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Schönfeld, Joachim; Zahn, Rainer; de Abreu, Lucia (2003): Stable isotope ratios and foraminiferal abundance of sediment cores from the Western Iberian Margin. PANGAEA, https://doi.org/10.1594/PANGAEA.733303, Supplement to: Schönfeld, J et al. (2003): Surface to deep water response to rapid climate changes at the western Iberian Margin. Global and Planetary Change, 36(4), 237-264, https://doi.org/10.1016/S0921-8181(02)00197-2

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Abstract:
Rapid climate changes at the onset of the last deglaciation and during Heinrich Event H4 were studied in detail at IMAGES cores MD95-2039 and MD95-2040 from the Western Iberian margin. A major reorganisation of surface water hydrography, benthic foraminiferal community structure, and deepwater isotopic composition commenced already 540 years before the Last Isotopic Maximum (LIM) at 17.43 cal. ka and within 670 years affected all environments. Changes were initiated by meltwater spill in the Nordic Seas and northern North Atlantic that commenced 100 years before concomitant changes were felt off western Iberia. Benthic foraminiferal associations record the drawdown of deepwater oxygenation during meltwater and subsequent Heinrich Events H1 and H4 with a bloom of dysoxic species. At a water depth of 3380 m, benthic oxygen isotopes depict the influence of brines from sea ice formation during ice-rafting pulses and meltwater spill. The brines conceivably were a source of ventilation and provided oxygen to the deeper water masses. Some if not most of the lower deep water came from the South Atlantic. Benthic foraminiferal assemblages display a multi-centennial, approximately 300-year periodicity of oxygen supply at 2470-m water depth. This pattern suggests a probable influence of atmospheric oscillations on the thermohaline convection with frequencies similar to Holocene climate variations. For Heinrich Events H1 and H4, response times of surface water properties off western Iberia to meltwater injection to the Nordic Seas were extremely short, in the range of a few decades only. The ensuing reduction of deepwater ventilation commenced within 500-600 years after the first onset of meltwater spill. These fast temporal responses lend credence to numerical simulations that indicate ocean-climate responses on similar and even faster time scales.
Keyword(s):
Western Iberian Margin
Project(s):
International Marine Global Change Study (IMAGES)
Coverage:
Median Latitude: 40.580430 * Median Longitude: -10.066360 * South-bound Latitude: 40.578500 * West-bound Longitude: -10.348500 * North-bound Latitude: 40.581833 * East-bound Longitude: -9.861167
Date/Time Start: 1995-07-07T00:00:00 * Date/Time End: 1995-07-07T00:00:00
Event(s):
MD95-2039 (MD952039) * Latitude: 40.578500 * Longitude: -10.348500 * Date/Time: 1995-07-07T00:00:00 * Elevation: -3381.0 m * Recovery: 36 m * Location: Porto Seamount * Campaign: MD101 (IMAGES I) * Basis: Marion Dufresne * Device: Calypso Corer (CALYPSO) * Comment: XXIV Sections
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 * Device: Calypso Corer (CALYPSO) * Comment: XXIV Sections, core bent; section IIb jamed in the bent part of the core, recuperated in 1/2 liner
Size:
19 datasets

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Datasets listed in this publication series

  1. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Abundance of Globobulimina affinis in sediment core MD95-2039. https://doi.org/10.1594/PANGAEA.82020
  2. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Abundance of Globobulimina affinis in sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.82053
  3. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Abundance of Neogloboquadrina pachyderma sinistral in sediment core MD95-2039. https://doi.org/10.1594/PANGAEA.82022
  4. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Abundance of Neogloboquadrina pachyderma sinistral in sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.82055
  5. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Abundance of Uvigerina pygmaea in sediment core MD95-2039. https://doi.org/10.1594/PANGAEA.82024
  6. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Abundance of Uvigerina pygmaea in sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.82057
  7. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Ice rafted debris of sediment core MD95-2039. https://doi.org/10.1594/PANGAEA.82021
  8. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Ice rafted debris of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.82380
  9. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Stable carbon isotope ratios of C. wuellerstorfi from sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.82051
  10. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Stable carbon isotope ratios of Cibicidoides wuellerstorfi in sediment core MD95-2039. https://doi.org/10.1594/PANGAEA.82018
  11. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Stable oxygen isotope ratios of Globigerina bulloides from sediment core MD95-2039. https://doi.org/10.1594/PANGAEA.82019
  12. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Fig. 2) Stable oxygen isotope ratios of Globigerina bulloides from sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.82361
  13. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Table 1) Age model of sediment core MD95-2039. https://doi.org/10.1594/PANGAEA.82025
  14. Schönfeld, J; Zahn, R; de Abreu, L (2003): (Table 2) Age model of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.82058
  15. Schönfeld, J; Zahn, R; de Abreu, L (2003): Bulk weight of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.59904
  16. Schönfeld, J; Zahn, R; de Abreu, L (2003): Ice rafted debris, dolomite and tephra of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.59905
  17. Schönfeld, J; Zahn, R; de Abreu, L (2003): Organic carbon of sediment core MD95-2039. https://doi.org/10.1594/PANGAEA.82023
  18. Schönfeld, J; Zahn, R; de Abreu, L (2003): Organic carbon of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.82056
  19. Schönfeld, J; Zahn, R; de Abreu, L (2003): Stable isotope ratios on benthic foraminifera of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.59933