The onset of the Spring Bloom in the MEDOC area: mesoscale spatial variability |
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| Institution: | 1. College of Meteorology and Oceanology, National University of Defense Technology, Changsha, 410003, China;2. Instituto Dom Luíz, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Edifício C1, Piso 1, 1749-016, Lisboa, Portugal;3. Institute of Atmospheric Physics, Chinese Academy Sciences, Beijing, 100029, China;4. Bureau of Audit of Foshan Municipality, Foshan, 528000, China;1. Institute of Geosciences, Christian-Albrechts-University of Kiel, Kiel, Germany;2. WA-OIGC, Curtin University, Perth, Australia;1. State Key Laboratory of Marine Environment Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, Fujian Province 361102, China;2. Third Institute of Oceanography, State Oceanic Administration, Xiamen, Fujian Province 361005, China;3. Second Institute of Oceanography, State Oceanic Administration, Hangzhou, Zhejiang Province 310012, China;1. G.I. Marchuk Institute of Numerical Mathematics, RAS, 8, Gubkina st., Moscow, Russia;2. Moscow Institute of Physics and Technology, 9, Institutskiy per., Dolgoprudny, Moscow reg., Russia;3. Hydrometeorological center of Russia, 11-13, Bol. Predtechenskiy per., Moscow, Russia |
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| Abstract: | In the northwestern Mediterranean Sea, Coastal Zone Color Scanner images suggest that the eddies that participate in the restratification following deep convection interact with the spring phytoplankton bloom. The mechanisms for this interaction are studied using a biogeochemical model embedded in an eddy-resolving primitive equation ocean model. The model is initialized with a patch of dense water surrounded by a stratified ocean, which is characteristic of the winter situation. The atmospheric forcing is artificially held constant, in order to focus solely on the mesoscale variability. After a few days, meanders develop at the periphery of the patch, inducing its sinking and spreading. Mesoscale upward motions are responsible for the shoaling of the mixing layer in the trough of the meanders. As sunlight is the main factor regulating primary production at this time of year, this shoaling increases the mean exposure time of the phytoplankton cells and thus enhances productivity. Consequently, the majority of phytoplankton production is obtained at the edge of the patch, in agreement with in situ data. Through advection, phytoplankton is then subducted from these sources towards the crest of the meanders. Our results suggest that this mesoscale transport is responsible for a decorrelation between phytoplankton biomass and primary production. |
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