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  Relationship between the AMOC and multidecadal variability of the mid-latitude southern Indian Ocean

Zhang, R., Dong, B., Wen, Z., Guo, Y., Chen, X. (2023): Relationship between the AMOC and multidecadal variability of the mid-latitude southern Indian Ocean, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1203

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017424 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017424_1
Genre: Conference Paper

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 Creators:
Zhang, Ruijie1, Author
Dong, Buwen1, Author
Wen, Zhiping1, Author
Guo, Yuanyuan1, Author
Chen, Xiaodan1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Air–sea coupling system in the southwestern Indian Ocean (SWIO) exhibits predominant multidecadal variability that is the strongest during austral summer. It is characterized by an equivalent barotropic atmospheric high (low) pressure over warm (cold) sea surface temperature (SST) anomalies and a poleward (equatorward) shift of the westerlies. In this study, physical processes of this multidecadal variability are investigated by using observations/reanalysis and CMIP6 model simulations. Results suggest that the multidecadal fluctuation can be explained by the modulation of the Atlantic meridional overturning circulation (AMOC) and the local air–sea positive feedback in the SWIO. In both observation/reanalysis and CMIP6 model simulations, the AMOC presents a significant negative correlation with the multidecadal SST variation in the SWIO when the AMOC is leading by about a decade. The mechanisms are that the preceding AMOC variation can cause an interhemispheric dipolar pattern of SST anomalies in the Atlantic Ocean. Subsequently, the SST anomalies in the midlatitudes of the South Atlantic can propagate to the SWIO by the oceanic Rossby wave influenced by the Antarctic Circumpolar Current (ACC). Once the SST anomalies reach the SWIO, these SST anomalies in the oceanic front can affect the baroclinicity in the lower troposphere to influence the synoptic transient eddy and then intensify the atmospheric circulation anomaly via the eddy–mean flow interaction. Subsequently, the anomalous pressure over the SWIO can significantly strengthen the SST anomalies through modifying the surface heat flux and radiation as well as the oceanic meridional advection.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1203
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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