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Artículo

Twenty-five years of Mercator ocean reanalysis GLORYS12 at Drake Passage: Velocity assessment and total volume transport

Artana, Camila; Ferrari, RamiroIcon ; Bricaud, Clément; Lellouche, Jean-Michel; Garric, Gilles; Sennéchael, Nathalie; Lee, Jae-Hak; Park, Young-Hyang; Provost, Christine
Fecha de publicación: 12/2019
Editorial: Elsevier
Revista: Advances in Space Research
ISSN: 0273-1177
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Oceanografía, Hidrología, Recursos Hídricos

Resumen

Velocities in Drake Passage from the 25-year GLORYS12 Mercator Ocean reanalysis were compared with satellite altimetry-derived surface velocities and independent in-situ velocity measurements from the DRAKE (2006–2009) and cDrake (2007–2011) experiments. GLORYS12 assimilates satellite along-track sea level anomalies and, as expected, model velocities are in rather good agreement with gridded altimetry derived velocities (r ~ 0.5, above 99% confidence level). GLORYS12 velocities also compared well with the current-meter data from the DRAKE (in the water column) and cDrake (50 m above seafloor) experiments in terms of means and standard deviations; most correlations between the reanalysis and directly measured velocity time series were significant (r ~ 0.5 for DRAKE and r ~ 0.4 for cDrake, above 99% confidence level). We used the GLORYS12 reanalysis to examine the Antarctic Circumpolar Current (ACC) total volume transport across three sections in Drake Passage. The 25 years of the ACC total volume transport has a mean of 155 ± 3 Sv and a standard deviation of 6.7 Sv. Annual mean values span over a range of 12 Sv. The spectrum of the GLORYS12 total transport time series shows energy peaks (above 95% confidence level) at the intraseasonal, semi-annual and annual periods and no significant low-frequency variations (beyond 2 years) or trend, in agreement with previous studies. This first assessment of GLORYS12 velocities in Drake Passage is very encouraging for monitoring the regional variability of the ACC.
Palabras clave: ANTARCTIC CIRCUMPOLAR CURRENT , DRAKE PASSAGE , OCEAN REANALYSIS , SATELLITE ALTIMETRY , VOLUME TRANSPORT
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/123429
URL: https://linkinghub.elsevier.com/retrieve/pii/S0273117719308415
DOI: http://dx.doi.org/10.1016/j.asr.2019.11.033
Colecciones
Articulos(CIMA)
Articulos de CENTRO DE INVESTIGACIONES DEL MAR Y LA ATMOSFERA
Citación
Artana, Camila; Ferrari, Ramiro; Bricaud, Clément; Lellouche, Jean-Michel; Garric, Gilles; et al.; Twenty-five years of Mercator ocean reanalysis GLORYS12 at Drake Passage: Velocity assessment and total volume transport; Elsevier; Advances in Space Research; 12-2019; 1-20
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