Fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation
CO2 and carbon cycle changes in the land, ocean and atmosphere are investigated using the comprehensive carbon cycle-climate model NCAR CSM1.4-carbon. Ensemble simulations are forced with freshwater perturbations applied at the North Atlantic and Southern Ocean deep water formation sites under pre-i...
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ftunivbern:oai:boris.unibe.ch:10130 2023-08-20T04:08:15+02:00 Fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation Bozbiyik, Anil Steinacher, Marco Joos, Fortunato Stocker, Thomas F. Menviel, Laurie 2011 application/pdf https://boris.unibe.ch/10130/1/cp-7-319-2011.pdf https://boris.unibe.ch/10130/ eng eng Copernicus Publications https://boris.unibe.ch/10130/ info:eu-repo/semantics/openAccess Bozbiyik, Anil; Steinacher, Marco; Joos, Fortunato; Stocker, Thomas F.; Menviel, Laurie (2011). Fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation. Climate of the past, 7(1), pp. 319-338. Göttingen: Copernicus Publications 10.5194/cp-7-319-2011 <http://dx.doi.org/10.5194/cp-7-319-2011> info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2011 ftunivbern https://doi.org/10.5194/cp-7-319-2011 2023-07-31T20:33:35Z CO2 and carbon cycle changes in the land, ocean and atmosphere are investigated using the comprehensive carbon cycle-climate model NCAR CSM1.4-carbon. Ensemble simulations are forced with freshwater perturbations applied at the North Atlantic and Southern Ocean deep water formation sites under pre-industrial climate conditions. As a result, the Atlantic Meridional Overturning Circulation reduces in each experiment to varying degrees. The physical climate fields show changes qualitatively in agreement with results documented in the literature, but there is a clear distinction between northern and southern perturbations. Changes in the physical variables, in turn, affect the land and ocean biogeochemical cycles and cause a reduction, or an increase, in the atmospheric CO2 concentration by up to 20 ppmv, depending on the location of the perturbation. In the case of a North Atlantic perturbation, the land biosphere reacts with a strong reduction in carbon stocks in some tropical locations and in high northern latitudes. In contrast, land carbon stocks tend to increase in response to a southern perturbation. The ocean is generally a sink of carbon although large reorganizations occur throughout various basins. The response of the land biosphere is strongest in the tropical regions due to a shift of the Intertropical Convergence Zone. The carbon fingerprints of this shift, either to the south or to the north depending on where the freshwater is applied, can be found most clearly in South America. For this reason, a compilation of various paleoclimate proxy records of Younger Dryas precipitation changes are compared with our model results. The proxy records, in general, show good agreement with the model's response to a North Atlantic freshwater perturbation. Article in Journal/Newspaper North Atlantic Southern Ocean BORIS (Bern Open Repository and Information System, University of Bern) Southern Ocean Climate of the Past 7 1 319 338 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
description |
CO2 and carbon cycle changes in the land, ocean and atmosphere are investigated using the comprehensive carbon cycle-climate model NCAR CSM1.4-carbon. Ensemble simulations are forced with freshwater perturbations applied at the North Atlantic and Southern Ocean deep water formation sites under pre-industrial climate conditions. As a result, the Atlantic Meridional Overturning Circulation reduces in each experiment to varying degrees. The physical climate fields show changes qualitatively in agreement with results documented in the literature, but there is a clear distinction between northern and southern perturbations. Changes in the physical variables, in turn, affect the land and ocean biogeochemical cycles and cause a reduction, or an increase, in the atmospheric CO2 concentration by up to 20 ppmv, depending on the location of the perturbation. In the case of a North Atlantic perturbation, the land biosphere reacts with a strong reduction in carbon stocks in some tropical locations and in high northern latitudes. In contrast, land carbon stocks tend to increase in response to a southern perturbation. The ocean is generally a sink of carbon although large reorganizations occur throughout various basins. The response of the land biosphere is strongest in the tropical regions due to a shift of the Intertropical Convergence Zone. The carbon fingerprints of this shift, either to the south or to the north depending on where the freshwater is applied, can be found most clearly in South America. For this reason, a compilation of various paleoclimate proxy records of Younger Dryas precipitation changes are compared with our model results. The proxy records, in general, show good agreement with the model's response to a North Atlantic freshwater perturbation. |
format |
Article in Journal/Newspaper |
author |
Bozbiyik, Anil Steinacher, Marco Joos, Fortunato Stocker, Thomas F. Menviel, Laurie |
spellingShingle |
Bozbiyik, Anil Steinacher, Marco Joos, Fortunato Stocker, Thomas F. Menviel, Laurie Fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation |
author_facet |
Bozbiyik, Anil Steinacher, Marco Joos, Fortunato Stocker, Thomas F. Menviel, Laurie |
author_sort |
Bozbiyik, Anil |
title |
Fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation |
title_short |
Fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation |
title_full |
Fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation |
title_fullStr |
Fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation |
title_full_unstemmed |
Fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation |
title_sort |
fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://boris.unibe.ch/10130/1/cp-7-319-2011.pdf https://boris.unibe.ch/10130/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Bozbiyik, Anil; Steinacher, Marco; Joos, Fortunato; Stocker, Thomas F.; Menviel, Laurie (2011). Fingerprints of changes in the terrestrial carbon cycle in response to large reorganizations in ocean circulation. Climate of the past, 7(1), pp. 319-338. Göttingen: Copernicus Publications 10.5194/cp-7-319-2011 <http://dx.doi.org/10.5194/cp-7-319-2011> |
op_relation |
https://boris.unibe.ch/10130/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-7-319-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
1 |
container_start_page |
319 |
op_container_end_page |
338 |
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1774720424260665344 |