Stable isotopes and Mg/Ca measurements of two sediment cores in the northeastern tropical Atlantic
Cobertura |
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 |
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Data(s) |
25/01/2011
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Resumo |
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. |
Formato |
application/zip, 5 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.756443 doi:10.1594/PANGAEA.756443 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Relação |
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 |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Zarriess, Michelle; Johnstone, Heather J H; Prange, Matthias; Steph, Silke; Groeneveld, Jeroen; Mulitza, Stefan; Mackensen, Andreas (2011): Bipolar seesaw in the northeastern tropical Atlantic during Heinrich stadials. Geophysical Research Letters, 38, L04706, doi:10.1029/2010GL046070 |
Palavras-Chave | #293; 311; -400 years; Age; AGE; Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated, error to older; Age, dated, error to younger; Age dated; Age e -; Age e +; AWI_Paleo; C. wuellerstorfi d18O; Calculated from Mg/Ca ratios (Regenberg et al. 2009); Calendar years; Calendar years, maximum/old; Calendar years, minimum/young; Cal yrs; Cal yrs max; Cal yrs min; Cibicidoides wuellerstorfi, d18O; Comment; Depth; Depth, composite; DEPTH, sediment/rock; Depth comp; Event; Fe; GeoB9508-5; GeoB9526-4; GeoB9526-5; Globigerinoides ruber pink; Gravity corer (Kiel type); Intercore correlation; Iron; K; Lab no; M65/1; Magnesium/Calcium ratio; Mass spectrometer Finnigan MAT 251; Meteor (1986); Mg/Ca; MUC; MultiCorer; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Potassium; Reference; Reference/source; Sample, optional label/labor no; Sea surface temperature, annual mean; see reference(s); SL; SST (1-12); X-ray fluorescence core scanner (XRF), AWI |
Tipo |
Dataset |