Glider Observations of the Properties, Circulation and Formation of Water Masses on the Rockall Plateau in the North Atlantic.

The Overturning in Subpolar North Atlantic Program (OSNAP) is an international collaboration with the overarching goal of measuring the full-depth mass fluxes associated with the AMOC (Atlantic Meridional Overturning Circulation), as well as meridional heat and fresh-water fluxes. Through the deploy...

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Bibliographic Details
Main Authors: Houpert, Loic, Gary, Stefan, Inall, Mark, Johns, William, Porter, Marie, Dumont, Estelle, Cunningham, Stuart
Format: Conference Object
Language:English
Published: 2016
Subjects:
Oceanography
observations
gliders
climate
ocean circulation
North Atlantic
Rockall Plateau
Iceland
Online Access:https://pure.uhi.ac.uk/en/publications/877604e2-c1f5-49a0-a30f-c177aa80cdae
https://pureadmin.uhi.ac.uk/ws/files/1893748/OSM2016_poster_houpertv4.pdf
https://agu.confex.com/agu/os16/preliminaryview.cgi/Paper90977.html
Description
Summary:The Overturning in Subpolar North Atlantic Program (OSNAP) is an international collaboration with the overarching goal of measuring the full-depth mass fluxes associated with the AMOC (Atlantic Meridional Overturning Circulation), as well as meridional heat and fresh-water fluxes. Through the deployment of moorings and gliders, UK-OSNAP is part of this international partnership to maintain a transoceanic observing system in the subpolar north Atlantic (the OSNAP array). We present here the first year and a half of UK-OSNAP glider missions on the Rockall Plateau in the North Atlantic, along the section located at 58°N, between 22°W and 15°W. Between July 2014 and September 2015, 10 gliders sections were realized on the Rockall Plateau. The depth-averaged current estimated from gliders shows very strong values (up to 45cm.s-1) associated with meso-scale variability due particularly to eddies and water mass formation. Glider data also reveal a deep mixed layer in February/March 2015 up to 600m associated with the formation of the 27.3σθ and 27.4σθ Subpolar Mode Waters. The variability of the meridional transport of heat, salt and mass on the Rockall Plateau are also discussed. Relative and absolute geostrophic transports are calculated from the glider data and from the combination of the glider data and the data from mooring M4 located in the Iceland Basin (58°N, 21°W).

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