SATELLITE-DERIVED PHYTOPLANKTON PIGMENT STRUCTURES IN THE PORTUGUESE UPWELLING AREA
A series of 25 Nimbus 7 coastal zone color scanner images obtained from July 1981 to September 1983 in Portuguese coastal waters was analyzed in order to study the space-time distribution of phytoplankton pigment. In the images from winter and spring, the phytoplankton distributions showed no signif...
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ftunivnantes:oai:HAL:hal-03476510v1 2023-05-15T17:35:25+02:00 SATELLITE-DERIVED PHYTOPLANKTON PIGMENT STRUCTURES IN THE PORTUGUESE UPWELLING AREA Sousa, Fm Bricaud, A Laboratoire de Physique et Chimie Marines (LPCM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 1992 https://hal.science/hal-03476510 https://doi.org/10.1029/92JC00786 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1029/92JC00786 hal-03476510 https://hal.science/hal-03476510 doi:10.1029/92JC00786 JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS https://hal.science/hal-03476510 JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 1992, 97 (C7), pp.11343-11356. ⟨10.1029/92JC00786⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 1992 ftunivnantes https://doi.org/10.1029/92JC00786 2023-01-18T00:20:32Z A series of 25 Nimbus 7 coastal zone color scanner images obtained from July 1981 to September 1983 in Portuguese coastal waters was analyzed in order to study the space-time distribution of phytoplankton pigment. In the images from winter and spring, the phytoplankton distributions showed no significant spatial patterns. During the upwelling season, from late June to October, several recurrent patterns were observed. Filaments of high pigment concentration extended zonally 200 km off the west coast of Portugal, north of Lisbon. Pigment-rich plumes were observed south of capes along the west coast, south of Lisbon, and parallel to the south coast of Portugal. The location of the filaments and plumes coincided with topographic features such as submarine ridges. South of Lisbon the location of plumes was also related to coastal morphology. The temporal variability of the pigment patterns was compared with the wind-induced offshore Ekman transport calculated from measurements made at two meteorological stations, located at Lisbon and Faro, on the south coast. A significant relationship was found: well-developed phytoplankton structures were generally related to moderate or intense offshore transport, whereas the absence of plumes corresponded to either weak offshore transport or coastal convergence. For each of the three coastal areas in this study, scatter plots showed linear relationships between digital counts of phytoplankton concentration and sea surface temperature. The spatial variation of the temperature range decreased in time after the onset of an upwelling event. One cause of this variation could be the north-south change in temperature of the upwelled Eastern North Atlantic Central Water along the Portuguese coast. Article in Journal/Newspaper North Atlantic Université de Nantes: HAL-UNIV-NANTES Journal of Geophysical Research 97 C7 11343 11356 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Sousa, Fm Bricaud, A SATELLITE-DERIVED PHYTOPLANKTON PIGMENT STRUCTURES IN THE PORTUGUESE UPWELLING AREA |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
A series of 25 Nimbus 7 coastal zone color scanner images obtained from July 1981 to September 1983 in Portuguese coastal waters was analyzed in order to study the space-time distribution of phytoplankton pigment. In the images from winter and spring, the phytoplankton distributions showed no significant spatial patterns. During the upwelling season, from late June to October, several recurrent patterns were observed. Filaments of high pigment concentration extended zonally 200 km off the west coast of Portugal, north of Lisbon. Pigment-rich plumes were observed south of capes along the west coast, south of Lisbon, and parallel to the south coast of Portugal. The location of the filaments and plumes coincided with topographic features such as submarine ridges. South of Lisbon the location of plumes was also related to coastal morphology. The temporal variability of the pigment patterns was compared with the wind-induced offshore Ekman transport calculated from measurements made at two meteorological stations, located at Lisbon and Faro, on the south coast. A significant relationship was found: well-developed phytoplankton structures were generally related to moderate or intense offshore transport, whereas the absence of plumes corresponded to either weak offshore transport or coastal convergence. For each of the three coastal areas in this study, scatter plots showed linear relationships between digital counts of phytoplankton concentration and sea surface temperature. The spatial variation of the temperature range decreased in time after the onset of an upwelling event. One cause of this variation could be the north-south change in temperature of the upwelled Eastern North Atlantic Central Water along the Portuguese coast. |
author2 |
Laboratoire de Physique et Chimie Marines (LPCM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Sousa, Fm Bricaud, A |
author_facet |
Sousa, Fm Bricaud, A |
author_sort |
Sousa, Fm |
title |
SATELLITE-DERIVED PHYTOPLANKTON PIGMENT STRUCTURES IN THE PORTUGUESE UPWELLING AREA |
title_short |
SATELLITE-DERIVED PHYTOPLANKTON PIGMENT STRUCTURES IN THE PORTUGUESE UPWELLING AREA |
title_full |
SATELLITE-DERIVED PHYTOPLANKTON PIGMENT STRUCTURES IN THE PORTUGUESE UPWELLING AREA |
title_fullStr |
SATELLITE-DERIVED PHYTOPLANKTON PIGMENT STRUCTURES IN THE PORTUGUESE UPWELLING AREA |
title_full_unstemmed |
SATELLITE-DERIVED PHYTOPLANKTON PIGMENT STRUCTURES IN THE PORTUGUESE UPWELLING AREA |
title_sort |
satellite-derived phytoplankton pigment structures in the portuguese upwelling area |
publisher |
HAL CCSD |
publishDate |
1992 |
url |
https://hal.science/hal-03476510 https://doi.org/10.1029/92JC00786 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS https://hal.science/hal-03476510 JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 1992, 97 (C7), pp.11343-11356. ⟨10.1029/92JC00786⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/92JC00786 hal-03476510 https://hal.science/hal-03476510 doi:10.1029/92JC00786 |
op_doi |
https://doi.org/10.1029/92JC00786 |
container_title |
Journal of Geophysical Research |
container_volume |
97 |
container_issue |
C7 |
container_start_page |
11343 |
op_container_end_page |
11356 |
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1766134572836192256 |