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Increasing Atlantic Ocean heat transport in the latest generation coupled ocean-atmosphere models: The Role of Air-Sea Interaction

Increasing Atlantic Ocean heat transport in the latest generation coupled ocean-atmosphere models: The Role of Air-Sea Interaction
Increasing Atlantic Ocean heat transport in the latest generation coupled ocean-atmosphere models: The Role of Air-Sea Interaction
Recent increases in resolution of coupled ocean‐atmosphere models have the potential to improve the representation of poleward heat transport within the climate system. Here we examine the interplay between model resolution‐dependent changes in Atlantic Ocean heat transport (AOHT) and surface heat fluxes. The different roles of changes in atmospheric and ocean resolution are isolated using three different climate models (The Centro Euro‐Mediterraneo sui Cambiamenti Climatici Climate Model 2, Hadley Centre Global Environmental Model 3 – Global Coupled configuration 2, and European Community Earth‐System Model 3.1) and comparing runs in which (a) only the ocean resolution changes, (b) only the atmosphere resolution changes, and (c) both change. Enhancing ocean resolution from eddy parameterized to eddy permitting increases the AOHT throughout the basin, values changing from 1.0 to 1.2 PW at 26°N, bringing the AOHT into the range of estimates from the RAPID observing array. This increase in AOHT is associated with higher North Atlantic sea surface temperatures and increased ocean heat loss to the atmosphere. Increasing the atmospheric resolution alone has little impact on the AOHT due to regionally compensating changes in the components of the net heat flux. Finally, in a fourth experiment the impact of resolution changes in both components and the transition to an eddy‐resolving ocean is assessed. This additional resolution increase is accompanied by a further change in the AOHT and improves agreement with observations in the tropics but not the subpolar regions. However, unlike with the increase to the eddy‐permitting ocean, when the greatest AOHT change occurs in the subtropics and subpolar region, the most significant increase now occurs in the tropics.
2169-9275
8624-8637
Grist, Jeremy P.
ffea99af-f811-436f-9bac-5b02ba6dc00f
Josey, Simon A.
2252ab7f-5cd2-49fd-a951-aece44553d93
New, Adrian L.
69c2be8b-c6c2-408f-9612-6980b1a25802
Roberts, Malcolm
5577a257-2416-4760-b72a-711f3a2dee84
Koenigk, Torben
680e73f9-f6f2-4fc6-be0b-31a10eb1c107
Iovino, Doroteaciro
12e63e7b-13d9-450f-8283-80fc543a10f2
Grist, Jeremy P.
ffea99af-f811-436f-9bac-5b02ba6dc00f
Josey, Simon A.
2252ab7f-5cd2-49fd-a951-aece44553d93
New, Adrian L.
69c2be8b-c6c2-408f-9612-6980b1a25802
Roberts, Malcolm
5577a257-2416-4760-b72a-711f3a2dee84
Koenigk, Torben
680e73f9-f6f2-4fc6-be0b-31a10eb1c107
Iovino, Doroteaciro
12e63e7b-13d9-450f-8283-80fc543a10f2

Grist, Jeremy P., Josey, Simon A., New, Adrian L., Roberts, Malcolm, Koenigk, Torben and Iovino, Doroteaciro (2018) Increasing Atlantic Ocean heat transport in the latest generation coupled ocean-atmosphere models: The Role of Air-Sea Interaction. Journal of Geophysical Research: Oceans, 123 (11), 8624-8637. (doi:10.1029/2018JC014387).

Record type: Article

Abstract

Recent increases in resolution of coupled ocean‐atmosphere models have the potential to improve the representation of poleward heat transport within the climate system. Here we examine the interplay between model resolution‐dependent changes in Atlantic Ocean heat transport (AOHT) and surface heat fluxes. The different roles of changes in atmospheric and ocean resolution are isolated using three different climate models (The Centro Euro‐Mediterraneo sui Cambiamenti Climatici Climate Model 2, Hadley Centre Global Environmental Model 3 – Global Coupled configuration 2, and European Community Earth‐System Model 3.1) and comparing runs in which (a) only the ocean resolution changes, (b) only the atmosphere resolution changes, and (c) both change. Enhancing ocean resolution from eddy parameterized to eddy permitting increases the AOHT throughout the basin, values changing from 1.0 to 1.2 PW at 26°N, bringing the AOHT into the range of estimates from the RAPID observing array. This increase in AOHT is associated with higher North Atlantic sea surface temperatures and increased ocean heat loss to the atmosphere. Increasing the atmospheric resolution alone has little impact on the AOHT due to regionally compensating changes in the components of the net heat flux. Finally, in a fourth experiment the impact of resolution changes in both components and the transition to an eddy‐resolving ocean is assessed. This additional resolution increase is accompanied by a further change in the AOHT and improves agreement with observations in the tropics but not the subpolar regions. However, unlike with the increase to the eddy‐permitting ocean, when the greatest AOHT change occurs in the subtropics and subpolar region, the most significant increase now occurs in the tropics.

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Accepted/In Press date: 4 November 2018
e-pub ahead of print date: 8 November 2018
Published date: 27 November 2018

Identifiers

Local EPrints ID: 427402
URI: http://eprints.soton.ac.uk/id/eprint/427402
ISSN: 2169-9275
PURE UUID: 67ece020-c2fc-4e5f-b75a-ebf2a04084c3

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Date deposited: 15 Jan 2019 17:30
Last modified: 15 Mar 2024 23:43

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Contributors

Author: Jeremy P. Grist
Author: Simon A. Josey
Author: Adrian L. New
Author: Malcolm Roberts
Author: Torben Koenigk
Author: Doroteaciro Iovino

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