Variability of the ocean heat content during the last millennium – an assessment with the ECHO-g Model
Studies addressing climate variability during the last millennium generally focus on variables with a direct influence on climate variability, like the fast thermal response to varying radiative forcing, or the large-scale changes in atmospheric dynamics (e.g. North Atlantic Oscillation). The ocean...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:2e428bf4980d4ff1b5a38b69a7668c9d 2023-05-15T17:32:00+02:00 Variability of the ocean heat content during the last millennium – an assessment with the ECHO-g Model P. Ortega M. Montoya F. González-Rouco H. Beltrami D. Swingedouw 2013-03-01 https://doi.org/10.5194/cp-9-547-2013 http://www.clim-past.net/9/547/2013/cp-9-547-2013.pdf https://doaj.org/article/2e428bf4980d4ff1b5a38b69a7668c9d en eng Copernicus Publications doi:10.5194/cp-9-547-2013 1814-9324 1814-9332 http://www.clim-past.net/9/547/2013/cp-9-547-2013.pdf https://doaj.org/article/2e428bf4980d4ff1b5a38b69a7668c9d undefined Climate of the Past, Vol 9, Iss 2, Pp 547-565 (2013) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.5194/cp-9-547-2013 2023-01-22T18:11:02Z Studies addressing climate variability during the last millennium generally focus on variables with a direct influence on climate variability, like the fast thermal response to varying radiative forcing, or the large-scale changes in atmospheric dynamics (e.g. North Atlantic Oscillation). The ocean responds to these variations by slowly integrating in depth the upper heat flux changes, thus producing a delayed influence on ocean heat content (OHC) that can later impact low frequency SST (sea surface temperature) variability through reemergence processes. In this study, both the externally and internally driven variations of the OHC during the last millennium are investigated using a set of fully coupled simulations with the ECHO-G (coupled climate model ECHAMA4 and ocean model HOPE-G) atmosphere–ocean general circulation model (AOGCM). When compared to observations for the last 55 yr, the model tends to overestimate the global trends and underestimate the decadal OHC variability. Extending the analysis back to the last one thousand years, the main impact of the radiative forcing is an OHC increase at high latitudes, explained to some extent by a reduction in cloud cover and the subsequent increase of short-wave radiation at the surface. This OHC response is dominated by the effect of volcanism in the preindustrial era, and by the fast increase of GHGs during the last 150 yr. Likewise, salient impacts from internal climate variability are observed at regional scales. For instance, upper temperature in the equatorial Pacific is controlled by ENSO (El Niño Southern Oscillation) variability from interannual to multidecadal timescales. Also, both the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO) modulate intermittently the interdecadal OHC variability in the North Pacific and Mid Atlantic, respectively. The NAO, through its influence on North Atlantic surface heat fluxes and convection, also plays an important role on the OHC at multiple timescales, leading first to a cooling in ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Unknown Pacific Climate of the Past 9 2 547 565 |
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English |
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envir geo |
spellingShingle |
envir geo P. Ortega M. Montoya F. González-Rouco H. Beltrami D. Swingedouw Variability of the ocean heat content during the last millennium – an assessment with the ECHO-g Model |
topic_facet |
envir geo |
description |
Studies addressing climate variability during the last millennium generally focus on variables with a direct influence on climate variability, like the fast thermal response to varying radiative forcing, or the large-scale changes in atmospheric dynamics (e.g. North Atlantic Oscillation). The ocean responds to these variations by slowly integrating in depth the upper heat flux changes, thus producing a delayed influence on ocean heat content (OHC) that can later impact low frequency SST (sea surface temperature) variability through reemergence processes. In this study, both the externally and internally driven variations of the OHC during the last millennium are investigated using a set of fully coupled simulations with the ECHO-G (coupled climate model ECHAMA4 and ocean model HOPE-G) atmosphere–ocean general circulation model (AOGCM). When compared to observations for the last 55 yr, the model tends to overestimate the global trends and underestimate the decadal OHC variability. Extending the analysis back to the last one thousand years, the main impact of the radiative forcing is an OHC increase at high latitudes, explained to some extent by a reduction in cloud cover and the subsequent increase of short-wave radiation at the surface. This OHC response is dominated by the effect of volcanism in the preindustrial era, and by the fast increase of GHGs during the last 150 yr. Likewise, salient impacts from internal climate variability are observed at regional scales. For instance, upper temperature in the equatorial Pacific is controlled by ENSO (El Niño Southern Oscillation) variability from interannual to multidecadal timescales. Also, both the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO) modulate intermittently the interdecadal OHC variability in the North Pacific and Mid Atlantic, respectively. The NAO, through its influence on North Atlantic surface heat fluxes and convection, also plays an important role on the OHC at multiple timescales, leading first to a cooling in ... |
format |
Article in Journal/Newspaper |
author |
P. Ortega M. Montoya F. González-Rouco H. Beltrami D. Swingedouw |
author_facet |
P. Ortega M. Montoya F. González-Rouco H. Beltrami D. Swingedouw |
author_sort |
P. Ortega |
title |
Variability of the ocean heat content during the last millennium – an assessment with the ECHO-g Model |
title_short |
Variability of the ocean heat content during the last millennium – an assessment with the ECHO-g Model |
title_full |
Variability of the ocean heat content during the last millennium – an assessment with the ECHO-g Model |
title_fullStr |
Variability of the ocean heat content during the last millennium – an assessment with the ECHO-g Model |
title_full_unstemmed |
Variability of the ocean heat content during the last millennium – an assessment with the ECHO-g Model |
title_sort |
variability of the ocean heat content during the last millennium – an assessment with the echo-g model |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/cp-9-547-2013 http://www.clim-past.net/9/547/2013/cp-9-547-2013.pdf https://doaj.org/article/2e428bf4980d4ff1b5a38b69a7668c9d |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Climate of the Past, Vol 9, Iss 2, Pp 547-565 (2013) |
op_relation |
doi:10.5194/cp-9-547-2013 1814-9324 1814-9332 http://www.clim-past.net/9/547/2013/cp-9-547-2013.pdf https://doaj.org/article/2e428bf4980d4ff1b5a38b69a7668c9d |
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undefined |
op_doi |
https://doi.org/10.5194/cp-9-547-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
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2 |
container_start_page |
547 |
op_container_end_page |
565 |
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