01507039 https://hal.science/hal-01507039/document https://hal.science/hal-01507039/file/L%E2%80%99H%C3%A9v%C3%A9der%20et%20al.%20-%202015%20-%20Impact%20of%20Anomalous%20Northward%20Oceanic%20Heat%20Transpo.pdf https://doi.org/10.1175/jcli-d-14-00377.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/jcli-d-14-00377.1 hal-01507039 https://hal.science/hal-01507039 https://hal.science/hal-01507039/document https://hal.science/hal-01507039/file/L%E2%80%99H%C3%A9v%C3%A9der%20et%20al.%20-%202015%20-%20Impact%20of%20Anomalous%20Northward%20Oceanic%20Heat%20Transpo.pdf doi:10.1175/jcli-d-14-00377.1 info:eu-repo/semantics/OpenAccess ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-01507039 Journal of Climate, 2015, 28 (7), pp.2650-2664. ⟨10.1175/jcli-d-14-00377.1⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2015 ftecoleponts https://doi.org/10.1175/jcli-d-14-00377.1 2024-05-16T13:21:43Z International audience This paper explores the impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting. To that end, the GCM LMDZ5A of the Laboratoire de Météorologie Dynamique is coupled to a slab ocean, with realistic zonal asymmetries and seasonal cycle. Two simulations with different anomalous surface heating are imposed: 1) uniform heating over the North Atlantic basin and 2) concentrated heating inthe Gulf Stream region, with a compensating uniform cooling in the Southern Ocean in both cases. The magnitudes of the heating and of the implied northward interhemispheric heat transport are within the range of current natural variability. Both simulations show global effects that are particularly strong in the tropics, with a northward shift of the intertropical convergence zone (ITCZ) toward the heating anomalies. This shift is accompanied by a northward shift of the storm tracks in both hemispheres. From the comparison between the two simulations with different anomalous surface heating in the North Atlantic, it emerges that the global climate response is nearly insensitive to the spatial distribution of the heating. The cloud response acts as a large positive feedback on the oceanic forcing, mainly because of the low-cloud-induced shortwave anomalies in the extratropics. While previous literature has speculated that the extratropical Q flux may impact the tropics by the way of the transient eddy fluxes, it is explicitly demonstrated here. In the midlatitudes, the authors find a systemat Article in Journal/Newspaper North Atlantic Southern Ocean École des Ponts ParisTech: HAL Southern Ocean Journal of Climate 28 7 2650 2664 |