A Comparison of Diagnostics for AMOC Heat Transport Applied to the CESM Large Ensemble
Abstract Atlantic time‐mean heat transport is northward at all latitudes and exhibits strong multidecadal variability between about 30°N and 55°N. Atlantic heat transport variability influences many aspects of the climate system, including regional surface temperatures, subpolar heat content, Arctic...
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American Geophysical Union (AGU)
2024
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ftdoajarticles:oai:doaj.org/article:b2195c2578d64b71894f376bb3a691c2 2024-09-30T14:31:34+00:00 A Comparison of Diagnostics for AMOC Heat Transport Applied to the CESM Large Ensemble C Spencer Jones Scout Jiang Ryan P. Abernathey 2024-08-01T00:00:00Z https://doi.org/10.1029/2023MS003978 https://doaj.org/article/b2195c2578d64b71894f376bb3a691c2 EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2023MS003978 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2023MS003978 https://doaj.org/article/b2195c2578d64b71894f376bb3a691c2 Journal of Advances in Modeling Earth Systems, Vol 16, Iss 8, Pp n/a-n/a (2024) ocean heat transport Atlantic meridional overturning circulation gyres Atlantic multidecadal variability Physical geography GB3-5030 Oceanography GC1-1581 article 2024 ftdoajarticles https://doi.org/10.1029/2023MS003978 2024-09-02T15:34:39Z Abstract Atlantic time‐mean heat transport is northward at all latitudes and exhibits strong multidecadal variability between about 30°N and 55°N. Atlantic heat transport variability influences many aspects of the climate system, including regional surface temperatures, subpolar heat content, Arctic sea‐ice concentration and tropical precipitation patterns. Atlantic heat transport and heat transport variability are commonly partitioned into two components: the heat transport by the Atlantic Meridional Overturning Circulation (AMOC) and the heat transport by the gyres. In this paper we compare four different methods for performing this partition, and we apply these methods to the Community Earth System Model Large Ensemble at 34°N, 26°N and 5°S. We discuss the strengths and weaknesses of each method. The four methods all give significantly different estimates for the proportion of the time‐mean heat transport performed by AMOC. One of these methods is a new physically‐motivated method based on the pathway of the northward‐flowing part of AMOC. This paper presents a preliminary version of our method that works only when the AMOC follows the western boundary of the basin. All the methods agree that at 26°N, 80%–100% of heat transport variability at 2–10 years timescales is performed by AMOC, but there is more disagreement between methods in attributing multidecadal variability, with some methods showing a compensation between the AMOC and gyre heat transport variability. Article in Journal/Newspaper Arctic Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Journal of Advances in Modeling Earth Systems 16 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ocean heat transport Atlantic meridional overturning circulation gyres Atlantic multidecadal variability Physical geography GB3-5030 Oceanography GC1-1581 |
spellingShingle |
ocean heat transport Atlantic meridional overturning circulation gyres Atlantic multidecadal variability Physical geography GB3-5030 Oceanography GC1-1581 C Spencer Jones Scout Jiang Ryan P. Abernathey A Comparison of Diagnostics for AMOC Heat Transport Applied to the CESM Large Ensemble |
topic_facet |
ocean heat transport Atlantic meridional overturning circulation gyres Atlantic multidecadal variability Physical geography GB3-5030 Oceanography GC1-1581 |
description |
Abstract Atlantic time‐mean heat transport is northward at all latitudes and exhibits strong multidecadal variability between about 30°N and 55°N. Atlantic heat transport variability influences many aspects of the climate system, including regional surface temperatures, subpolar heat content, Arctic sea‐ice concentration and tropical precipitation patterns. Atlantic heat transport and heat transport variability are commonly partitioned into two components: the heat transport by the Atlantic Meridional Overturning Circulation (AMOC) and the heat transport by the gyres. In this paper we compare four different methods for performing this partition, and we apply these methods to the Community Earth System Model Large Ensemble at 34°N, 26°N and 5°S. We discuss the strengths and weaknesses of each method. The four methods all give significantly different estimates for the proportion of the time‐mean heat transport performed by AMOC. One of these methods is a new physically‐motivated method based on the pathway of the northward‐flowing part of AMOC. This paper presents a preliminary version of our method that works only when the AMOC follows the western boundary of the basin. All the methods agree that at 26°N, 80%–100% of heat transport variability at 2–10 years timescales is performed by AMOC, but there is more disagreement between methods in attributing multidecadal variability, with some methods showing a compensation between the AMOC and gyre heat transport variability. |
format |
Article in Journal/Newspaper |
author |
C Spencer Jones Scout Jiang Ryan P. Abernathey |
author_facet |
C Spencer Jones Scout Jiang Ryan P. Abernathey |
author_sort |
C Spencer Jones |
title |
A Comparison of Diagnostics for AMOC Heat Transport Applied to the CESM Large Ensemble |
title_short |
A Comparison of Diagnostics for AMOC Heat Transport Applied to the CESM Large Ensemble |
title_full |
A Comparison of Diagnostics for AMOC Heat Transport Applied to the CESM Large Ensemble |
title_fullStr |
A Comparison of Diagnostics for AMOC Heat Transport Applied to the CESM Large Ensemble |
title_full_unstemmed |
A Comparison of Diagnostics for AMOC Heat Transport Applied to the CESM Large Ensemble |
title_sort |
comparison of diagnostics for amoc heat transport applied to the cesm large ensemble |
publisher |
American Geophysical Union (AGU) |
publishDate |
2024 |
url |
https://doi.org/10.1029/2023MS003978 https://doaj.org/article/b2195c2578d64b71894f376bb3a691c2 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_source |
Journal of Advances in Modeling Earth Systems, Vol 16, Iss 8, Pp n/a-n/a (2024) |
op_relation |
https://doi.org/10.1029/2023MS003978 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2023MS003978 https://doaj.org/article/b2195c2578d64b71894f376bb3a691c2 |
op_doi |
https://doi.org/10.1029/2023MS003978 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
16 |
container_issue |
8 |
_version_ |
1811636051045777408 |