Lead isotopes inthe Eastern Equatorial Pacific ...

• Main Authors: Pichat, Sylvain, Abouchami, Wafa, Galer, Stephen J G
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2014
• Subjects: Antarc*; Antarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.839689; https://doi.pangaea.de/10.1594/PANGAEA.839689

The influence of atmospheric dust on climate and biogeochemical cycles in the oceans is well understood but poorly quantified. Glacial atmospheric dust loads were generally greater than those during the Holocene, as shown, for example, by the covariation of dust fluxes in the Equatorial Pacific and Antarctic ice cores. Nevertheless, it remains unclear whether these increases in dust flux were associated with changes in sources of dust, which would in turn suggest variations in wind patterns, climate or paleo-environment. Such questions can be answered using radiogenic isotope tracers of dust provenance.Here, we present a 160-kyr high-precision lead isotope time-series of dust input to the Eastern Equatorial Pacific (EEP) from core ODP Leg 138, Site 849 (0°11.59' N, 110°31.18' W). The Pb isotope record, combined with Nd isotope data, rules out contributions from Northern Hemisphere dust sources, north of the Intertropical Convergence Zone, such as Asia or North Africa/Sahara; similarly, eolian sources in ... : Supplement to: Pichat, Sylvain; Abouchami, Wafa; Galer, Stephen J G (2014): Lead isotopes in the Eastern Equatorial Pacific record Quaternary migration of the South Westerlies. Earth and Planetary Science Letters, 388, 293-305 ...