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Increasing the Atlantic subtropical jet cools the circum-North Atlantic region

Increasing the Atlantic subtropical jet cools the circum-North Atlantic region
Increasing the Atlantic subtropical jet cools the circum-North Atlantic region
The aim of this paper is to model part of a scenario for abrupt climate change over the North Atlantic sector in a General Circulation Model of intermediate complexity. Central to this scenario is the hypothesis that a substantial strengthening of the Atlantic subtropical jet will lead to a reorganization of the mid-latitude atmospheric circulation in which the Atlantic subtropical and eddy-driven jets coincide. The subtropical jet over the North Atlantic sector is increased by calculating optimal model tendency perturbations, using a recently developed technique. Strengthening of the subtropical jet is achieved by model tendency perturbations which (1) sharpen the meridional gradient in streamfunction or (2) force a strong and persistently negative North Atlantic Oscillation pattern in the upper troposphere. Both approaches lead to similar forcing patterns. It is found that when the subtropical jet is sufficiently strong, the eddy-driven jet is indeed drawn to the northern rim of the subtropical jet. This reduces atmospheric meridional heat transport over the North Atlantic. In the model, a positive feedback is observed; the southern sea ice-edge extends further south and snowcover over Europe is more persistent. All factors combined result in an overall cooling of the circum-North Atlantic region.
0941-2948
675-684
van der Schrier, Gerad
3c8ea2ef-9662-4aa8-a29a-4157729f4b99
Drijfhout, Sybren S.
a5c76079-179b-490c-93fe-fc0391aacf13
Hazeleger, Wilco
21d5b030-1127-424f-b22b-0a470dcb5b32
Noulin, Ludovic
8bf8eb9c-e338-43f6-8840-4c976eb15f0f
van der Schrier, Gerad
3c8ea2ef-9662-4aa8-a29a-4157729f4b99
Drijfhout, Sybren S.
a5c76079-179b-490c-93fe-fc0391aacf13
Hazeleger, Wilco
21d5b030-1127-424f-b22b-0a470dcb5b32
Noulin, Ludovic
8bf8eb9c-e338-43f6-8840-4c976eb15f0f

van der Schrier, Gerad, Drijfhout, Sybren S., Hazeleger, Wilco and Noulin, Ludovic (2007) Increasing the Atlantic subtropical jet cools the circum-North Atlantic region. Meteorologische Zeitschrift, 16 (6), 675-684. (doi:10.1127/0941-2948/2007/0252).

Record type: Article

Abstract

The aim of this paper is to model part of a scenario for abrupt climate change over the North Atlantic sector in a General Circulation Model of intermediate complexity. Central to this scenario is the hypothesis that a substantial strengthening of the Atlantic subtropical jet will lead to a reorganization of the mid-latitude atmospheric circulation in which the Atlantic subtropical and eddy-driven jets coincide. The subtropical jet over the North Atlantic sector is increased by calculating optimal model tendency perturbations, using a recently developed technique. Strengthening of the subtropical jet is achieved by model tendency perturbations which (1) sharpen the meridional gradient in streamfunction or (2) force a strong and persistently negative North Atlantic Oscillation pattern in the upper troposphere. Both approaches lead to similar forcing patterns. It is found that when the subtropical jet is sufficiently strong, the eddy-driven jet is indeed drawn to the northern rim of the subtropical jet. This reduces atmospheric meridional heat transport over the North Atlantic. In the model, a positive feedback is observed; the southern sea ice-edge extends further south and snowcover over Europe is more persistent. All factors combined result in an overall cooling of the circum-North Atlantic region.

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More information

Published date: December 2007
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 349152
URI: http://eprints.soton.ac.uk/id/eprint/349152
ISSN: 0941-2948
PURE UUID: bef28dda-4c6a-44b8-96f0-c47a33509d8e

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Date deposited: 26 Feb 2013 10:39
Last modified: 08 Jan 2022 09:07

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Contributors

Author: Gerad van der Schrier
Author: Wilco Hazeleger
Author: Ludovic Noulin

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