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Voelker, Antje H L; de Abreu, Lucia (2011): Aprubt climate change events in the Northeastern Atlantic Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.737449, Supplement to: Voelker, AHL; de Abreu, L (2011): A Review of Abrupt Climate Change Events in the Northeastern Atlantic Ocean (Iberian Margin): Latitudinal, Longitudinal and Vertical Gradients. In: Rashid, H; Polyak, L; Mosley-Thompson, E (eds.), Abrupt Climate Change: Mechanisms, Patterns, and Impacts. Geophysical Monograph Series (AGU, Washington D.C.), 193, 15-37, https://doi.org/10.1029/2010GM001021

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Abstract:
The western Iberian margin has been one of the key locations to study abrupt glacial climate change and associated interhemispheric linkages. The regional variability in the response to those events is being studied by combining a multitude of published and new records. Looking at the trend from Marine Isotope Stage (MIS) 10 to 2, the planktic foraminifer data, conform with the alkenone record of Martrat et al. [2007], shows that abrupt climate change events, especially the Heinrich events, became more frequent and their impacts in general stronger during the last glacial cycle. However, there were two older periods with strong impacts on the Atlantic meridional overturning circulation (AMOC): the Heinrich-type event associated with Termination (T) IV and the one occurring during MIS 8 (269 to 265 ka). During the Heinrich stadials of the last glacial cycle, the polar front reached the northern Iberian margin (ca. 41°N), while the arctic front was located in the vicinity of 39°N. During all the glacial periods studied, there existed a boundary at the latter latitude, either the arctic front during extreme cold events or the subarctic front during less strong coolings or warmer glacials. Along with these fronts sea surface temperatures (SST) increased southward by about 1°C per one degree of latitude leading to steep temperature gradients in the eastern North Atlantic and pointing to a close vicinity between subpolar and subtropical waters. The southern Iberian margin was always bathed by subtropical water masses - surface and/ or subsurface ones -, but there were periods when these waters also penetrated northward to 40.6°N. Glacial hydrographic conditions were similar during MIS 2 and 4, but much different during MIS 6. MIS 6 was a warmer glacial with the polar front being located further to the north allowing the subtropical surface and subsurface waters to reach at minimum as far north as 40.6°N and resulting in relative stable conditions on the southern margin. In the vertical structure, the Greenland-type climate oscillations during the last glacial cycle were recorded down to 2465 m during the Heinrich stadials, i.e. slightly deeper than in the western basin. This deeper boundary is related to the admixing of Mediterranean Outflow Water, which also explains the better ventilation of the intermediate-depth water column on the Iberian margin. This compilation revealed that latitudinal, longitudinal and vertical gradients existed in the waters along the Iberian margin, i.e. in a relative restricted area, but sufficient paleo-data exists now to validate regional climate models for abrupt climate change events in the northeastern North Atlantic Ocean.
Related to:
de Abreu, Lucia; Abrantes, Fatima F; Shackleton, Nicholas J; Tzedakis, Polychronis C; McManus, Jerry F; Oppo, Delia W; Hall, Michael A (2005): Ocean climate variability in the eastern North Atlantic during interglacial marine isotope stage 11: A partial analogue to the Holocene? Paleoceanography, 20, PA3009, https://doi.org/10.1029/2004PA001091
de Abreu, Lucia; Shackleton, Nicholas J; Schönfeld, Joachim; Hall, Michael A; Chapman, Mark R (2003): Millenial-scale oceanic climate variability off the Western Iberian margin during the last two glacial periods. Marine Geology, 196(1-2), 1-20, https://doi.org/10.1016/S0025-3227(03)00046-X
Martrat, Belén; Grimalt, Joan O; Shackleton, Nicholas J; de Abreu, Lucia; Hutterli, Manuel A; Stocker, Thomas F (2007): Four climate cycles of recurring deep and surface water destabilizations on the Iberian Margin. Science, 317(5837), 502-507, https://doi.org/10.1126/science.1139994
Schönfeld, Joachim; Zahn, Rainer; de Abreu, Lucia (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
Tzedakis, Polychronis C; Pälike, Heiko; Roucoux, Katherine H; de Abreu, Lucia (2009): Atmospheric methane, southern European vegetation and low-mid latitude links on orbital and millennial timescales. Earth and Planetary Science Letters, 277(3-4), 307-317, https://doi.org/10.1016/j.epsl.2008.10.027
Vautravers, Maryline J; Shackleton, Nicholas J (2006): Centennial-scale surface hydrology off Portugal during marine isotope stage 3: Insights from planktonic foraminiferal fauna variability. Paleoceanography, 21(3), PA3004, https://doi.org/10.1029/2005PA001144
Voelker, Antje H L; de Abreu, Lucia; Schönfeld, Joachim; Erlenkeuser, Helmut; Abrantes, Fatima F (2009): Hydrographic conditions along the western Iberian margin during marine isotope stage 2. Geochemistry, Geophysics, Geosystems, 10, Q12U08, https://doi.org/10.1029/2009GC002605
Project(s):
International Marine Global Change Study (IMAGES)
Coverage:
Median Latitude: 38.802697 * Median Longitude: -9.684697 * South-bound Latitude: 35.885500 * West-bound Longitude: -10.176000 * North-bound Latitude: 40.581833 * East-bound Longitude: -7.527833
Date/Time Start: 1995-07-07T00:00:00 * Date/Time End: 1999-09-15T10:18:00
Comment:
For MD99-2339 stable isotope record of Globigerina bulloides see dataset doi:10.1594/PANGAEA.733104, and for SST reconstruction see dataset: doi:10.1594/PANGAEA.733103
Size:
22 datasets

