Drivers of North Atlantic Oscillation Events
This work is set out to quantify the contribution of tropical and extratropical atmospheric forcing mechanisms to the formation of the North Atlantic Oscillation (NAO) pattern. Although the NAO varies on a wide range of time scales, we focus on 10–60 d. At these time scales, mechanisms ar...
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ftdoajarticles:oai:doaj.org/article:e32a484398764b7484be1244e9487248 2023-05-15T17:28:44+02:00 Drivers of North Atlantic Oscillation Events Iris Manola Reindert J. Haarsma Wilco Hazeleger 2013-06-01T00:00:00Z https://doi.org/10.3402/tellusa.v65i0.19741 https://doaj.org/article/e32a484398764b7484be1244e9487248 EN eng Stockholm University Press http://www.tellusa.net/index.php/tellusa/article/download/19741/pdf_1 https://doaj.org/toc/0280-6495 https://doaj.org/toc/1600-0870 doi:10.3402/tellusa.v65i0.19741 0280-6495 1600-0870 https://doaj.org/article/e32a484398764b7484be1244e9487248 Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 65, Iss 0, Pp 1-13 (2013) North Atlantic Oscillation Rossby wave source eddy activity tropical forcing Oceanography GC1-1581 Meteorology. Climatology QC851-999 article 2013 ftdoajarticles https://doi.org/10.3402/tellusa.v65i0.19741 2022-12-31T02:13:30Z This work is set out to quantify the contribution of tropical and extratropical atmospheric forcing mechanisms to the formation of the North Atlantic Oscillation (NAO) pattern. Although the NAO varies on a wide range of time scales, we focus on 10–60 d. At these time scales, mechanisms are at play in the atmosphere that can generate the characteristic dipole pattern. We focus on the tropical Rossby Wave Source (RWS) and extratropical eddy activity. Anomalous tropical and extratropical vorticity forcing associated with the NAO is derived from atmospheric reanalysis data and applied in an idealised barotropic model. Also, using winds from composites of the NAO, the vorticity forcing is derived inversely from the barotropic vorticity equation. Both types of forcing are imposed in the barotropic model in the tropics and extratropics, respectively. An important result is that the tropics dampen the NAO as a result of a negative feedback generated in the extratropics. The damping is strongest, about 30%, for the negative phase of the NAO. For the positive phase, the damping is about 50% smaller. The results show that the barotropic vorticity equation can represent the dynamics of both tropical and extratropical forcing related to the formation of the NAO patterns. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Directory of Open Access Journals: DOAJ Articles Tellus A: Dynamic Meteorology and Oceanography 65 1 19741 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
North Atlantic Oscillation Rossby wave source eddy activity tropical forcing Oceanography GC1-1581 Meteorology. Climatology QC851-999 |
spellingShingle |
North Atlantic Oscillation Rossby wave source eddy activity tropical forcing Oceanography GC1-1581 Meteorology. Climatology QC851-999 Iris Manola Reindert J. Haarsma Wilco Hazeleger Drivers of North Atlantic Oscillation Events |
topic_facet |
North Atlantic Oscillation Rossby wave source eddy activity tropical forcing Oceanography GC1-1581 Meteorology. Climatology QC851-999 |
description |
This work is set out to quantify the contribution of tropical and extratropical atmospheric forcing mechanisms to the formation of the North Atlantic Oscillation (NAO) pattern. Although the NAO varies on a wide range of time scales, we focus on 10–60 d. At these time scales, mechanisms are at play in the atmosphere that can generate the characteristic dipole pattern. We focus on the tropical Rossby Wave Source (RWS) and extratropical eddy activity. Anomalous tropical and extratropical vorticity forcing associated with the NAO is derived from atmospheric reanalysis data and applied in an idealised barotropic model. Also, using winds from composites of the NAO, the vorticity forcing is derived inversely from the barotropic vorticity equation. Both types of forcing are imposed in the barotropic model in the tropics and extratropics, respectively. An important result is that the tropics dampen the NAO as a result of a negative feedback generated in the extratropics. The damping is strongest, about 30%, for the negative phase of the NAO. For the positive phase, the damping is about 50% smaller. The results show that the barotropic vorticity equation can represent the dynamics of both tropical and extratropical forcing related to the formation of the NAO patterns. |
format |
Article in Journal/Newspaper |
author |
Iris Manola Reindert J. Haarsma Wilco Hazeleger |
author_facet |
Iris Manola Reindert J. Haarsma Wilco Hazeleger |
author_sort |
Iris Manola |
title |
Drivers of North Atlantic Oscillation Events |
title_short |
Drivers of North Atlantic Oscillation Events |
title_full |
Drivers of North Atlantic Oscillation Events |
title_fullStr |
Drivers of North Atlantic Oscillation Events |
title_full_unstemmed |
Drivers of North Atlantic Oscillation Events |
title_sort |
drivers of north atlantic oscillation events |
publisher |
Stockholm University Press |
publishDate |
2013 |
url |
https://doi.org/10.3402/tellusa.v65i0.19741 https://doaj.org/article/e32a484398764b7484be1244e9487248 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 65, Iss 0, Pp 1-13 (2013) |
op_relation |
http://www.tellusa.net/index.php/tellusa/article/download/19741/pdf_1 https://doaj.org/toc/0280-6495 https://doaj.org/toc/1600-0870 doi:10.3402/tellusa.v65i0.19741 0280-6495 1600-0870 https://doaj.org/article/e32a484398764b7484be1244e9487248 |
op_doi |
https://doi.org/10.3402/tellusa.v65i0.19741 |
container_title |
Tellus A: Dynamic Meteorology and Oceanography |
container_volume |
65 |
container_issue |
1 |
container_start_page |
19741 |
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1766121586959581184 |