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Zarriess, Michelle; Johnstone, Heather J H; Prange, Matthias; Steph, Silke; Groeneveld, Jeroen; Mulitza, Stefan; Mackensen, Andreas (2011): Stable isotopes and Mg/Ca measurements of two sediment cores in the northeastern tropical Atlantic. PANGAEA,, Supplement to: Zarriess, M et al. (2011): Bipolar seesaw in the northeastern tropical Atlantic during Heinrich stadials. Geophysical Research Letters, 38, L04706,

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Two SST records based on Mg/Ca of G. ruber (pink) from the continental slope off West Africa at 15°N and 12°N shed new light on the thermal bipolar seesaw pattern in the northeastern tropical Atlantic during periods of reduced Atlantic Meridional Overturning Circulation (AMOC) associated with Heinrich stadials H1 to H6. The two records indicate that the latitudinal position of the bipolar seesaw's zero-anomaly line, between cooling in the North and warming in the South, gradually shifted southward from H6 to H1. A conceptual model is presented that aims to provide a physically consistent mechanism for the southward migration of the seesaw's fulcrum. The conceptual model suggests latitudinal movements of the Intertropical Convergence Zone, driven by a combination of orbital-forced changes in the meridional temperature gradient within the realm of the Hadley cell and the expansion of the Northern Hemisphere cryosphere, as a major factor.
Related to:
Zarriess, Michelle (2010): Primary Productivity and Ocean Circulation Changes on orbital and millennial Timescales off Northwest Africa during the Last Glacial/Interglacial Cycle: Evidence from benthic foraminiferal Assemblages, stable carbon and oxygen isotopes and Mg/Ca Paleothermometry. PhD Thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, 129 pp, urn:nbn:de:gbv:46-00101842-13
Median Latitude: 13.047700 * Median Longitude: -18.034883 * South-bound Latitude: 12.435000 * West-bound Longitude: -18.056667 * North-bound Latitude: 15.498333 * East-bound Longitude: -17.948000
Date/Time Start: 2005-06-15T13:51:00 * Date/Time End: 2005-06-22T03:28:00
GeoB9508-5 (293) * Latitude: 15.498333 * Longitude: -17.948000 * Date/Time: 2005-06-15T13:51:00 * Elevation: -2384.0 m * Recovery: 9.56 m * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: geology, 956 cm
GeoB9526-4 (311) * Latitude: 12.435333 * Longitude: -18.056167 * Date/Time: 2005-06-21T01:00:00 * Elevation: -3223.0 m * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 44-49 cm
GeoB9526-5 (311) * Latitude: 12.435000 * Longitude: -18.056667 * Date/Time: 2005-06-22T03:28:00 * Elevation: -3223.0 m * Recovery: 10.84 m * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: geology, 1084 cm, liner broken inside tube, potential sediment loss between 9-10-11 m.
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