Evidence of upwelling events at the northern Patagonian shelf break
The Patagonian shelf break marks a transition between relative warm-fresh shelf waters and relative cold-salty Subantarctic Water advected northward by the Malvinas Current. From early spring to late autumn, the outer shelf region is characterized by a band of high chlorophyll concentration that sus...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_21699275_v120_n11_p7635_Valla |
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todo:paper_21699275_v120_n11_p7635_Valla2023-10-03T16:39:47Z Evidence of upwelling events at the northern Patagonian shelf break Valla, D. Piola, A.R. Malvinas Current ocean currents shelf break South Atlantic upwelling advection chlorophyll a cooling mixed layer mooring system nutrient cycling oceanic current phytoplankton satellite data sea surface temperature shelf break time series analysis transition zone trophic level upwelling water exchange water mass Atlantic Ocean Atlantic Ocean (South) Malvinas Current Patagonia The Patagonian shelf break marks a transition between relative warm-fresh shelf waters and relative cold-salty Subantarctic Water advected northward by the Malvinas Current. From early spring to late autumn, the outer shelf region is characterized by a band of high chlorophyll concentration that sustains higher trophic levels, including significant fisheries. We analyze time series of current and water mass property observations collected at two moorings deployed at the shelf edge at 41S and 43.8S to investigate what mechanisms lead to temperature variability at the shelf break, and their role on the nutrient supply to the upper layer. The in situ data are combined with satellite-derived observations of sea surface temperature and chlorophyll a to analyze a sharp cooling event at the outer shelf that lasted 10 days and extended 500 km along the outer shelf. The event is consistent with upwelling of cold waters through the base of the mixed layer. The vertical velocity required to explain the observed cooling is 13-29 m d -1 . Satellite-derived sea surface temperature reveals additional cooling events of similar characteristics. Seventy-five percent of these events are concurrent with surface chlorophyll increase over a 5 day period suggesting that cooling events observed at the shelf break are associated with nutrient fluxes that promote the growth of phytoplankton. © 2015. The Authors. Journal of Geophysical Research: Oceans published by Wiley Periodicals, Inc. on behalf of American Geophysical Union. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_21699275_v120_n11_p7635_Valla |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Malvinas Current ocean currents shelf break South Atlantic upwelling advection chlorophyll a cooling mixed layer mooring system nutrient cycling oceanic current phytoplankton satellite data sea surface temperature shelf break time series analysis transition zone trophic level upwelling water exchange water mass Atlantic Ocean Atlantic Ocean (South) Malvinas Current Patagonia |
| spellingShingle |
Malvinas Current ocean currents shelf break South Atlantic upwelling advection chlorophyll a cooling mixed layer mooring system nutrient cycling oceanic current phytoplankton satellite data sea surface temperature shelf break time series analysis transition zone trophic level upwelling water exchange water mass Atlantic Ocean Atlantic Ocean (South) Malvinas Current Patagonia Valla, D. Piola, A.R. Evidence of upwelling events at the northern Patagonian shelf break |
| topic_facet |
Malvinas Current ocean currents shelf break South Atlantic upwelling advection chlorophyll a cooling mixed layer mooring system nutrient cycling oceanic current phytoplankton satellite data sea surface temperature shelf break time series analysis transition zone trophic level upwelling water exchange water mass Atlantic Ocean Atlantic Ocean (South) Malvinas Current Patagonia |
| description |
The Patagonian shelf break marks a transition between relative warm-fresh shelf waters and relative cold-salty Subantarctic Water advected northward by the Malvinas Current. From early spring to late autumn, the outer shelf region is characterized by a band of high chlorophyll concentration that sustains higher trophic levels, including significant fisheries. We analyze time series of current and water mass property observations collected at two moorings deployed at the shelf edge at 41S and 43.8S to investigate what mechanisms lead to temperature variability at the shelf break, and their role on the nutrient supply to the upper layer. The in situ data are combined with satellite-derived observations of sea surface temperature and chlorophyll a to analyze a sharp cooling event at the outer shelf that lasted 10 days and extended 500 km along the outer shelf. The event is consistent with upwelling of cold waters through the base of the mixed layer. The vertical velocity required to explain the observed cooling is 13-29 m d -1 . Satellite-derived sea surface temperature reveals additional cooling events of similar characteristics. Seventy-five percent of these events are concurrent with surface chlorophyll increase over a 5 day period suggesting that cooling events observed at the shelf break are associated with nutrient fluxes that promote the growth of phytoplankton. © 2015. The Authors. Journal of Geophysical Research: Oceans published by Wiley Periodicals, Inc. on behalf of American Geophysical Union. |
| format |
JOUR |
| author |
Valla, D. Piola, A.R. |
| author_facet |
Valla, D. Piola, A.R. |
| author_sort |
Valla, D. |
| title |
Evidence of upwelling events at the northern Patagonian shelf break |
| title_short |
Evidence of upwelling events at the northern Patagonian shelf break |
| title_full |
Evidence of upwelling events at the northern Patagonian shelf break |
| title_fullStr |
Evidence of upwelling events at the northern Patagonian shelf break |
| title_full_unstemmed |
Evidence of upwelling events at the northern Patagonian shelf break |
| title_sort |
evidence of upwelling events at the northern patagonian shelf break |
| url |
http://hdl.handle.net/20.500.12110/paper_21699275_v120_n11_p7635_Valla |
| work_keys_str_mv |
AT vallad evidenceofupwellingeventsatthenorthernpatagonianshelfbreak AT piolaar evidenceofupwellingeventsatthenorthernpatagonianshelfbreak |
| _version_ |
1782028931966173184 |