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Datasets listed in this publication series

  1. Voelker, AHL; de Abreu, L (2011): Age model of sediment core MD01-2444. https://doi.org/10.1594/PANGAEA.737145
  2. Voelker, AHL; de Abreu, L (2011): Age model of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.737133
  3. Voelker, AHL; de Abreu, L (2011): Age model of sediment core MD95-2041. https://doi.org/10.1594/PANGAEA.737128
  4. Voelker, AHL; de Abreu, L (2011): Combined stable oxygen and carbon isotope ratios of benthic foraminifera of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.737135
  5. Voelker, AHL; de Abreu, L (2011): Distribution of planktonic foraminifera in sediment core MD01-2443. https://doi.org/10.1594/PANGAEA.737154
  6. Voelker, AHL; de Abreu, L (2011): Distribution of planktonic foraminifera in sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.737141
  7. Voelker, AHL; de Abreu, L (2011): Distribution of planktonic foraminifera in sediment core MD95-2041. https://doi.org/10.1594/PANGAEA.737130
  8. Voelker, AHL; de Abreu, L (2011): Raw stable oxygen and carbon isotope ratios of benthic foraminifera of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.746475
  9. Voelker, AHL; de Abreu, L (2011): Reconstruction of sea surface temperatures of sediment core MD01-2443. https://doi.org/10.1594/PANGAEA.737174
  10. Voelker, AHL; de Abreu, L (2011): Reconstruction of sea surface temperatures of sediment core MD01-2444. https://doi.org/10.1594/PANGAEA.737146
  11. Voelker, AHL; de Abreu, L (2011): Reconstruction of sea surface temperatures of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.737142
  12. Voelker, AHL; de Abreu, L (2011): Reconstruction of sea surface temperatures of sediment core MD95-2041. https://doi.org/10.1594/PANGAEA.737131
  13. Voelker, AHL; de Abreu, L (2011): Stable carbon and oxygen isotope ratios of benthic foraminifera from sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.733112
  14. Voelker, AHL; de Abreu, L (2011): Stable carbon and oxygen isotope ratios of planktonic foraminifera from sediment core MD99-2336. https://doi.org/10.1594/PANGAEA.733107
  15. Voelker, AHL; de Abreu, L (2011): Stable carbon and oxygen isotope ratios of planktonic foraminifera in MIS4 of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.733110
  16. Voelker, AHL; de Abreu, L (2011): Stable carbon and oxygen isotope ratios of planktonic foraminifera in MIS4 of sediment core MD95-2041. https://doi.org/10.1594/PANGAEA.733108
  17. Voelker, AHL; de Abreu, L (2011): Stable oxygen and carbon isotope ratios of Globigerina bulloides of sediment core MD01-2443. https://doi.org/10.1594/PANGAEA.737159
  18. Voelker, AHL; de Abreu, L (2011): Stable oxygen and carbon isotope ratios of Globigerina bulloides of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.737413
  19. Voelker, AHL; de Abreu, L (2011): Stable oxygen and carbon isotope ratios of Globigerina bulloides of sediment core MD95-2041. https://doi.org/10.1594/PANGAEA.737129
  20. Voelker, AHL; de Abreu, L (2011): Stable oxygen and carbon isotope ratios of Globorotalia truncatolinoides in MIS3 of sediment core MD99-2339. https://doi.org/10.1594/PANGAEA.737443
  21. Voelker, AHL; de Abreu, L (2011): Stable oxygen and carbon isotope ratios of planktonic foraminifera in MIS 6 of sediment core MD01-2443. https://doi.org/10.1594/PANGAEA.737173
  22. Voelker, AHL; de Abreu, L (2011): Stable oxygen and carbon isotope ratios of planktonic foraminifera in MIS6 of sediment core MD95-2040. https://doi.org/10.1594/PANGAEA.737419