Article 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 reorgani...
Main Authors: | , , , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.161.6335 http://www.knmi.nl/publications/fulltexts/schrier_proof.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.161.6335 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.161.6335 2023-05-15T17:25:44+02:00 Article Increasing the Atlantic subtropical jet cools the circum-North Atlantic Region G. Van Der Schrier S. S. Drijfhout W. Hazeleger L. Noulin The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.161.6335 http://www.knmi.nl/publications/fulltexts/schrier_proof.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.161.6335 http://www.knmi.nl/publications/fulltexts/schrier_proof.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.knmi.nl/publications/fulltexts/schrier_proof.pdf text ftciteseerx 2016-01-07T15:44:51Z 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. Text North Atlantic North Atlantic oscillation Sea ice Unknown |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
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. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
G. Van Der Schrier S. S. Drijfhout W. Hazeleger L. Noulin |
spellingShingle |
G. Van Der Schrier S. S. Drijfhout W. Hazeleger L. Noulin Article Increasing the Atlantic subtropical jet cools the circum-North Atlantic Region |
author_facet |
G. Van Der Schrier S. S. Drijfhout W. Hazeleger L. Noulin |
author_sort |
G. Van |
title |
Article Increasing the Atlantic subtropical jet cools the circum-North Atlantic Region |
title_short |
Article Increasing the Atlantic subtropical jet cools the circum-North Atlantic Region |
title_full |
Article Increasing the Atlantic subtropical jet cools the circum-North Atlantic Region |
title_fullStr |
Article Increasing the Atlantic subtropical jet cools the circum-North Atlantic Region |
title_full_unstemmed |
Article Increasing the Atlantic subtropical jet cools the circum-North Atlantic Region |
title_sort |
article increasing the atlantic subtropical jet cools the circum-north atlantic region |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.161.6335 http://www.knmi.nl/publications/fulltexts/schrier_proof.pdf |
genre |
North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
North Atlantic North Atlantic oscillation Sea ice |
op_source |
http://www.knmi.nl/publications/fulltexts/schrier_proof.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.161.6335 http://www.knmi.nl/publications/fulltexts/schrier_proof.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766117214970183680 |