Subpolar Gyre Index and the North Atlantic Meridional Overturning Circulation in a Coupled Climate Model

• Published in: Atmospheric and Oceanic Science Letters
• Main Authors: Gao, Yongqi, Yu, Lei
• Format: Article in Journal/Newspaper
• Language: English
• Published: Institute of Atmospheric Physics, Chinese Academy of Sciences 2008
• Subjects: North Atlantic meridional overturning circulation; Subpolar gyre index; VDP::Matematikk og Naturvitenskap: 400; Labrador Sea; North Atlantic
• Online Access: https://hdl.handle.net/1956/3302; https://doi.org/10.1080/16742834.2008.11446764

The subpolar gyre index (SPG), derived from the analysis of sea surface height (SSH), is proposed to be a potential indicator for the North Atlantic Meridional Overturning Circulation (AMOC) based on observation as well as the Ocean General Circulation Model (OGCM). We investigated the correspondence between the SPG and the AMOC in a coupled climate model. Our results confirm that the SPG can be used as an early indicator for the AMOC in the subtropical North Atlantic. Changes in the SPG are closely related to variations in the air-sea heat exchange in the Labrador Sea, and variations in deep water formation and southward dense water transport with the deep western boundary current (DWBC) in the North Atlantic.