The impacts of the atmospheric annular mode on the AMOC and its feedback in an idealized experiment

Autor(es)

Santis, Wlademir ^[1] ; Aimola, Luis ^[2] ; Campos, Edmo J. D. ^[1] ; Castellanos, Paola ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Oceanog Inst, Pca Oceanog 191, Cid Univ, BR-05508120 Sao Paulo, SP - Brazil

^[2] Gur Aryeh Inst Res & Educ, 485 Massachusetts Ave, Suite 300, Cambridge, MA - USA

^[3] CSIC, Inst Ciencies Mar, Dept Oceanog Fis & Tecnol, Barcelona - Spain

• Tipo de documento: Artigo Científico
• Fonte: DYNAMICS OF ATMOSPHERES AND OCEANS; v. 81, p. 30-41, MAR 2018.
• Citações Web of Science: 1

Resumo

The interdecadal variability of the atmospheric and oceanic meridional overturning circulation is studied, using a coupled model with two narrow meridional barriers representing the land and a flat bottomed Aquaplanet. Empirical orthogonal function (EOF) analysis are used in the atmospheric and oceanic meridional overturning cells, revealing the atmospheric interdecadal variability is dominated by an annular mode, in both hemispheres, which introduces in the ocean a set of patterns of variability. The most energetic EOFs in the ocean are the barotropic responses from the annular mode. The interaction between the heat anomalies, due to the barotropic response, and the thermohaline circulation of each basin leads to a resonance mechanism that feeds back to the atmospheric forcing, modulating the annular mode spectrum. Besides the barotropic response, the annular mode introduces anomalies of salinity and temperature in the subtropical Atlantic that affects its upper buoyancy. These anomalies are incorporated within the ocean circulation and advected until the areas of deep sinking in the northern Atlantic, impacting on its overturning circulation as well. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/50552-4 - Impacto do Atlântico Sul na célula de circulação meridional e no clima
• Beneficiário: Edmo José Dias Campos
• Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 10/01943-8 - Impactos de alterações no vazamento das agulhas sobre o Atlântico Sul (CALSA)
• Beneficiário: Edmo José Dias Campos
• Linha de fomento: Auxílio à Pesquisa - Regular