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| Kurian, Jaison; Colas, Francois; Capet, Xavier; Mcwilliams, James C.; Chelton, Dudley B.. |
| Eddy detection and tracking algorithms are applied to both satellite altimetry and a high-resolution (dx = 5 km) climatological model solution of the U.S. West Coast to study the properties of surface and undercurrent eddies in the California Current System. Eddy properties show remarkable similarity in space and time, and even somewhat in polarity. Summer and fall are the most active seasons for undercurrent eddy generation, while there is less seasonal variation at surface. Most of the eddies have radii in the range of 25-100 km, sea level anomaly amplitudes of 1-4 cm, and vorticity normalized by f amplitudes of 0.025-0.2. Many of the eddies formed near the coast travel considerable distance westward with speeds about 2 km/day, consistent with the beta... |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00044/15484/12873.pdf |
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| Colas, Francois; Mcwilliams, James C.; Capet, Xavier; Kurian, Jaison. |
| The Peru-Chile current System (PCS) is a region of persistent biases in global climate models. It has strong coastal upwelling, alongshore boundary currents, and mesoscale eddies. These oceanic phenomena provide essential heat transport to maintain a cool oceanic surface underneath the prevalent atmospheric stratus cloud deck, through a combination of mean circulation and eddy flux. We demonstrate these behaviors in a regional, quasi-equilibrium oceanic model that adequately resolves the mesoscale eddies with climatological forcing. The key result is that the atmospheric heating is large (> 50 W m(-2)) over a substantial strip > 500 km wide off the coast of Peru, and the balancing lateral oceanic flux is much larger than provided by the offshore... |
| Tipo: Text |
Palavras-chave: Regional modelling; South-East Pacific; Heat Balance; Oceanic eddies; Regional climate. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00088/19892/17756.pdf |
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| Montes, Ivonne; Colas, Francois; Capet, Xavier; Schneider, Wolfgang. |
| The connections between the Equatorial Current System and the Peru Current System in the eastern tropical Pacific (ETP) are examined with a primitive equations eddy-resolving regional model. The quasi-equilibrium solutions reproduce three eastward equatorial subsurface currents of interest: the Equatorial Undercurrent (EUC, located between 1 degrees N and 1 degrees S), the primary Southern Subsurface Countercurrent (pSSCC, between 3 degrees and 4 degrees S) and, farther south the secondary Southern Subsurface Countercurrent (sSSCC, between 7 degrees and 8 degrees S). Using a Lagrangian tracking procedure, the fate of these currents in the ETP and their contribution to the Peru-Chile Undercurrent (PCUC) are studied. Lagrangian diagnostics show that for the... |
| Tipo: Text |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00013/12438/9249.pdf |
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| Garavelli, Lysel; Colas, Francois; Verley, Philippe; Kaplan, David Michael; Yannicelli, Beatriz; Lett, Christophe. |
| In marine benthic ecosystems, larval connectivity is a major process influencing the maintenance and distribution of invertebrate populations. Larval connectivity is a complex process to study as it is determined by several interacting factors. Here we use an individual-based, biophysical model, to disentangle the effects of such factors, namely larval vertical migration, larval growth, larval mortality, adults fecundity, and habitat availability, for the marine gastropod Concholepas concholepas (loco) in Chile. Lower transport success and higher dispersal distances are observed including larval vertical migration in the model. We find an overall decrease in larval transport success to settlement areas from northern to southern Chile. This spatial gradient... |
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| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00311/42254/74190.pdf |
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| Serpette, A; Le Cann, Bernard; Colas, Francois. |
| Between 1994 and 2001, several experiments (ARCANE, SEFOS, INTERAFOS) were conducted to directly measure the general and mesoscale Lagrangian circulations over the Bay of Biscay abyssal plain and slopes. Two levels (~100 m and ~450 m) were selected to cover the North Atlantic Central Water range. Two types of Lagrangian instruments, drogued surface drifters tracked by satellite (Surdrift) and acoustically tracked subsurface floats (Rafos and Marvor), were used. Overall, more than 36 instrument-years were collected in the Bay of Biscay region (43-49°N, 01-12°W). The weak general circulation in the Bay of Biscay is seen to be highly influenced by the occurrence of several mesoscale coherent features, notably slope currents and eddies, and these affect the... |
| Tipo: Text |
Palavras-chave: Slope ocean exchanges; Mesoscale eddies; Slope current; Lagrangian floats and surface drifters; Bay of Biscay. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-6435.pdf |
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