The distribution and biochemical composition of biogenic particles across the subtropical Front in June 1993 (Azores-Madeira region, Northeast Atlantic)
Water samples were collected in the north-east Atlantic Ocean between the Azores and Madeira (33°N-36°N and 24°W-26°W) during the Oceanographic Cruise SEMAPHORE in June 1993. Temperature, salinity, nutrients (nitrate and phosphate) and particulate organic matter (organic carbon, organic nitrogen, ca...
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ftdoajarticles:oai:doaj.org/article:5a43c38b79d946c485bd885dfc970916 2023-05-15T17:36:56+02:00 The distribution and biochemical composition of biogenic particles across the subtropical Front in June 1993 (Azores-Madeira region, Northeast Atlantic) Luigi Vezzulli Paolo Povero Mauro Fabiano 2002-09-01T00:00:00Z https://doi.org/10.3989/scimar.2002.66n3205 https://doaj.org/article/5a43c38b79d946c485bd885dfc970916 EN eng Consejo Superior de Investigaciones Científicas http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/580 https://doaj.org/toc/0214-8358 https://doaj.org/toc/1886-8134 0214-8358 1886-8134 doi:10.3989/scimar.2002.66n3205 https://doaj.org/article/5a43c38b79d946c485bd885dfc970916 Scientia Marina, Vol 66, Iss 3, Pp 205-214 (2002) subtropical front particulate organic matter north atlantic ocean Aquaculture. Fisheries. Angling SH1-691 article 2002 ftdoajarticles https://doi.org/10.3989/scimar.2002.66n3205 2022-12-31T12:38:37Z Water samples were collected in the north-east Atlantic Ocean between the Azores and Madeira (33°N-36°N and 24°W-26°W) during the Oceanographic Cruise SEMAPHORE in June 1993. Temperature, salinity, nutrients (nitrate and phosphate) and particulate organic matter (organic carbon, organic nitrogen, carbohydrates, proteins and phytopigment) were investigated in the water column to a depth of 2000 m. The presence of the subtropical front (STF) separating warmer more saline Western Atlantic Water (WAW) from colder and fresher Eastern Atlantic Water (EAW) in the upper 100 m, and a tongue of salt water arising from the influence of Mediterranean Water (MW) at a depth of 1000 m, were well identified by the physical and chemical parameters. POC and PON concentrations, in the surface layer (0-100 m), ranged between 23.3-64.5 and 2.9-9.1 µg l-1 respectively, while concentration between 12.4-30.5 and 1.1-4.0 µg l-1 prevailed below the thermocline (100-2000 m). The very low POC and PON concentrations together with the low nutrient and chlorophyll-a concentrations confirmed the oligotrophic nature of the Azores-Madeira region. Statistical analysis was carried out to investigate the difference in the quantity and quality of POM between water masses. Regression analysis showed a high correlation between POC and PON but the slopes and intercepts of the regression lines did not differ significantly between WAW and EAW. In contrast, an examination of vertical profiles as well as mean integrated values of biochemical variables in the upper 100 m suggest a difference in the quantity and quality of biogenic particles between the water masses. WAW showed the lowest integrated concentrations of particulate organic carbon, particulate organic nitrogen, particulate protein and particulate carbohydrate. In contrast, frontal stations showed the highest values while EAW stations showed intermediate values. All these results, coupled with the occurrence of the highest POC:Chl-a ratio in EAW, suggest a temporal offset in the production cycle ... Article in Journal/Newspaper North Atlantic North East Atlantic Northeast Atlantic Directory of Open Access Journals: DOAJ Articles Scientia Marina 66 3 205 214 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
subtropical front particulate organic matter north atlantic ocean Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
subtropical front particulate organic matter north atlantic ocean Aquaculture. Fisheries. Angling SH1-691 Luigi Vezzulli Paolo Povero Mauro Fabiano The distribution and biochemical composition of biogenic particles across the subtropical Front in June 1993 (Azores-Madeira region, Northeast Atlantic) |
topic_facet |
subtropical front particulate organic matter north atlantic ocean Aquaculture. Fisheries. Angling SH1-691 |
