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contributor authorGourcuff, Claire
contributor authorLherminier, Pascale
contributor authorMercier, Herlé
contributor authorLe Traon, Pierre Yves
date accessioned2017-06-09T16:40:56Z
date available2017-06-09T16:40:56Z
date copyright2011/10/01
date issued2011
identifier issn0739-0572
identifier otherams-72135.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4214105
description abstractmethod to estimate mass and heat transports across hydrographic sections using hydrography together with altimetry data in a geostrophic inverse box model is presented. Absolute surface velocities computed from Archiving, Validation, and Interpretation of Satellite Oceanographic data (AVISO) altimetry products made up of a combination of sea surface height measurements and geoid estimate are first compared to ship acoustic Doppler current profiler (S-ADCP) measurements of the Observatoire de la Variabilité Interannuelle et Décennale (OVIDE) project along hydrographic sections repeated every 2 yr in summer from Portugal to Greenland. The RMS difference between S-ADCP and altimetry velocities averaged on distances of about 100 km accounts for 3.3 cm s?1. Considering that the uncertainty of S-ADCP velocities is found at 1.5 cm s?1, altimetry errors are estimated at 3 cm s?1. Transports across OVIDE sections previously obtained using S-ADCP data to constrain the geostrophic inverse box model are used as a reference. The new method is found useful to estimate absolute transports across the sections, as well as part of their variability. Despite associated uncertainties that are about 50% larger than when S-ADCP is used, the results for the North Atlantic Current and heat transports, with uncertainties of 10%?15%, reproduce the already observed variability. The largest uncertainties are found in the estimates of the East Greenland Irminger Current (EGIC) transport (30%), induced by larger uncertainties associated with altimetry data at the western boundary.
publisherAmerican Meteorological Society
titleAltimetry Combined with Hydrography for Ocean Transport Estimation
typeJournal Paper
journal volume28
journal issue10
journal titleJournal of Atmospheric and Oceanic Technology
identifier doi10.1175/2011JTECHO818.1
journal fristpage1324
journal lastpage1337
treeJournal of Atmospheric and Oceanic Technology:;2011:;volume( 028 ):;issue: 010
contenttypeFulltext


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