Zonal Circulation in the North Atlantic Ocean at 52ºW from WOCE-WHP and CLIVAR sections: 1997, 2003 and 2012 ...

• Main Authors: Santana-Toscano, Daniel, Pérez-Hernández, M. Dolores, Macdonald, Alison, Arumí-Planas, Cristina, Caínzos, Verónica, Hernández-Guerra, Alonso
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: North Atlantic
• Online Access: https://dx.doi.org/10.57757/iugg23-2862; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019023

<!--!introduction!--> The A20 line is a meridional hydrographic section located at 52ºW that cuts through the western North Atlantic Subtropical Gyre (NASG). It encloses the main paths of the Atlantic Meridional Overturning Circulation (AMOC). Using data from three A20 hydrographic cruises carried out in 1997, 2003 and 2012 together with Acoustic Doppler Current Profiler data and the velocities from an inverse box model, the circulation of the western NASG is estimated. The Gulf Stream is the main poleward path of the AMOC, carrying 155.3±11.1, 102.7±13.5 and 181.1±14.9 Sv in 1997, 2003 and 2012, respectively (1 Sv = 10 6 m 3 /s ~ 10 9 kg/s). In opposite direction, the Deep Western Boundary Current crosses the section at the northern/southern boundaries with a mass transport of -21.2±8.9/29.0±9.1, -14.4±10.8/14.2±8.1 and -37.9±10.2/44.5±9.8 Sv in 1997, 2003 and 2012, respectively. A net heat exchange from the ocean to the atmosphere is estimated to be -0.7±0.1 PW and -0.6±0.1 PW in 1997 and 2012, ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...