Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula)
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...
Published in: | Estuarine, Coastal and Shelf Science |
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Centro Oceanográfico de A Coruña
2014
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Online Access: | http://hdl.handle.net/10508/7539 http://hdl.handle.net/10261/316280 https://doi.org/10.1016/j.ecss.2007.02.004 |
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ftcsic:oai:digital.csic.es:10261/316280 2024-02-11T10:06:48+01:00 Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula) Prego, R. (Ricardo) Guzmán-Zúñiga, D. Varela-Rodríguez, M. (Manuel) Castro, M. de Atlantic Ocean Central Atlantic Eastern Central Atlantic Northwest Spanish Lower Rias 2014-11-21T09:58:01Z http://hdl.handle.net/10508/7539 http://hdl.handle.net/10261/316280 https://doi.org/10.1016/j.ecss.2007.02.004 unknown Centro Oceanográfico de A Coruña https://www.sciencedirect.com/science/article/pii/S027277140700042X 0272-7714 http://hdl.handle.net/10508/7539 http://hdl.handle.net/10261/316280 doi:10.1016/j.ecss.2007.02.004 Estuarine Coastal and Shelf Science, 73. 2007: 409-422 900 none research article N 2014 ftcsic https://doi.org/10.1016/j.ecss.2007.02.004 2024-01-16T11:44:25Z 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 (2–4 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 μM of nitrate, 0.1 μM of phosphate and 1.5 μM 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 upwelling event (9.9 molDIN s−1). The ... 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 |
unknown |
description |
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 (2–4 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 μM of nitrate, 0.1 μM of phosphate and 1.5 μM 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 upwelling event (9.9 molDIN s−1). The ... |
format |
Article in Journal/Newspaper |
author |
Prego, R. (Ricardo) Guzmán-Zúñiga, D. Varela-Rodríguez, M. (Manuel) Castro, M. de |
spellingShingle |
Prego, R. (Ricardo) Guzmán-Zúñiga, D. Varela-Rodríguez, M. (Manuel) Castro, M. de Consequences of winter upwelling events on biogeochemical and phytoplankton patterns in a western Galician ria (NW Iberian peninsula) |
author_facet |
Prego, R. (Ricardo) Guzmán-Zúñiga, D. Varela-Rodríguez, M. (Manuel) Castro, M. de |
author_sort |
Prego, R. (Ricardo) |
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 |
Centro Oceanográfico de A Coruña |
publishDate |
2014 |
url |
http://hdl.handle.net/10508/7539 http://hdl.handle.net/10261/316280 https://doi.org/10.1016/j.ecss.2007.02.004 |
op_coverage |
Atlantic Ocean Central Atlantic Eastern Central Atlantic Northwest Spanish Lower Rias |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://www.sciencedirect.com/science/article/pii/S027277140700042X 0272-7714 http://hdl.handle.net/10508/7539 http://hdl.handle.net/10261/316280 doi:10.1016/j.ecss.2007.02.004 Estuarine Coastal and Shelf Science, 73. 2007: 409-422 900 |
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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1790604765146644480 |