Hydrographic and Biological Survey of a Surface-Intensified Anticyclonic Eddy in the Caribbean Sea
| Autor: | Henk A. Dijkstra, C.G. van der Boog, Caroline A. Katsman, M. Scheidat, M.F. de Jong, Mardik F. Leopold, K. Schulz, Steve C.V. Geelhoed, Julie D. Pietrzak |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Isopycnal
010504 meteorology & atmospheric sciences Business Manager projecten Midden-Noord Tropical Atlantic Oceanography 01 natural sciences Caribbean Sea anticyclone Geophysics Water column Eddy barrier layer Space and Planetary Science Geochemistry and Petrology Anticyclone hydrographic Earth and Planetary Sciences (miscellaneous) Upwelling Thermohaline circulation ecology Hydrography Business Manager projects Mid-North thermohaline staircases 0105 earth and related environmental sciences |
| Zdroj: | Journal of Geophysical Research: Oceans 124 (2019) 8 Journal of Geophysical Research: Oceans, 124(8), 6235-6251 Journal Of Geophysical Research-Oceans, 124(8) |
| ISSN: | 2169-9275 |
| DOI: | 10.1029/2018jc014877 |
| Popis: | In the Caribbean Sea, mesoscale anticyclonic ocean eddies impact the local ecosystem by mixing of low salinity river outflow with the nutrient-rich waters upwelling along the Venezuelan and Colombian coast. To gain insight into the physics and the ecological impact of these anticyclones, we performed a combined hydrographic and biological survey of one Caribbean anticyclone in February 2018. We found that the anticyclone had a radius of 90 km and was surface intensified with the strongest velocities (0.72 m/s) in the upper 150 m of the water column. Below, isopycnal displacements were found down to 700 dbar. The core of the anticyclone entrained waters from the Orinoco River plume and contained slightly elevated chlorophyll concentrations compared to the surroundings. At the edge of the anticyclone we observed higher densities of flying fish but not higher densities of predators like seabirds and cetaceans. Below the surface, a strong temperature inversion (0.98 °C) was present within a barrier layer. In addition, we found thermohaline staircases that originated from double diffusion processes within Tropical Atlantic Central Water. |
| Databáze: | OpenAIRE |
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