Journal
QUATERNARY RESEARCH
Volume 54, Issue 3, Pages 394-403Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1006/qres.2000.2176
Keywords
last glaciation; Heinrich events; Dansgaard-Oeschger cycles; Iberian Peninsula; pollen; ice-rafted detritus; dinocysts; foraminifers
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Pollen, foraminifer, dinocyst, and coarse lithic high-resolution analyses and delta O-18 measurements have been carried out for the last-glacial section of marine core MD95-2042 located near the southwestern margin of the Iberian Peninsula. The pollen data indicate a high frequency of vegetational changes on the adjacent continent during this period, suggesting a climatic variability very similar to that of the Dansgaard-Oeschger cycles recorded by the Greenland ice cores. The detailed direct correlation of the terrestrial and marine proxy data from core MD95-2042 indicates a three-phase pattern of Heinrich events in land and ocean environments. The first and last phases of the H5 and H4 events are characterized by a mild and humid climate in southwestern Europe, probably associated with the European origin of the ice-rafted detritus, The middle phase exhibits a cold and dry climate in Iberia linked with the maximum input of ice-rafted detritus. This phase seems to correspond with the Laurentide ice-sheet surges. Between the Heinrich events, several cold and dry periods on land are correlated with stades of the Dansgaard-Oeschger cycles. The impact of the Dansgaard-Oeschger stades in southwestern Europe seems to be preferentially connected to the cold winter air masses reaching this mid-latitude region. (C) 2000 University of Washington.
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