description |
Water samples were collected in the north-east Atlantic Ocean between the Azores and Madeira (33°N-36°N and 24°W-26°W) during the Oceanographic Cruise SEMAPHORE in June 1993. Temperature, salinity, nutrients (nitrate and phosphate) and particulate organic matter (organic carbon, organic nitrogen, carbohydrates, proteins and phytopigment) were investigated in the water column to a depth of 2000 m. The presence of the subtropical front (STF) separating warmer more saline Western Atlantic Water (WAW) from colder and fresher Eastern Atlantic Water (EAW) in the upper 100 m, and a tongue of salt water arising from the influence of Mediterranean Water (MW) at a depth of 1000 m, were well identified by the physical and chemical parameters. POC and PON concentrations, in the surface layer (0-100 m), ranged between 23.3-64.5 and 2.9-9.1 µg l-1 respectively, while concentration between 12.4-30.5 and 1.1-4.0 µg l-1 prevailed below the thermocline (100-2000 m). The very low POC and PON concentrations together with the low nutrient and chlorophyll-a concentrations confirmed the oligotrophic nature of the Azores-Madeira region. Statistical analysis was carried out to investigate the difference in the quantity and quality of POM between water masses. Regression analysis showed a high correlation between POC and PON but the slopes and intercepts of the regression lines did not differ significantly between WAW and EAW. In contrast, an examination of vertical profiles as well as mean integrated values of biochemical variables in the upper 100 m suggest a difference in the quantity and quality of biogenic particles between the water masses. WAW showed the lowest integrated concentrations of particulate organic carbon, particulate organic nitrogen, particulate protein and particulate carbohydrate. In contrast, frontal stations showed the highest values while EAW stations showed intermediate values. All these results, coupled with the occurrence of the highest POC:Chl-a ratio in EAW, suggest a temporal offset in the production cycle ... |
format |
Article in Journal/Newspaper |
author |
Luigi Vezzulli Paolo Povero Mauro Fabiano |
author_facet |
Luigi Vezzulli Paolo Povero Mauro Fabiano |
author_sort |
Luigi Vezzulli |
title |
The distribution and biochemical composition of biogenic particles across the subtropical Front in June 1993 (Azores-Madeira region, Northeast Atlantic) |
title_short |
The distribution and biochemical composition of biogenic particles across the subtropical Front in June 1993 (Azores-Madeira region, Northeast Atlantic) |
title_full |
The distribution and biochemical composition of biogenic particles across the subtropical Front in June 1993 (Azores-Madeira region, Northeast Atlantic) |
title_fullStr |
The distribution and biochemical composition of biogenic particles across the subtropical Front in June 1993 (Azores-Madeira region, Northeast Atlantic) |
title_full_unstemmed |
The distribution and biochemical composition of biogenic particles across the subtropical Front in June 1993 (Azores-Madeira region, Northeast Atlantic) |
title_sort |
distribution and biochemical composition of biogenic particles across the subtropical front in june 1993 (azores-madeira region, northeast atlantic) |
publisher |
Consejo Superior de Investigaciones Científicas |
publishDate |
2002 |
url |
https://doi.org/10.3989/scimar.2002.66n3205 https://doaj.org/article/5a43c38b79d946c485bd885dfc970916 |
genre |
North Atlantic North East Atlantic Northeast Atlantic |
genre_facet |
North Atlantic North East Atlantic Northeast Atlantic |
op_source |
Scientia Marina, Vol 66, Iss 3, Pp 205-214 (2002) |
op_relation |
http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/580 https://doaj.org/toc/0214-8358 https://doaj.org/toc/1886-8134 0214-8358 1886-8134 doi:10.3989/scimar.2002.66n3205 https://doaj.org/article/5a43c38b79d946c485bd885dfc970916 |
op_doi |
https://doi.org/10.3989/scimar.2002.66n3205 |
container_title |
Scientia Marina |
container_volume |
66 |
container_issue |
3 |
container_start_page |
205 |
op_container_end_page |
214 |
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1766136593444241408 |