Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula)
14 páginas, 7 figuras, 3 tablas The consequences of two upwelling events in mid- (MW) and late (LW) winter on biogeochemical and phytoplankton patterns were studied in the Pontevedra Ria and compared with the patterns measured under typical winter conditions and under a summer upwelling event. Therm...
Published in: | Estuarine, Coastal and Shelf Science |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | http://hdl.handle.net/10261/55434 https://doi.org/10.1016/j.ecss.2007.02.004 |
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ftcsic:oai:digital.csic.es:10261/55434 2024-02-11T10:06:49+01:00 Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula) Prego, R. Guzmán-Zúñiga, Dafne Varela, Manuel Castro, M. de Gómez-Gesteira, M. 2007 http://hdl.handle.net/10261/55434 https://doi.org/10.1016/j.ecss.2007.02.004 en eng Elsevier http://dx.doi.org/10.1016/j.ecss.2007.02.004 Estuarine, Coastal and Shelf Science 73(3-4): 409-422 (2007) 0272-7714 http://hdl.handle.net/10261/55434 doi:10.1016/j.ecss.2007.02.004 none Upwelling Winter Biogeochemistry Phytoplankton Land-sea exchange LOICZ Ria NW Spain artículo http://purl.org/coar/resource_type/c_6501 2007 ftcsic https://doi.org/10.1016/j.ecss.2007.02.004 2024-01-16T09:40:23Z 14 páginas, 7 figuras, 3 tablas The consequences of two upwelling events in mid- (MW) and late (LW) winter on biogeochemical and phytoplankton patterns were studied in the Pontevedra Ria and compared with the patterns measured under typical winter conditions and under a summer upwelling event. Thermohaline patterns measured during the mid-winter upwelling event (MW-up) revealed the intrusion of saltier seawater (35.9) into the ria associated with the Iberian Poleward Current (IPC). During the late-winter upwelling event (LW-up), the seawater which had welled up into the ria showed characteristics of the Eastern North Atlantic Central Water mass (ENACW). In both cases the measured water residence time (4 days during MW-up and 10 days during LW-up) was related to both meteorological and fluvial forcing. This residence time contrasts with that of summer upwelling (7 days) and with that estimated under unfavorable upwelling atmospheric conditions (2e4 weeks). During MW-up, the ria became poor in nutrients due to continental freshwater dilution, associated with the shorter residence time of the water, and the intrusion of IPC, which is a water body poor in nutrient salts: 2.9 mM of nitrate, 0.1 mM of phosphate and 1.5 mM of silicate. During this event, the ria exported 3.4 molDIN s 1, compared with 6.9 molDIN s 1 in non-upwelling conditions. Phytoplankton showed a uniform distribution throughout the ria, as during unfavorable upwelling conditions, and was characterized by the dominance of diatoms, mainly Nitzschia longissima and Skeletonema costatum. During LW-up, a nutrient depletion in the photic layer also occurred, but as a result of a phytoplankton spring bloom developing at this time. The ria was a nutrient trap where 4.1 molDIN s 1 were processed by photosynthesis. This budget is three times higher than the one under non-upwelling conditions. In contrast with the MW-up, which had no effect on primary production, during LW-up the ria became more productive, although not as productive as during a summer ... Article in Journal/Newspaper North Atlantic Digital.CSIC (Spanish National Research Council) Estuarine, Coastal and Shelf Science 73 3-4 409 422 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Upwelling Winter Biogeochemistry Phytoplankton Land-sea exchange LOICZ Ria NW Spain |
spellingShingle |
Upwelling Winter Biogeochemistry Phytoplankton Land-sea exchange LOICZ Ria NW Spain Prego, R. Guzmán-Zúñiga, Dafne Varela, Manuel Castro, M. de Gómez-Gesteira, M. Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula) |
topic_facet |
Upwelling Winter Biogeochemistry Phytoplankton Land-sea exchange LOICZ Ria NW Spain |
description |
14 páginas, 7 figuras, 3 tablas The consequences of two upwelling events in mid- (MW) and late (LW) winter on biogeochemical and phytoplankton patterns were studied in the Pontevedra Ria and compared with the patterns measured under typical winter conditions and under a summer upwelling event. Thermohaline patterns measured during the mid-winter upwelling event (MW-up) revealed the intrusion of saltier seawater (35.9) into the ria associated with the Iberian Poleward Current (IPC). During the late-winter upwelling event (LW-up), the seawater which had welled up into the ria showed characteristics of the Eastern North Atlantic Central Water mass (ENACW). In both cases the measured water residence time (4 days during MW-up and 10 days during LW-up) was related to both meteorological and fluvial forcing. This residence time contrasts with that of summer upwelling (7 days) and with that estimated under unfavorable upwelling atmospheric conditions (2e4 weeks). During MW-up, the ria became poor in nutrients due to continental freshwater dilution, associated with the shorter residence time of the water, and the intrusion of IPC, which is a water body poor in nutrient salts: 2.9 mM of nitrate, 0.1 mM of phosphate and 1.5 mM of silicate. During this event, the ria exported 3.4 molDIN s 1, compared with 6.9 molDIN s 1 in non-upwelling conditions. Phytoplankton showed a uniform distribution throughout the ria, as during unfavorable upwelling conditions, and was characterized by the dominance of diatoms, mainly Nitzschia longissima and Skeletonema costatum. During LW-up, a nutrient depletion in the photic layer also occurred, but as a result of a phytoplankton spring bloom developing at this time. The ria was a nutrient trap where 4.1 molDIN s 1 were processed by photosynthesis. This budget is three times higher than the one under non-upwelling conditions. In contrast with the MW-up, which had no effect on primary production, during LW-up the ria became more productive, although not as productive as during a summer ... |
format |
Article in Journal/Newspaper |
author |
Prego, R. Guzmán-Zúñiga, Dafne Varela, Manuel Castro, M. de Gómez-Gesteira, M. |
author_facet |
Prego, R. Guzmán-Zúñiga, Dafne Varela, Manuel Castro, M. de Gómez-Gesteira, M. |
author_sort |
Prego, R. |
title |
Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula) |
title_short |
Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula) |
title_full |
Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula) |
title_fullStr |
Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula) |
title_full_unstemmed |
Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula) |
title_sort |
consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western galician ria (nw iberian peninsula) |
publisher |
Elsevier |
publishDate |
2007 |
url |
http://hdl.handle.net/10261/55434 https://doi.org/10.1016/j.ecss.2007.02.004 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://dx.doi.org/10.1016/j.ecss.2007.02.004 Estuarine, Coastal and Shelf Science 73(3-4): 409-422 (2007) 0272-7714 http://hdl.handle.net/10261/55434 doi:10.1016/j.ecss.2007.02.004 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.ecss.2007.02.004 |
container_title |
Estuarine, Coastal and Shelf Science |
container_volume |
73 |
container_issue |
3-4 |
container_start_page |
409 |
op_container_end_page |
422 |
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1790604809698541568 |