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Abrantes, Fatima F; Lebreiro, Susana Martin; Rodrigues, Teresa; Gil, Isabelle M; Bartels-Jonsdottir, Helga B; Oliveira, Paulo; Kissel, Catherine; Grimalt, Joan O (2005): Sea surface temperature reconstruction on three sediment profiles off Portugal [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.761853, Supplement to: Abrantes, FF et al. (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

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Abstract:
Sea Surface Temperature (SST), river discharge and biological productivity have been reconstructed from a multi-proxy study of a high-temporal-resolution sedimentary sequence recovered from the Tagus deposition center off Lisbon (Portugal) for the last 2000 years. SST shows 2 °C variability on a century scale that allows the identification of the Medieval Warm Period (MWP) and the Little Ice Age (LIA).
High Iron (Fe) and fine-sediment deposition accompanied by high n-alkane concentrations and presence of freshwater diatoms during the LIA (1300-1900 AD) (Science 292 (2001) 662) suggest augmented river discharge, whereas higher total-alkenone concentrations point to increased river-induced productivity. During the MWP (550-1300 AD) (Science 292 (2001) 662) larger mean-grain size and low values of magnetic susceptibility, and concentrations of Fe, n-alkanes, and n-alcohols are interpreted to reflect decreased runoff. At the same time, increased benthic and planktonic foraminifera abundances and presence of upwelling related diatoms point to increased oceanic productivity. On the basis of the excellent match found between the negative phases of the North Atlantic Oscillation (NAO) index and the intensified Tagus River discharge observed for the last century, it is hypothesized that the increased influx of terrigenous material during the LIA reflects a negative NAO-like state or the occurrence of frequent extreme NAO minima. During the milder few centuries of the MWP, stronger coastal upwelling conditions are attributed to a persistent, positive NAO-like state or the frequent occurrence of extreme NAO maxima.
The peak in magnetic susceptibility, centered at 90 cm composite core depth (ccd), is interpreted as the result of the well-known 1755 AD Lisbon earthquake. The Lisbon earthquake and accompanying tsunami are estimated to have caused the loss of 39 cm of sediment (355 years of record-most of the LIA) and the instantaneous deposition of a 19-cm sediment bed.
Related to:
Rodrigues, Teresa; Grimalt, Joan O; Abrantes, Fatima F; Flores, José-Abel; Lebreiro, Susana Martin (2009): Holocene interdependences of changes in sea surface temperature, productivity, and fluvial inputs in the Iberian continental shelf (Tagus mud patch). Geochemistry, Geophysics, Geosystems, 10(7), Q07U06, https://doi.org/10.1029/2008GC002367
Coverage:
Median Latitude: 38.557460 * Median Longitude: -9.356000 * South-bound Latitude: 38.554000 * West-bound Longitude: -9.364500 * North-bound Latitude: 38.560000 * East-bound Longitude: -9.335500
Date/Time Start: 2000-09-01T00:00:00 * Date/Time End: 2002-04-29T10:08:00
Event(s):
D13902 * Latitude: 38.554000 * Longitude: -9.335500 * Date/Time: 2000-09-01T00:00:00 * Elevation: -90.0 m * Recovery: 6 m * Location: Portuguese Margin * Campaign: D249 * Basis: Discovery (1962) * Method/Device: Piston corer (PC)
POS287_26-1B * Latitude: 38.558170 * Longitude: -9.364000 * Date/Time: 2002-04-29T09:08:00 * Elevation: -96.0 m * Recovery: 0.32 m * Location: Portuguese Margin * Campaign: POS287 (PALEO 1) * Basis: Poseidon * Method/Device: Box corer (BC) * Comment: Environment
POS287_26-3G * Latitude: 38.557670 * Longitude: -9.364500 * Date/Time: 2002-04-29T10:08:00 * Elevation: -97.0 m * Recovery: 3.05 m * Location: Portuguese Margin * Campaign: POS287 (PALEO 1) * Basis: Poseidon * Method/Device: Gravity corer (GC) * Comment: Environment
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Abrantes, FF; Lebreiro, SM; Rodrigues, T et al. (2005): Sea surface temperature reconstruction from biomarker in sediment core D13902. https://doi.org/10.1594/PANGAEA.761852
  2. Abrantes, FF; Lebreiro, SM; Rodrigues, T et al. (2005): Grain size distribution of sediment cores POS287_26-1B, POS287_26-3G and D13902. https://doi.org/10.1594/PANGAEA.858954
  3. Abrantes, FF; Lebreiro, SM; Rodrigues, T et al. (2005): Sea surface temperature reconstruction from biomarker in sediment core POS287-26-1B. https://doi.org/10.1594/PANGAEA.761848
  4. Abrantes, FF; Lebreiro, SM; Rodrigues, T et al. (2005): Sea surface temperature reconstruction from biomarker in sediment core POS287-26-G. https://doi.org/10.1594/PANGAEA.761849