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Völpel, Rike; Mulitza, Stefan; Paul, André; Lynch-Stieglitz, Jean; Schulz, Michael (2018): Benthic oxygen isotope ratios from a transect of five gravity cores off NW Africa. PANGAEA,, Supplement to: Völpel, Rike; Mulitza, Stefan; Paul, A; Lynch-Stieglitz, Jean; Schulz, Michael (2019): Water Mass Versus Sea Level Effects on Benthic Foraminiferal Oxygen Isotope Ratios in the Atlantic Ocean During the LGM. Paleoceanography and Paleoclimatology, 34(1), 98-121,

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Depth transects of benthic foraminiferal oxygen isotopes from the Atlantic Ocean show that glacial‐interglacial changes are larger at deep (> ~2000 m) than at intermediate water levels. Our model results suggest that the smaller changes in the upper 1000 m of the water column are a result of the glacial sea‐level lowering of about 120 m, leading to warmer temperatures of around 1 °C and hence a smaller glacial‐interglacial stable oxygen isotope difference. In contrast, a shoaling of the water‐mass boundary to ~2000 m water depth between the northern source and southern source water is accompanied by the expansion of a cold (close to the freezing point) southern source water in the abyssal ocean, increasing the oxygen isotope values of benthic foraminifera from the LGM in the deep Atlantic. These two effects explain the different amplitudes of glacial‐interglacial stable oxygen isotope differences in the upper and deeper water column of the Atlantic Ocean.
Further details:
Mulitza, Stefan; Prange, Matthias; Stuut, Jan-Berend W; Zabel, Matthias; von Dobeneck, Tilo; Itambi, Achakie C; Nizou, Jean; Schulz, Michael; Wefer, Gerold (2008): Sahel megadroughts triggered by glacial slowdowns of Atlantic meridional overturning. Paleoceanography, 23(4), PA4206,
Zarriess, Michelle; Mackensen, Andreas (2010): The tropical rainbelt and productivity changes off northwest Africa: a 31,000-year high-resolution record. Marine Micropaleontology, 76(3-4), 76-91,
Median Latitude: 14.801067 * Median Longitude: -17.663800 * South-bound Latitude: 12.435000 * West-bound Longitude: -18.056667 * North-bound Latitude: 15.498333 * East-bound Longitude: -17.294000
Date/Time Start: 2005-06-15T13:51:00 * Date/Time End: 2005-06-22T03:28:00
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