Stable isotopes and Mg/Ca measurements of two sediment cores in the northeastern tropical Atlantic
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2011
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| _version_ | 1867168556311904256 |
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| author | Zarriess, Michelle Johnstone, Heather J H Prange, Matthias Steph, Silke Groeneveld, Jeroen Mulitza, Stefan Mackensen, Andreas |
| author_facet | Zarriess, Michelle Johnstone, Heather J H Prange, Matthias Steph, Silke Groeneveld, Jeroen Mulitza, Stefan Mackensen, Andreas |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_756443 |
| institution | PANGAEA |
| language | en |
| publishDate | 2011 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable isotopes and Mg/Ca measurements of two sediment cores in the northeastern tropical Atlantic Zarriess, Michelle Johnstone, Heather J H Prange, Matthias Steph, Silke Groeneveld, Jeroen Mulitza, Stefan Mackensen, Andreas 293; 311; AWI_Paleo; GeoB9508-5; GeoB9526-4; GeoB9526-5; Gravity corer (Kiel type); M65/1; Meteor (1986); MUC; MultiCorer; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; SL 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. |
| title | Stable isotopes and Mg/Ca measurements of two sediment cores in the northeastern tropical Atlantic |
| topic | 293; 311; AWI_Paleo; GeoB9508-5; GeoB9526-4; GeoB9526-5; Gravity corer (Kiel type); M65/1; Meteor (1986); MUC; MultiCorer; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; SL |
| url | https://doi.org/10.1594/PANGAEA.756443 |