Difference between the North Atlantic and Pacific meridional overturning circulation in response to the uplift of the Tibetan Plateau
The role of the Tibetan Plateau (TP) in maintaining the large-scale overturning circulation in the Atlantic and Pacific is investigated using a coupled atmosphere–ocean model. For the present day with a realistic topography, model simulation shows a strong Atlantic meridional overturning circulation...
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fttriple:oai:gotriple.eu:66SXuSjKvRsoSAMzrzgKG 2023-05-15T17:31:03+02:00 Difference between the North Atlantic and Pacific meridional overturning circulation in response to the uplift of the Tibetan Plateau Su, Baohuang Jiang, Dabang Zhang, Ran Sepulchre, Pierre Ramstein, Gilles 2019-04-16 https://doi.org/10.5194/cp-14-751-2018 https://cp.copernicus.org/articles/14/751/2018/ en eng doi:10.5194/cp-14-751-2018 10670/1.m22jsd https://cp.copernicus.org/articles/14/751/2018/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2019 fttriple https://doi.org/10.5194/cp-14-751-2018 2023-01-22T17:54:43Z The role of the Tibetan Plateau (TP) in maintaining the large-scale overturning circulation in the Atlantic and Pacific is investigated using a coupled atmosphere–ocean model. For the present day with a realistic topography, model simulation shows a strong Atlantic meridional overturning circulation (AMOC) but a near absence of the Pacific meridional overturning circulation (PMOC), which are in good agreement with the present observations. In contrast, the simulation without the TP depicts a collapsed AMOC and a strong PMOC that dominates deep-water formation. The switch in deep-water formation between the two basins results from changes in the large-scale atmospheric circulation and atmosphere–ocean feedback over the Atlantic and Pacific. The intensified westerly winds and increased freshwater flux over the North Atlantic cause an initial slowdown of the AMOC, while the weakened East Asian monsoon circulation and associated decreased freshwater flux over the North Pacific give rise to the initial intensification of the PMOC. The further decreased heat flux and the associated increase in sea-ice fraction promote the final AMOC collapse over the Atlantic, while the further increased heat flux leads to the final PMOC establishment over the Pacific. Although the simulations were performed in a cold world, it still importantly implicates that the uplift of the TP alone could have been a potential driver for the reorganization of PMOC–AMOC between the late Eocene and early Oligocene. Text North Atlantic Sea ice Unknown Pacific Climate of the Past 14 6 751 762 |
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geo envir Su, Baohuang Jiang, Dabang Zhang, Ran Sepulchre, Pierre Ramstein, Gilles Difference between the North Atlantic and Pacific meridional overturning circulation in response to the uplift of the Tibetan Plateau |
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The role of the Tibetan Plateau (TP) in maintaining the large-scale overturning circulation in the Atlantic and Pacific is investigated using a coupled atmosphere–ocean model. For the present day with a realistic topography, model simulation shows a strong Atlantic meridional overturning circulation (AMOC) but a near absence of the Pacific meridional overturning circulation (PMOC), which are in good agreement with the present observations. In contrast, the simulation without the TP depicts a collapsed AMOC and a strong PMOC that dominates deep-water formation. The switch in deep-water formation between the two basins results from changes in the large-scale atmospheric circulation and atmosphere–ocean feedback over the Atlantic and Pacific. The intensified westerly winds and increased freshwater flux over the North Atlantic cause an initial slowdown of the AMOC, while the weakened East Asian monsoon circulation and associated decreased freshwater flux over the North Pacific give rise to the initial intensification of the PMOC. The further decreased heat flux and the associated increase in sea-ice fraction promote the final AMOC collapse over the Atlantic, while the further increased heat flux leads to the final PMOC establishment over the Pacific. Although the simulations were performed in a cold world, it still importantly implicates that the uplift of the TP alone could have been a potential driver for the reorganization of PMOC–AMOC between the late Eocene and early Oligocene. |
format |
Text |
author |
Su, Baohuang Jiang, Dabang Zhang, Ran Sepulchre, Pierre Ramstein, Gilles |
author_facet |
Su, Baohuang Jiang, Dabang Zhang, Ran Sepulchre, Pierre Ramstein, Gilles |
author_sort |
Su, Baohuang |
title |
Difference between the North Atlantic and Pacific meridional overturning circulation in response to the uplift of the Tibetan Plateau |
title_short |
Difference between the North Atlantic and Pacific meridional overturning circulation in response to the uplift of the Tibetan Plateau |
title_full |
Difference between the North Atlantic and Pacific meridional overturning circulation in response to the uplift of the Tibetan Plateau |
title_fullStr |
Difference between the North Atlantic and Pacific meridional overturning circulation in response to the uplift of the Tibetan Plateau |
title_full_unstemmed |
Difference between the North Atlantic and Pacific meridional overturning circulation in response to the uplift of the Tibetan Plateau |
title_sort |
difference between the north atlantic and pacific meridional overturning circulation in response to the uplift of the tibetan plateau |
publishDate |
2019 |
url |
https://doi.org/10.5194/cp-14-751-2018 https://cp.copernicus.org/articles/14/751/2018/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic Sea ice |
genre_facet |
North Atlantic Sea ice |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-14-751-2018 10670/1.m22jsd https://cp.copernicus.org/articles/14/751/2018/ |
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undefined |
op_doi |
https://doi.org/10.5194/cp-14-751-2018 |
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Climate of the Past |
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14 |
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6 |
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751 |
op_container_end_page |
762 |
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