Physical and biological modeling in the Gulf Stream region: Part II. Physical and biological processes |
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| Affiliation: | 1. Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland;2. Graduate School for Health Sciences, University of Bern, Bern, Switzerland;3. Division of Paediatric Pulmonology, Children’s Hospital St Gallen, St Gallen, Switzerland;4. Department of Paediatric Pulmonology, University Children’s Hospital Basel, Basel, Switzerland;5. Division of Paediatric Pulmonology, University Children’s Hospital Zurich, Zurich, Switzerland;6. Department of Paediatrics, Kantonsspital Aarau, Aarau, Switzerland;7. Division of Paediatric Pulmonology, Children''s Hospital, Cantonal Hospital Lucerne, Lucerne, Switzerland;8. Division of Respiratory Medicine, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland;9. PedNet, University Children’s Hospital Bern, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland;1. Alaska Fisheries Science Center, National Marine Fisheries Service, 7600 Sand Point Way NE, Seattle, WA, 98115, USA;2. Lynker Technologies, LLC under contract to: Alaska Fisheries Science Center, National Marine Fisheries Service, 7600 Sand Point Way NE, Seattle, WA, 98115, USA;1. University of California, Berkeley, United States;2. Farallon Institute for Advanced Ecosystem Research, United States;3. NOAA, Southwest Fisheries Science Center, United States;1. Louisiana State University Health Sciences Center, New Orleans, LA;2. University of Colorado, Denver, CO;3. Vanderbilt University Medical Center, Nashville, TN;1. University of Massachusetts, Dartmouth, School for Marine Science and Technology, 200 Mill Rd., Suite 325, Fairhaven, MA 02719, USA;2. National Oceanography Centre, Southampton SO14 3ZH, UK |
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| Abstract: | Mesoscale physical and biological processes are examined at the Gulf Stream front by means of a 4-D simulation including physical and biological data assimilation. The data assimilated are from Leg 1 of the Fall BIOSYNOP cruise, 21 Sept.–8 Oct. 1988, and GULFCAST data for the same period. Focus is on the vertical velocities at the front, the vertical and horizontal transports of nutrients and plankton, and the impact of these transports on phytoplankton biomass, production and organic particle export. It was found that while jet meandering enhances new production at the front, primary production and phytoplankton concentration at the front are not significantly enhanced over those of Slope water. Winds during this period also have little impact on productivity at the front, due to their high temporal variability. Ring–stream interactions, however, significantly increase the net vertical and meridional transports of nutrients and plankton and can lead to phytoplankton patchiness at the front. This emphasizes the importance of submesoscale events between interacting mesoscale physical features in the transport of nutrients and plankton, and in explaining the observations. The enhanced phytoplankton concentrations observed during BIOSYNOP are found to be primarily due to advection (convergence) rather than in situ biological growth. |
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