Impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting
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 diffe...
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ftcdlib:oai:escholarship.org/ark:/13030/qt3qh6r0d3 2023-05-15T17:31:42+02:00 Impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting L'Hévéder, B Codron, F Ghil, M 2650 - 2664 2015-01-01 application/pdf https://escholarship.org/uc/item/3qh6r0d3 unknown eScholarship, University of California qt3qh6r0d3 https://escholarship.org/uc/item/3qh6r0d3 public Journal of Climate, vol 28, iss 7 Meteorology & Atmospheric Sciences Atmospheric Sciences Oceanography Geomatic Engineering article 2015 ftcdlib 2021-04-16T07:11:49Z 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 in the 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 systematic northward shift of the jets, as well as of the associated Ferrel cells, storm tracks, and precipitation bands. Article in Journal/Newspaper North Atlantic Southern Ocean University of California: eScholarship Southern Ocean |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Meteorology & Atmospheric Sciences Atmospheric Sciences Oceanography Geomatic Engineering |
spellingShingle |
Meteorology & Atmospheric Sciences Atmospheric Sciences Oceanography Geomatic Engineering L'Hévéder, B Codron, F Ghil, M Impact of anomalous northward oceanic heat transport on global climate in a slab ocean setting |
topic_facet |
Meteorology & Atmospheric Sciences Atmospheric Sciences Oceanography Geomatic Engineering |
description |
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 in the 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 systematic northward shift of the jets, as well as of the associated Ferrel cells, storm tracks, and precipitation bands. |
format |
Article in Journal/Newspaper |
author |
L'Hévéder, B Codron, F Ghil, M |
author_facet |
L'Hévéder, B Codron, F Ghil, M |
author_sort |
L'Hévéder, B |
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 |
eScholarship, University of California |
publishDate |
2015 |
url |
https://escholarship.org/uc/item/3qh6r0d3 |
op_coverage |
2650 - 2664 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Journal of Climate, vol 28, iss 7 |
op_relation |
qt3qh6r0d3 https://escholarship.org/uc/item/3qh6r0d3 |
op_rights |
public |
_version_ |
1766129390215757824 |