Ribeiro Sofia 0000-0003-0672-9161 Geological Survey of Denmark and Greenland GEUS https://ror.org/01b40r146 Gebara Livia livia.gebara@ipma.pt 0000-0002-1601-8825 Portuguese Institute of Sea and Atmosphere, Algés, Portugal IPMA Algarve Centre of Marine Sciences CCMAR https://www.ccmar.ualg.pt https://ror.org/00me37y22 Abrantes Fatima F fatima.abrantes@ipma.pt 0000-0002-9110-0212 Portuguese Institute of Sea and Atmosphere, Algés, Portugal IPMA Algarve Centre of Marine Sciences CCMAR https://www.ccmar.ualg.pt https://ror.org/00me37y22 2026 Biogenic silica of sediment core POS287_26-1B and POS287_26-3G dataset https://doi.org/10.1594/PANGAEA.991491 2026-03-20T10:20:49 The Iberian Margin, located in the mid-latitude North Atlantic at the western edge of the European continent, is a key region for climate and oceanographic research. The Portuguese western coast marks the northernmost boundary of the Canary Current upwelling system, experiencing seasonal wind-driven coastal upwelling from May to September. Eastern Boundary Upwelling Systems (EBUS) are among the most productive regions in the global ocean. They play a vital role in climate regulation and support both local and global fisheries. As part of the ICW3P project (PTDC/CTA-CLI/2884/2021) 'Impact of climate warming in the coastal upwelling system and primary production off Portugal: a study linking classical and emerging proxies', this study presents multi-proxy records from three inner-shelf sediment sequences. The project aimed to evaluate different nutrient sources and paleoceanographic features of the Iberian Margin and to reconstruct primary productivity and phytoplankton community variability over the past 1,000 years. This dataset presents biogenic silica (BSi) content from a sediment record collected west of the Tagus River mouth (POS-26B and -26G), in the central region of the Portuguese continental shelf, using box-core and gravity coring systems during the Poseidon cruise POS287 in 2002. Biogenic silica was measured at the Geological Survey of Denmark and Greenland using the weak base (Na2CO3) extraction method (DeMaster, 1991) and determined by spectrophotometry (blue ammonium-molybdate method, Mullin and Riley, 1955). Biogenic silica concentrations were calculated and corrected for mineral dissolution using the intercept of a linear regression, with the basic assumption that mineral-derived silica dissolves at a constant rate throughout the extraction whereas the biogenic silica dissolves within the first two hours (Barão et al., 2015). Abrantes Fátima Gomes S Salgado M Magalhães Vitor H vhm@ua.pt Salgueiro Emilia emilia.salgueiro@ipma.pt 0000-0003-1000-2977 Drago Teresa 0000-0003-3496-3270 Naughton Filipa filipa.naughton@ipma.pt 0000-0002-3055-9396 submitted Building a reliable Iberian margin chronology for the last millennium Oceans Abrantes Fatima F fatima.abrantes@ipma.pt 0000-0002-9110-0212 Rodrigues Teresa teresa.rodrigues@ipma.pt 0000-0001-7811-7506 Montanari B Santos C 0000-0002-4437-3218 Witt L Lopes Cristina cris.lopes@softhome.net 0000-0001-9884-5914 Voelker Antje H L antje.voelker@ipma.pt 0000-0001-6465-6023 2011 Climate of the last millennium at the southern pole of the North Atlantic Oscillation: an inner-shelf sediment record of flooding and upwelling journal article Climate Research 48(2-3) https://doi.org/10.3354/cr01010 261-280 Abrantes Fatima F fatima.abrantes@ipma.pt 0000-0002-9110-0212 Rodrigues Teresa teresa.rodrigues@ipma.pt 0000-0001-7811-7506 Rufino Marta M 0000-0002-0734-7491 Salgueiro Emilia emilia.salgueiro@ipma.pt 0000-0003-1000-2977 Oliveira Dulce dulce_oliveiraa@hotmail.com 0000-0002-3016-532X Gomes Sandra D 0000-0001-7807-3144 Oliveira Paulo B 0000-0001-6838-7377 Costa Ana Cristina accosta@uac.pt 0000-0003-2527-9979 Mil-Homens Mário mario.milhomens@ineti.pt 0000-0002-1570-2641 Drago Teresa 0000-0003-3496-3270 Naughton Filipa filipa.naughton@ipma.pt 0000-0002-3055-9396 2017 The climate of the Common Era off the Iberian Peninsula journal article Climate of the Past 13(12) https://doi.org/10.5194/cp-13-1901-2017 1901-1918 -9.3645 -9.364 38.55767 38.55817 -9.36425 38.557919999999996 2002-04-29T09:08:00 2002-04-29T10:08:00 0.005 2.068 vertical profile ICW3P Impact of climate warming in the coastal upwelling system and primary production off Portugal: a study linking classical and emergent