Distribution of surface sediment properties along the Portuguese western margin
Organic matter contained in surface sediments from four regions on the western Portuguese shelf, which are influenced by coastal upwelling and fluvial input, was analysed with respect to elemental organic carbon (Corg) and nitrogen (Ntotal) content and isotopic carbon and nitrogen ratios (d13Corg, d...
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Format: | Dataset |
Language: | English |
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PANGAEA
2009
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.726597 https://doi.org/10.1594/PANGAEA.726597 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.726597 |
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openpolar |
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Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
819 Andromeda BC BCR Box corer Box corer (Reineck) BOXT01 BOXT14 BOXT21 BOXT23 BOXT25 Center for Marine Environmental Sciences D13882-5 D249 Discovery (1962) GeoB8903-1 Gravity corer (Kiel type) MARFLUX MARUM North Atlantic PALEO 1 PLUTUR6 PLUTUR6_BOXT01 PLUTUR6_BOXT14 PLUTUR6_BOXT21 PLUTUR6_BOXT23 PLUTUR6_BOXT25 Portuguese Margin POS287 POS287_01-1B POS287_04-1B POS287_05-1B POS287_06-1B POS287_08-1B POS287_09-1B POS287_10-1B POS287_11-2B POS287_12-1B POS287_13-1B POS287_14-1B POS287_15-1B POS287_16-1B POS287_17-1B POS287_18-1B POS287_19-1B POS287_20-2B POS287_21-1B POS287_22-1B POS287_26-1B POS287_27-1B |
spellingShingle |
819 Andromeda BC BCR Box corer Box corer (Reineck) BOXT01 BOXT14 BOXT21 BOXT23 BOXT25 Center for Marine Environmental Sciences D13882-5 D249 Discovery (1962) GeoB8903-1 Gravity corer (Kiel type) MARFLUX MARUM North Atlantic PALEO 1 PLUTUR6 PLUTUR6_BOXT01 PLUTUR6_BOXT14 PLUTUR6_BOXT21 PLUTUR6_BOXT23 PLUTUR6_BOXT25 Portuguese Margin POS287 POS287_01-1B POS287_04-1B POS287_05-1B POS287_06-1B POS287_08-1B POS287_09-1B POS287_10-1B POS287_11-2B POS287_12-1B POS287_13-1B POS287_14-1B POS287_15-1B POS287_16-1B POS287_17-1B POS287_18-1B POS287_19-1B POS287_20-2B POS287_21-1B POS287_22-1B POS287_26-1B POS287_27-1B Alt-Epping, Ulrich Mil-Homens, Mário Hebbeln, Dierk Abrantes, Fatima F Schneider, Ralph R Distribution of surface sediment properties along the Portuguese western margin |
topic_facet |
819 Andromeda BC BCR Box corer Box corer (Reineck) BOXT01 BOXT14 BOXT21 BOXT23 BOXT25 Center for Marine Environmental Sciences D13882-5 D249 Discovery (1962) GeoB8903-1 Gravity corer (Kiel type) MARFLUX MARUM North Atlantic PALEO 1 PLUTUR6 PLUTUR6_BOXT01 PLUTUR6_BOXT14 PLUTUR6_BOXT21 PLUTUR6_BOXT23 PLUTUR6_BOXT25 Portuguese Margin POS287 POS287_01-1B POS287_04-1B POS287_05-1B POS287_06-1B POS287_08-1B POS287_09-1B POS287_10-1B POS287_11-2B POS287_12-1B POS287_13-1B POS287_14-1B POS287_15-1B POS287_16-1B POS287_17-1B POS287_18-1B POS287_19-1B POS287_20-2B POS287_21-1B POS287_22-1B POS287_26-1B POS287_27-1B |
description |
Organic matter contained in surface sediments from four regions on the western Portuguese shelf, which are influenced by coastal upwelling and fluvial input, was analysed with respect to elemental organic carbon (Corg) and nitrogen (Ntotal) content and isotopic carbon and nitrogen ratios (d13Corg, d15N). Corg/Ntotal weight ratios and d13Corg values are interpreted in terms of terrigenous or marine organic matter sources, supported by CaCO3 content. Organic matter in the shelf sediments is mainly of marine origin, with increasing terrigenous components only close to rivers and estuaries. In the northern shelf region the data indicates significant terrigenous supply by the Douro River. North of the Nazaré Canyon organic matter composition implies a mainly marine origin, with a higher terrestrial influence close to the canyon