Kinematic metrics of the Loop Current in the Gulf of Mexico from satellite altimetry |
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| Institution: | 1. ARTELIA Eau & Environnement, 6 rue de Lorraine, 38130 Echirolles, France;2. CEREMA/DTecEMF, 155 rue Pierre Bouguer, 29280 Plouzané, France;3. Université Pierre Mendes-France, Laboratoire Jean Kuntzmann, UMR 5224, BSHM, 1251 avenue centrale, BP 47, 38040 Grenoble Cedex 09, France;1. Dipartimento di Chimica “Ugo Schiff”, Università degli Studi di Firenze, via della Lastruccia 3-13, Sesto Fiorentino, FI, Italy;2. Consorzio Interuniversitario Reattività Chimica e Catalisi (CIRCC), via Celso Ulpiani 27, 70126 Bari, Italy;3. IENI-CNR and INSTM, Dipartimento di Scienze Chimiche, Università di Padova, Via Marzolo 1, 35131 Padova, Italy;4. Istituto di Chimica dei Composti OrganoMetallici (ICCOM) CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino, FI, Italy;5. Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca'' Foscari Venezia, via Torino 155, 30170 Venezia Mestre, Italy;6. SCSOP, Via Bornò 5, 23896 Sirtori, LC, Italy;1. AZTI-Tecnalia, Marine Research Division, Herrera kaia portualdea z/g, 20110 Pasaia, Spain;2. Instituto Mediterraneo de Estudios Avanzados, IMEDEA, (CSIC-UIB), Esporles, Spain;3. Laboratoire de Physique des Océans, UMR 6523 CNRS-Ifremer-IRD-UBO, Brest, France;4. CNRS, Université Pierre et Marie Curie (Paris 06), UMR 7159, Laboratoire d''Océanographie et de Climatologie: Expérimentations et Approches Numériques (LOCEAN), Paris, France;1. Instituto Nacional de Investigação Pesqueira, Av. Mao Tse Tung 309, Maputo, Mozambique;2. Department of Biological Sciences and Marine Research Institute, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa;3. Sorbonne Universités, UPMC Université Paris 06, IRD, Unité de Modélisation Mathématique et Informatique des Systèmes Complexes (UMMISCO), F-93143 Bondy, France;4. Ocean Science and Marine Food Security, Nelson Mandela University, Port Elizabeth, South Africa;5. National Oceanography Centre, European Way, Southampton, UK;6. ICEMASA, Department of Oceanography, University of Cape Town, South Africa;7. IRD, UMR 248 Marbec, Avenue Jean Monnet, 34203 Sete Cedex, France;8. Universités Brest, CNRS, IRD, Ifremer, Laboratoire d''Océanographie Physique et Spatiale, IUEM, Brest, France |
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| Abstract: | We analyzed a 20-year time series (January 1st, 1993 through December 31st, 2012) of Loop Current (LC) surface area derived from satellite altimetry in the eastern Gulf of Mexico to estimate kinematical metrics of this potent flow. On average the LC intrudes to its maximum northward position about 216 ± 126 days after the previous eddy separation; and ～30 ± 31 days later sheds a large anticyclonic eddy. When the northern extent of the LC intrusion following the previous eddy separation is greater than 27°N, the current retreats very quickly until it sheds another eddy with the entire separation process occurring on the order of 30 days. To first order the change in areal extent of the LC during intrusion into the Gulf occurs at an average rate of 225 km2 day?1, which corresponds to an intrusion velocity of 1.7 cm s?1 of the LC front, and adds Caribbean water to the Gulf at a rate of 2.6 ± 0.7 Sv. |
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| Keywords: | Kinematics Loop Current Satellite altimetry Area Vorticity Transport |
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