Meridional Overturning Transports at 7.5 N and 24.5 N in the Atlantic Ocean during 1992-93 and 2010-11
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AuthorsHernández-Guerra, A. (Alonso); Pelegrí-Llopart, J.L. (José Luis); Fraile-Nuez, E. (Eugenio); Benítez-Barrios, V.M. (Verónica María); Emelianov, M. (Mikhail); Pérez-Hernández, M.D. (María Dolores); Vélez-Belchí, P. (Pedro)
Transatlantic hydrographic sections along latitudes 7.5N and 24.5N have been repeated with about 20 years difference, at the beginning of the 1990s and 2010s. For each period, an inverse model is applied to the closed box bound by both sections. The model imposes mass conservation for individual layers, defined by isoneutral surfaces, and the whole water column, using surface Ekman transport and several transport constraints for specific ranges of longitudes and depths. As a result, the velocities at the reference layer for each station pair and the dianeutral velocities between layers are estimated, and the horizontal velocity fields and the water, heat and freshwater transports are calculated; in particular, we find that mass transport per stratum at 24.5N in 2011 is in good agreement with the transport estimates from the RAPID-Watch array. During both realizations the dianeutral velocities downwell from the Upper North Atlantic Deep Water (UNADW) to the Lower North Atlantic Deep Water ...
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