head. Organic matter composition in the central shelf region, which is dominated by the Tagus Estuary and the Tagus prodelta, reveals a change from a continental-type signature within the estuary to a more marine-type signature further to the west and south of the estuary mouth. In the southern region near Cape Sines the geochemical properties clearly reflect the marine origin of sedimentary organic matter. Sedimentary d15N values are interpreted to reflect various degrees of assimilation of seasonally upwelled nitrate, in relation to the upwelling centres. In the estuarine environment, inputs of agriculturally influenced dissolved inorganic nitrogen are reflected in the sediments. No evidence for N2-fixation or denitrification is found. On the central shelf north of the Nazaré canyon, sedimentary d15N values are close to marine d15NO3- and thus indicate a complete NO3- assimilation and N-limitation of marine production. Light d15N values in distal sediments off the Douro River mouth and in samples south of C. Sines reflect high NO3- supply and a close proximity to the seasonal upwelling centres. Particularly in sediments form the Sines region, light d15N values in southern samples reflect ... |
format |
Dataset |
author |
Alt-Epping, Ulrich Mil-Homens, Mário Hebbeln, Dierk Abrantes, Fatima F Schneider, Ralph R |
author_facet |
Alt-Epping, Ulrich Mil-Homens, Mário Hebbeln, Dierk Abrantes, Fatima F Schneider, Ralph R |
author_sort |
Alt-Epping, Ulrich |
title |
Distribution of surface sediment properties along the Portuguese western margin |
title_short |
Distribution of surface sediment properties along the Portuguese western margin |
title_full |
Distribution of surface sediment properties along the Portuguese western margin |
title_fullStr |
Distribution of surface sediment properties along the Portuguese western margin |
title_full_unstemmed |
Distribution of surface sediment properties along the Portuguese western margin |
title_sort |
distribution of surface sediment properties along the portuguese western margin |
publisher |
PANGAEA |
publishDate |
2009 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.726597 https://doi.org/10.1594/PANGAEA.726597 |
op_coverage |
MEDIAN LATITUDE: 39.382546 * MEDIAN LONGITUDE: -9.154068 * SOUTH-BOUND LATITUDE: 37.638830 * WEST-BOUND LONGITUDE: -9.581700 * NORTH-BOUND LATITUDE: 41.383330 * EAST-BOUND LONGITUDE: -8.861000 * DATE/TIME START: 1992-12-03T16:35:00 * DATE/TIME END: 2003-10-15T10:24:00 |
long_lat |
ENVELOPE(-9.581700,-8.861000,41.383330,37.638830) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Alt-Epping, Ulrich; Mil-Homens, Mário; Hebbeln, Dierk; Abrantes, Fatima F; Schneider, Ralph R (2007): Provenance of organic matter and nutrient conditions on a river- and upwelling influenced shelf: A case study from the Portuguese Margin. Marine Geology, 243(1-4), 169-179, https://doi.org/10.1016/j.margeo.2007.04.016 |
op_relation |
Alt-Epping, Ulrich (2008): Late Quaternary sedimentation processes and sediment accumulation changes off Portugal. PhD Thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, urn:nbn:de:gbv:46-diss000111503 https://doi.pangaea.de/10.1594/PANGAEA.726597 https://doi.org/10.1594/PANGAEA.726597 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.726597 https://doi.org/10.1016/j.margeo.2007.04.016 |
_version_ |
