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Timescale-dependent AMOC-AMO relationship in an earth system model of intermediate complexity

Authors
Kim, Hyo-JeongAn, Soon-IlKim, Daehyun
Issue Date
Jan-2021
Publisher
John Wiley & Sons Inc.
Citation
International Journal of Climatology, v.41, no.S1, pp.E3298 - E3306
Journal Title
International Journal of Climatology
Volume
41
Number
S1
Start Page
E3298
End Page
E3306
URI
https://yscholarhub.yonsei.ac.kr/handle/2021.sw.yonsei/5340
DOI
10.1002/joc.6926
ISSN
0899-8418
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.
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