Pollen analyses of sediment core GeoB1711-4 in the eastern South Atlantic

Influx of aeolian pollen trapped in marine sediments off Namibia provides a wind variation record for the last 135 kyr. The influx of major pollen components is derived from the southwest African desert/semi-desert zone and shows six periods during which enhanced southeast trade winds contributed to...

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Bibliographic Details
Main Authors: Shi, Ning, Schneider, Ralph R, Beug, Hans-Jürgen, Dupont, Lydie M
Format: Dataset
Language:English
Published: PANGAEA 2001
Subjects:
GeoB
GeoB1711
GeoB1711-4
Geosciences
University of Bremen
Gravity corer (Kiel type)
M20/2
Meteor (1986)
Namibia continental slope
SL
Antarctic
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.735726
https://doi.org/10.1594/PANGAEA.735726
Description
Summary:Influx of aeolian pollen trapped in marine sediments off Namibia provides a wind variation record for the last 135 kyr. The influx of major pollen components is derived from the southwest African desert/semi-desert zone and shows six periods during which enhanced southeast trade winds contributed to strong upwelling and reduced sea surface temperatures. The most prominent of these occurred during 17-23 cal. kyr, 42-56 kyr and before 130 kyr B.P. Correspondence between the pollen influx record and the Vostok deuterium isotope record suggests that pronounced glacial Antarctic cooling was accompanied by intensification of the southeast trades throughout the Late Quaternary. However, during 42-23 kyr B.P. the combination of strong Antarctic glaciation with a decrease of wind zonality induced by low latitude precessional insolation changes caused strong alongshore winds and Ekman pumping that resulted in strong upwelling and reduced sea surface temperatures without pollen influx enhancement.

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