Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity
Abstract The relationship between Atlantic multi‐decadal oscillation (AMO) and Atlantic meridional overturning circulation (AMOC) is examined with respect to two (inter‐ and multi‐decadal) different timescales using a long‐term unforced simulation of an earth system model of intermediate complexity....
Published in: | International Journal of Climatology |
---|---|
Main Authors: | , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2020
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/joc.6926 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6926 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6926 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6926 |
id |
crwiley:10.1002/joc.6926 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/joc.6926 2024-09-09T19:25:27+00:00 Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity Kim, Hyo‐Jeong An, Soon‐Il Kim, Daehyun National Research Foundation of Korea 2020 http://dx.doi.org/10.1002/joc.6926 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6926 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6926 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6926 en eng Wiley http://creativecommons.org/licenses/by/4.0/ International Journal of Climatology volume 41, issue S1 ISSN 0899-8418 1097-0088 journal-article 2020 crwiley https://doi.org/10.1002/joc.6926 2024-07-23T04:14:14Z Abstract The relationship between Atlantic multi‐decadal oscillation (AMO) and Atlantic meridional overturning circulation (AMOC) is examined with respect to two (inter‐ and multi‐decadal) different timescales using a long‐term unforced simulation of an earth system model of intermediate complexity. In the inter‐decadal timescale, the AMO and the AMOC establish a self‐sustaining oscillatory mode; the AMOC induces the positive AMO through meridional heat transport (MHT), but with the time delay of approximately 7 years as the AMOC anomalies propagate southward over time within the Atlantic basin. After then, the AMO reduces the density in the main sinking region and brings the negative phase of the AMOC, which results in the rest half of the cycle. On the other hand, in the multi‐decadal timescale, the AMO and the AMOC are almost in phase because the AMOC is spatially stationary, resulting in a pan‐Atlantic surface warming. In addition, the Arctic‐originated density fluctuations are required for the multi‐decadal AMOC to switch its phase. The results obtained in this study suggest that timescale dependency should be considered when investigating the AMOC–AMO relationship. Article in Journal/Newspaper Arctic Wiley Online Library Arctic International Journal of Climatology 41 S1 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract The relationship between Atlantic multi‐decadal oscillation (AMO) and Atlantic meridional overturning circulation (AMOC) is examined with respect to two (inter‐ and multi‐decadal) different timescales using a long‐term unforced simulation of an earth system model of intermediate complexity. In the inter‐decadal timescale, the AMO and the AMOC establish a self‐sustaining oscillatory mode; the AMOC induces the positive AMO through meridional heat transport (MHT), but with the time delay of approximately 7 years as the AMOC anomalies propagate southward over time within the Atlantic basin. After then, the AMO reduces the density in the main sinking region and brings the negative phase of the AMOC, which results in the rest half of the cycle. On the other hand, in the multi‐decadal timescale, the AMO and the AMOC are almost in phase because the AMOC is spatially stationary, resulting in a pan‐Atlantic surface warming. In addition, the Arctic‐originated density fluctuations are required for the multi‐decadal AMOC to switch its phase. The results obtained in this study suggest that timescale dependency should be considered when investigating the AMOC–AMO relationship. |
author2 |
National Research Foundation of Korea |
format |
Article in Journal/Newspaper |
author |
Kim, Hyo‐Jeong An, Soon‐Il Kim, Daehyun |
spellingShingle |
Kim, Hyo‐Jeong An, Soon‐Il Kim, Daehyun Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity |
author_facet |
Kim, Hyo‐Jeong An, Soon‐Il Kim, Daehyun |
author_sort |
Kim, Hyo‐Jeong |
title |
Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity |
title_short |
Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity |
title_full |
Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity |
title_fullStr |
Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity |
title_full_unstemmed |
Timescale‐dependent AMOC–AMO relationship in an earth system model of intermediate complexity |
title_sort |
timescale‐dependent amoc–amo relationship in an earth system model of intermediate complexity |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/joc.6926 https://onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6926 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/joc.6926 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.6926 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
International Journal of Climatology volume 41, issue S1 ISSN 0899-8418 1097-0088 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/joc.6926 |
container_title |
International Journal of Climatology |
container_volume |
41 |
container_issue |
S1 |
_version_ |
1809895249321918464 |