Year-long float trajectories in the Labrador Sea Water of the eastern North Atlantic Ocean |
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| Institution: | 1. IFREMER, Géosciences Marines, Plouzané 29280, France;2. UMR 6523 CNRS, IFREMER, IRD, UBO, Laboratoire d''Océanographie Physique et Spatiale, Plouzané 29280, France;3. IFREMER, Dynamiques des Ecosystèmes Côtiers, Plouzané 29280, France;4. UMR6538 CNRS-UBO, IUEM, Laboratoire Géosciences Océan, 29280 Plouzané, France;5. Dept. Earth Sciences, Royal Holloway Univ. London, Egham, Surrey TW20 0EX, United Kingdom;6. National Oceanography Centre, University of Southampton Waterfront Campus, European Way, Southampton SO14 3ZH, United Kingdom;1. School of Marine Sciences, Sun Yat-sen University, Zhuhai, Guangdong 519082, China;2. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, Guangdong 519000, China;3. Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou, Guangdong 510006, China;4. Institute of Coastal Systems - Analysis and Modeling, Helmholtz-Zentrum Hereon, 21502 Geesthacht, Germany;5. Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences (CUG), Wuhan 430074, China;1. Université de Bordeaux, UMR 5805 EPOC, Allée Geoffroy St Hilaire, 33615 Pessac cedex, France;2. TOTAL, CSTJF, Avenue Larribau, 64018 Pau cedex, France;1. Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK;2. ANCAP, Exploración y Producción, Paysandú s/n esq. Av. del Libertador, 11100 Montevideo, Uruguay |
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| Abstract: | Year-long Lagrangian trajectories within the Labrador Sea Water of the eastern North Atlantic Ocean are analysed for basic flow statistics. Root-mean-square velocities at 1750 m depth are about 2 cm/s, except within the North Atlantic Current, where they are twice as large. These values are consistent with previous Eulerian measurements and extend those results to a much larger domain of the eastern basin. Mean flow estimates in boxes large enough to contain about 1 float-year of data indicate that Labrador Sea Water, having crossed the Mid- Atlantic Ridge (not resolved) near 50–55°N, presumably with the North Atlantic Current, partially recirculates to the north in the subpolar gyre, as well as entering the subtropical gyre and continuing south and west. The circulation of this water mass, as defined by the 1 yr average velocities, is stronger than traditional models of deep circulation would suggest, with an interior flow of roughly 1 cm/s. Mean speeds up to 3 cm/s were observed, with the highest values near the Azores Plateau. North of 45°N–55°N, mean eastward speeds closer to 0.2 cm/s were observed. Wind-generated barotropic fluctuations may be responsible for some part of the transport at this depth. |
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