proxies https://ccmar.ualg.pt/en/project/impact-climate-warming-coastal-upwelling-system-and-primary-production-portugal-study Fundação para a Ciência e Tecnologia FCT https://www.fct.pt/en/# https://doi.org/10.13039/501100001871 FCT/PTDC/CTA-CLI/2884/2021 Impact of climate warming in the coastal upwelling system and primary production off Portugal: a study linking classical and emergent proxies Fundação para a Ciência e Tecnologia FCT https://www.fct.pt/en/# https://doi.org/10.13039/501100001871 LA/ P/0101/2020 Fundação para a Ciência e Tecnologia FCT https://www.fct.pt/en/# https://doi.org/10.13039/501100001871 UID/PRR/04326/2025 POS287_26-1B 38.55817 -9.364 Portuguese Margin -96.0 2002-04-29T09:08:00 POS287 PALEO 1 2002-04-22T00:00:00 2002-05-03T00:00:00 Poseidon https://www2.bsh.de/aktdat/dod/fahrtplanung/Poseidon.htm DBKV 7427518 Monteiro, Jose doi:10.2312/cr_po287 Poseidon https://www2.bsh.de/aktdat/dod/fahrtplanung/Poseidon.htm DBKV 7427518 Box corer BC http://en.wikipedia.org/wiki/Box_corer unconsolidated sediment corers http://vocab.nerc.ac.uk/collection/L05/current/51/ 0.32 m Environment POS287_26-3G 38.55767 -9.3645 Portuguese Margin -97.0 2002-04-29T10:08:00 POS287 PALEO 1 2002-04-22T00:00:00 2002-05-03T00:00:00 Poseidon https://www2.bsh.de/aktdat/dod/fahrtplanung/Poseidon.htm DBKV 7427518 Monteiro, Jose doi:10.2312/cr_po287 Poseidon https://www2.bsh.de/aktdat/dod/fahrtplanung/Poseidon.htm DBKV 7427518 Gravity corer GC 3.05 m Environment 210 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Event label Event Ribeiro Sofia 0000-0003-0672-9161 Event Sample code/label Sample label Ribeiro Sofia 0000-0003-0672-9161 Sample label Latitude of event Latitude Ribeiro Sofia 0000-0003-0672-9161 Latitude Longitude of event Longitude Ribeiro Sofia 0000-0003-0672-9161 Longitude Elevation of event Elevation m Ribeiro Sofia 0000-0003-0672-9161 Elevation [m] Date/Time of event Date/Time Ribeiro Sofia 0000-0003-0672-9161 Date/Time Depth, sediment/rock, top/minimum Depth sed top m depth http://purl.obolibrary.org/obo/PATO_0001595 sediment http://purl.obolibrary.org/obo/ENVO_00002007 rock http://purl.obolibrary.org/obo/ENVO_00001995 minimum Length L http://dbpedia.org/resource/Length Ribeiro Sofia 0000-0003-0672-9161 Depth sed top [m] Depth, sediment/rock, bottom/maximum Depth sed bot m depth http://purl.obolibrary.org/obo/PATO_0001595 sediment http://purl.obolibrary.org/obo/ENVO_00002007 rock http://purl.obolibrary.org/obo/ENVO_00001995 maximum Length L http://dbpedia.org/resource/Length Ribeiro Sofia 0000-0003-0672-9161 Depth sed bot [m] DEPTH, sediment/rock Depth sed m depth http://purl.obolibrary.org/obo/PATO_0001595 sediment http://purl.obolibrary.org/obo/ENVO_00002007 rock Length L http://dbpedia.org/resource/Length Ribeiro Sofia 0000-0003-0672-9161 Depth sed [m] Biogenic silica, per unit sediment dry mass bSiO2/sed dm mg/g biogenic silica http://purl.obolibrary.org/obo/CHEBI_64389 see description in data abstract Ribeiro Sofia 0000-0003-0672-9161 bSiO2/sed dm [mg/g] Biogenic silica, per unit sediment dry mass, standard deviation bSiO2 std dev ± biogenic silica http://purl.obolibrary.org/obo/CHEBI_64389 standard deviation std dev https://en.wikipedia.org/wiki/Standard_deviation see description in data abstract Ribeiro Sofia 0000-0003-0672-9161 bSiO2 std dev [±] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels citable biogenic silica coastal upwelling Iberian margin Last millennium opal POS287-06 POS287-26 spectrophotometry author113724 author114188 author114242 author114243 author20396 author22402 author28897 author30675 author30929 author30931 author32202 author33996 author36371 author41848 author41849 author41850 author436 author48713 author51355 author55968 author63327 author785 award4481 award4586 award4819 basis11 campaign3397532 campaign34950 curlevel30 event2495899 event2631602 funder20899 geocode1 geocode1599 geocode1600 geocode1601 geocode8128 inst21482 inst21601 inst628 journal17076 journal3567 journal3569 license21 method10213 method10832 method11107 param518755 param518756 param554951 param554952 param790 pi33996 project5069 ref137376 ref36581 ref93381 term1073130 term1073131 term1073132 term1073209 term2299596 term26844 term37764 term38263 term38492 term41019 term41056 term43863 term47814 term48084 term50096 term51450 term54589 term77154 term77155 term77156 topotype3