North Atlantic variability driven by stochastic forcing in a simple model
This study investigates the mechanisms driving North Atlantic (NA) variability using a simple model that incorporates the time evolution of interactive upper ocean temperature anomalies, horizontal (Gyre, Ψg) and vertical (meridional overturning circulation, Ψm) circulation. Th...
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2012
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Online Access: | https://doi.org/10.3402/tellusa.v64i0.18695 https://doaj.org/article/4b1776c5e39143c69a6a985427aeb307 |
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ftdoajarticles:oai:doaj.org/article:4b1776c5e39143c69a6a985427aeb307 2023-05-15T17:29:01+02:00 North Atlantic variability driven by stochastic forcing in a simple model Igor V. Polyakov Roman V. Bekryaev Xiangdong Zhang Uma S. Bhatt Rebecca Legatt 2012-06-01T00:00:00Z https://doi.org/10.3402/tellusa.v64i0.18695 https://doaj.org/article/4b1776c5e39143c69a6a985427aeb307 EN eng Stockholm University Press http://www.tellusa.net/index.php/tellusa/article/view/18695/pdf_2 https://doaj.org/toc/0280-6495 https://doaj.org/toc/1600-0870 doi:10.3402/tellusa.v64i0.18695 0280-6495 1600-0870 https://doaj.org/article/4b1776c5e39143c69a6a985427aeb307 Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 64, Iss 0, Pp 1-20 (2012) North Atlantic stochastic modelling variability Oceanography GC1-1581 Meteorology. Climatology QC851-999 article 2012 ftdoajarticles https://doi.org/10.3402/tellusa.v64i0.18695 2022-12-30T23:27:33Z This study investigates the mechanisms driving North Atlantic (NA) variability using a simple model that incorporates the time evolution of interactive upper ocean temperature anomalies, horizontal (Gyre, Ψg) and vertical (meridional overturning circulation, Ψm) circulation. The model is forced with multicentury long synthetic time series of external stochastic forcing that captures key statistical properties of observations such as the range of fluctuations and persistence of processes. The simulated oceanic response may be viewed as a delayed response to a cumulative atmospheric forcing over an interval defined by the system damping properties. Depending on the choice of parameters, the model suggests either compensatory mechanism (Ψm and Ψg are anti-correlated) or amplification mechanism (Ψm and Ψg are positively correlated). The compensatory mechanism implies that an increase of heat supplied by an anomalously strong Ψg would be balanced by a decrease of heat provided by a weaker Ψm and vice versa. The amplification mechanism suggests that both Ψm and Ψg maintain the heat budget in the system compensating its damping properties. Some evidence for these mechanisms is found in a global climate model. Further investigations of NA variability mechanisms are important as they improve understanding of how the NA climate system functions. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Tellus A: Dynamic Meteorology and Oceanography 64 1 18695 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
North Atlantic stochastic modelling variability Oceanography GC1-1581 Meteorology. Climatology QC851-999 |
spellingShingle |
North Atlantic stochastic modelling variability Oceanography GC1-1581 Meteorology. Climatology QC851-999 Igor V. Polyakov Roman V. Bekryaev Xiangdong Zhang Uma S. Bhatt Rebecca Legatt North Atlantic variability driven by stochastic forcing in a simple model |
topic_facet |
North Atlantic stochastic modelling variability Oceanography GC1-1581 Meteorology. Climatology QC851-999 |
description |
This study investigates the mechanisms driving North Atlantic (NA) variability using a simple model that incorporates the time evolution of interactive upper ocean temperature anomalies, horizontal (Gyre, Ψg) and vertical (meridional overturning circulation, Ψm) circulation. The model is forced with multicentury long synthetic time series of external stochastic forcing that captures key statistical properties of observations such as the range of fluctuations and persistence of processes. The simulated oceanic response may be viewed as a delayed response to a cumulative atmospheric forcing over an interval defined by the system damping properties. Depending on the choice of parameters, the model suggests either compensatory mechanism (Ψm and Ψg are anti-correlated) or amplification mechanism (Ψm and Ψg are positively correlated). The compensatory mechanism implies that an increase of heat supplied by an anomalously strong Ψg would be balanced by a decrease of heat provided by a weaker Ψm and vice versa. The amplification mechanism suggests that both Ψm and Ψg maintain the heat budget in the system compensating its damping properties. Some evidence for these mechanisms is found in a global climate model. Further investigations of NA variability mechanisms are important as they improve understanding of how the NA climate system functions. |
format |
Article in Journal/Newspaper |
author |
Igor V. Polyakov Roman V. Bekryaev Xiangdong Zhang Uma S. Bhatt Rebecca Legatt |
author_facet |
Igor V. Polyakov Roman V. Bekryaev Xiangdong Zhang Uma S. Bhatt Rebecca Legatt |
author_sort |
Igor V. Polyakov |
title |
North Atlantic variability driven by stochastic forcing in a simple model |
title_short |
North Atlantic variability driven by stochastic forcing in a simple model |
title_full |
North Atlantic variability driven by stochastic forcing in a simple model |
title_fullStr |
North Atlantic variability driven by stochastic forcing in a simple model |
title_full_unstemmed |
North Atlantic variability driven by stochastic forcing in a simple model |
title_sort |
north atlantic variability driven by stochastic forcing in a simple model |
publisher |
Stockholm University Press |
publishDate |
2012 |
url |
https://doi.org/10.3402/tellusa.v64i0.18695 https://doaj.org/article/4b1776c5e39143c69a6a985427aeb307 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 64, Iss 0, Pp 1-20 (2012) |
op_relation |
http://www.tellusa.net/index.php/tellusa/article/view/18695/pdf_2 https://doaj.org/toc/0280-6495 https://doaj.org/toc/1600-0870 doi:10.3402/tellusa.v64i0.18695 0280-6495 1600-0870 https://doaj.org/article/4b1776c5e39143c69a6a985427aeb307 |
op_doi |
https://doi.org/10.3402/tellusa.v64i0.18695 |
container_title |
Tellus A: Dynamic Meteorology and Oceanography |
container_volume |
64 |
container_issue |
1 |
container_start_page |
18695 |
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1766122321512235008 |