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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ftunivgenova:oai:iris.unige.it:11567/251616 2024-02-11T10:06:54+01:00 The distribution and biochemical composition of biogenic particles across the subtropical Front in June 1993 (Azores-Madeira region, Northeast Atlantic) VEZZULLI, LUIGI POVERO, PAOLO FABIANO, MAURO Vezzulli, Luigi Povero, Paolo Fabiano, Mauro 2002 STAMPA http://hdl.handle.net/11567/251616 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000178447900002 volume:66(3) firstpage:205 lastpage:214 journal:SCIENTIA MARINA http://hdl.handle.net/11567/251616 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0036750805 info:eu-repo/semantics/article 2002 ftunivgenova 2024-01-17T17:36:20Z 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 East Atlantic Northeast Atlantic Università degli Studi di Genova: CINECA IRIS |
institution |
Open Polar |
collection |
Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
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 ... |
author2 |
Vezzulli, Luigi Povero, Paolo Fabiano, Mauro |
format |
Article in Journal/Newspaper |
author |
VEZZULLI, LUIGI POVERO, PAOLO FABIANO, MAURO |
spellingShingle |
VEZZULLI, LUIGI POVERO, PAOLO FABIANO, MAURO The distribution and biochemical composition of biogenic particles across the subtropical Front in June 1993 (Azores-Madeira region, Northeast Atlantic) |
author_facet |
VEZZULLI, LUIGI POVERO, PAOLO FABIANO, MAURO |
author_sort |
VEZZULLI, LUIGI |
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) |
publishDate |
2002 |
url |
http://hdl.handle.net/11567/251616 |
genre |
North East Atlantic Northeast Atlantic |
genre_facet |
North East Atlantic Northeast Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000178447900002 volume:66(3) firstpage:205 lastpage:214 journal:SCIENTIA MARINA http://hdl.handle.net/11567/251616 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0036750805 |
_version_ |
1790604930487156736 |