Salgueiro, Emilia; Voelker, Antje H L; de Abreu, Lucia; Abrantes, Fatima F; Meggers, Helge; Wefer, Gerold (2010): Sea surface temperature and export productivity reconstructions of sediments off the western Iberian margin. PANGAEA, https://doi.org/10.1594/PANGAEA.743102, Supplement to: Salgueiro, E et al. (2010): Temperature and productivity changes off the western Iberian margin during the last 150 ky. Quaternary Science Reviews, 29(5-6), 680-695, https://doi.org/10.1016/j.quascirev.2009.11.013
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Present day hydrographic conditions along the western Iberian margin are characterized by seasonal upwelling with filaments that can penetrate more than 200 km into the open ocean and constitute areas of cold and highly productive waters. In order to investigate spatial and temporal gradients in temperature and productivity conditions during the last 150 ky, high-resolution proxy records were generated in 3 cores (SU92-03, MD95-2040, MD95-2042), located along the Iberian coast between 43°12'N and 37°48'N and forming a N-S profile. In all cores, planktonic foraminifera census counts are used to reconstruct summer sea surface temperature (SSTsu) and export productivity (Pexpsu) using the modern analog technique SIMMAX 28. SSTsu and Pexpsu values similar to the present are observed throughout the Holocene and MIS 5e periods for each site, respectively, indicating fairly stable conditions equivalent to the modern ones. On glacial/interglacial timescales, SSTsu increases by 2-3 °C from the northern to southernmost site. Pexpsu, on the other hand, shows a decrease of 30-40 gC/m**2/yr from North to South at present time and during interglacial periods, and no significant variation (90-100 gC/m**2/yr) during glacial periods. The northernmost core SU92-03 reveals the coldest conditions with records more similar to MD95-2040 than to MD95-2042, the later of which is, as at present, more affected by subtropical waters. Core SU92-03 shows higher interglacial productivity similar to open ocean mid- to high latitude sites, while the other two cores monitor higher glacial productivity conform with other upwelling sites off NW Africa. A boundary between differences in glacial/interglacial productivity appears to be present in our study between 43°12'N and 40°35'N. Especially north of 40°N, coldest SSTsu and lowest Pexpsu are found during Heinrich events (H)1-H8 and H10-H11. In contrast, lowest Pexpsu do not coincide with these events at site MD95-2042, but appear to be related to the presence of relatively warm and nutrient-poor subtropical Eastern North Atlantic Central Water advected with the Azores Current.
Median Latitude: 42.521520 * Median Longitude: -13.293860 * South-bound Latitude: 0.300000 * West-bound Longitude: -96.333000 * North-bound Latitude: 86.410000 * East-bound Longitude: 21.780000
Date/Time Start: 1995-07-07T00:00:00 * Date/Time End: 1995-07-09T00:00:00
MD95-2040 (MD952040) * Latitude: 40.581833 * Longitude: -9.861167 * Date/Time: 1995-07-07T00:00:00 * Elevation: -2465.0 m * Recovery: 35 m * Location: Porto Seamount * Campaign: MD101 (IMAGES I) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO) * Comment: XXIV Sections, core bent; section IIb jamed in the bent part of the core, recuperated in 1/2 liner
MD95-2042 (MD952042) * Latitude: 37.799833 * Longitude: -10.166500 * Date/Time: 1995-07-09T00:00:00 * Elevation: -3146.0 m * Recovery: 40 m * Location: Marge Ibérique * Campaign: MD101 (IMAGES I) * Basis: Marion Dufresne (1995) * Method/Device: Calypso Corer (CALYPSO) * Comment: XXVII Sections, OK; core bent
The modern analog file is based on the Iberian margin database (Salgueiro et al., 2008) combined with the North Atlantic surface samples used by the MARGO project (Kucera et al., 2005) and available upon request of the first author.
Datasets listed in this publication series
- Salgueiro, E; Voelker, AHL; de Abreu, L et al. (2010): (Figure 3c) Sea surface temperature reconstruction based on planktonic foraminifera sampled in surface sediments. https://doi.org/10.1594/PANGAEA.743089
- Salgueiro, E; Voelker, AHL; de Abreu, L et al. (2010): (Figure 3d) Export production reconstruction based on planktonic foraminiferal sampled in surface sediments. https://doi.org/10.1594/PANGAEA.743090
- Salgueiro, E; Voelker, AHL; de Abreu, L et al. (2010): (Table 2) Age determination of sediment core SU92-03. https://doi.org/10.1594/PANGAEA.743084
- Salgueiro, E; Voelker, AHL; de Abreu, L et al. (2010): Planktonic foraminiferal abundances, and sea surface and export production reconstructions of sediment core SU92-03. https://doi.org/10.1594/PANGAEA.743086
- Salgueiro, E; Voelker, AHL; de Abreu, L et al. (2010): Sea surface temperature and export production reconstructions of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.743087
- Salgueiro, E; Voelker, AHL; de Abreu, L et al. (2010): Sea surface temperature and export production reconstructions of sediment core MD95-2042. https://doi.org/10.1594/PANGAEA.743088
- Salgueiro, E; Voelker, AHL; de Abreu, L et al. (2010): Stable oxygen isotope record of planktonic and benthic foraminifera of sediment core SU92-03. https://doi.org/10.1594/PANGAEA.743085