González-Martín, María; Rigual-Hernández, Andrés S; Abrantes, Fatima F; Gebara, Livia; Narciso, Aurea; Flores, José-Abel: Calcareous nannofossil assemblages and coccolith accumulation rates in sediment cores POS287_06-1B and POS287_06-2G from the Western Iberian Margin off Porto [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.987920 (dataset in review), In: González-Martín, M et al.: Calcareous nannofossil assemblages and coccolith accumulation rates in the Western Iberian Margin during the Common Era: sediment records from Porto, Lisbon, and Faro [dataset publication series]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.987996 (dataset in review)
Abstract:
This dataset contains quantitative records of calcareous nannofossil assemblages and coccolith accumulation rates from sediment cores collected along the western Iberian Margin (Porto, Lisbon, and Faro sites). The data cover the Common Era (~0–2000 years BP) and were produced to document high-resolution variations in primary productivity and surface ocean conditions under the influence of the Iberian upwelling system. Sediment cores were retrieved from the inner shelf at water depths of 80–96 m during the PALEO1 (R/V Poseidon, 2002) and POPEI0108 (NRP Auriga, 2008) oceanographic campaigns. In total, 166 sediment samples were analysed (71 from Porto, 37 from Lisbon, and 41 from Faro). Sample preparation followed the random settling technique of Flores and Sierro (1997), ensuring homogeneous coccolith distribution on slides. Calcareous nannofossils were identified and quantified under polarized-light microscopy at 1250× magnification. Absolute abundances (coccoliths/g) were calculated following Flores and Sierro (1997), and coccolith accumulation rates (NAR) were derived by combining coccolith concentration, dry bulk density, and sedimentation rates from published age models. The dataset includes absolute and relative abundances of coccolithophore taxa, total coccolith concentrations and NAR values. These data provide the basis for reconstructing primary productivity patterns and environmental variability along the western Iberian Margin during key climatic intervals of the Common Era, including the Medieval Climate Anomaly, Little Ice Age, and Industrial Era.
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Related to:
Abrantes, Fatima F; Lebreiro, Susana Martin; Rodrigues, Teresa; Gil, Isabelle M; Bartels-Jonsdottir, Helga B; Oliveira, Paulo; Kissel, Catherine; Grimalt, Joan O (2005): Shallow-marine sediment cores record climate variability and earthquake activity off Lisbon (Portugal) for the last 2000 years. Quaternary Science Reviews, 24, 2477-2494, https://doi.org/10.1016/j.quascirev.2004.04.009
Abrantes, Fatima F; Rodrigues, Teresa; Montanari, B; Santos, C; Witt, L; Lopes, Cristina; Voelker, Antje H L (2011): Climate of the last millennium at the southern pole of the North Atlantic Oscillation: an inner-shelf sediment record of flooding and upwelling. Climate Research, 48(2-3), 261-280, https://doi.org/10.3354/cr01010
Abrantes, Fatima F; Rodrigues, Teresa; Rufino, Marta M; Salgueiro, Emilia; Oliveira, Dulce; Gomes, Sandra D; Oliveira, Paulo; Costa, Ana Cristina; Mil-Homens, Mário; Drago, Teresa; Naughton, Filipa (2017): The climate of the Common Era off the Iberian Peninsula. Climate of the Past, 13(12), 1901-1918, https://doi.org/10.5194/cp-13-1901-2017
Flores, José Abel; Sierro, Francisco Javier (1997): Revised Technique for Calculation of Calcareous Nannofossil Accumulation Rates. Micropaleontology, 43(3), 321, https://doi.org/10.2307/1485832
Further details:
Funding:
Fundação para a Ciência e Tecnologia (FCT), grant/award no. PTDCCTA-CLI28842021: Impact of climate warming in the coastal upwelling system and primary production off Portugal: a study linking classical and emergent proxies
Coverage:
Latitude: 41.340000 * Longitude: -8.990000
Date/Time Start: 2002-04-25T10:23:00 * Date/Time End: 2002-04-25T11:30:00
Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 5.555 m
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Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
5396 data points
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