1766137080331632640 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.726597 2023-05-15T17:37:16+02:00 Distribution of surface sediment properties along the Portuguese western margin Alt-Epping, Ulrich Mil-Homens, Mário Hebbeln, Dierk Abrantes, Fatima F Schneider, Ralph R MEDIAN LATITUDE: 39.382546 * MEDIAN LONGITUDE: -9.154068 * SOUTH-BOUND LATITUDE: 37.638830 * WEST-BOUND LONGITUDE: -9.581700 * NORTH-BOUND LATITUDE: 41.383330 * EAST-BOUND LONGITUDE: -8.861000 * DATE/TIME START: 1992-12-03T16:35:00 * DATE/TIME END: 2003-10-15T10:24:00 2009-08-19 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.726597 https://doi.org/10.1594/PANGAEA.726597 en eng PANGAEA Alt-Epping, Ulrich (2008): Late Quaternary sedimentation processes and sediment accumulation changes off Portugal. PhD Thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, urn:nbn:de:gbv:46-diss000111503 https://doi.pangaea.de/10.1594/PANGAEA.726597 https://doi.org/10.1594/PANGAEA.726597 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Alt-Epping, Ulrich; Mil-Homens, Mário; Hebbeln, Dierk; Abrantes, Fatima F; Schneider, Ralph R (2007): Provenance of organic matter and nutrient conditions on a river- and upwelling influenced shelf: A case study from the Portuguese Margin. Marine Geology, 243(1-4), 169-179, https://doi.org/10.1016/j.margeo.2007.04.016 819 Andromeda BC BCR Box corer Box corer (Reineck) BOXT01 BOXT14 BOXT21 BOXT23 BOXT25 Center for Marine Environmental Sciences D13882-5 D249 Discovery (1962) GeoB8903-1 Gravity corer (Kiel type) MARFLUX MARUM North Atlantic PALEO 1 PLUTUR6 PLUTUR6_BOXT01 PLUTUR6_BOXT14 PLUTUR6_BOXT21 PLUTUR6_BOXT23 PLUTUR6_BOXT25 Portuguese Margin POS287 POS287_01-1B POS287_04-1B POS287_05-1B POS287_06-1B POS287_08-1B POS287_09-1B POS287_10-1B POS287_11-2B POS287_12-1B POS287_13-1B POS287_14-1B POS287_15-1B POS287_16-1B POS287_17-1B POS287_18-1B POS287_19-1B POS287_20-2B POS287_21-1B POS287_22-1B POS287_26-1B POS287_27-1B Dataset 2009 ftpangaea https://doi.org/10.1594/PANGAEA.726597 https://doi.org/10.1016/j.margeo.2007.04.016 2023-01-20T07:31:28Z Organic matter contained in surface sediments from four regions on the western Portuguese shelf, which are influenced by coastal upwelling and fluvial input, was analysed with respect to elemental organic carbon (Corg) and nitrogen (Ntotal) content and isotopic carbon and nitrogen ratios (d13Corg, d15N). Corg/Ntotal weight ratios and d13Corg values are interpreted in terms of terrigenous or marine organic matter sources, supported by CaCO3 content. Organic matter in the shelf sediments is mainly of marine origin, with increasing terrigenous components only close to rivers and estuaries. In the northern shelf region the data indicates significant terrigenous supply by the Douro River. North of the Nazaré Canyon organic matter composition implies a mainly marine origin, with a higher terrestrial influence close to the canyon head. Organic matter composition in the central shelf region, which is dominated by the Tagus Estuary and the Tagus prodelta, reveals a change from a continental-type signature within the estuary to a more marine-type signature further to the west and south of the estuary mouth. In the southern region near Cape Sines the geochemical properties clearly reflect the marine origin of sedimentary organic matter. Sedimentary d15N values are interpreted to reflect various degrees of assimilation of seasonally upwelled nitrate, in relation to the upwelling centres. In the estuarine environment, inputs of agriculturally influenced dissolved inorganic nitrogen are reflected in the sediments. No evidence for N2-fixation or denitrification is found. On the central shelf north of the Nazaré canyon, sedimentary d15N values are close to marine d15NO3- and thus indicate a complete NO3- assimilation and N-limitation of marine production. Light d15N values in distal sediments off the Douro River mouth and in samples south of C. Sines reflect high NO3- supply and a close proximity to the seasonal upwelling centres. Particularly in sediments form the Sines region, light d15N values in southern samples reflect ... Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-9.581700,-8.861000,41.383330,37.638830) |