Glacial-interglacial variability in the delivery of dust to the central equatorial Pacific Ocean

LDEO Publication: 
Publication Type  Journal Article
Year of Publication  2006
Authors  Anderson, R. F.; Fleisher, M. Q.; Lao, Y.
Journal Title  Earth and Planetary Science Letters
Volume  242
Issue  3-4
Pages  406-414
Journal Date  Feb 28
ISBN Number  0012-821X
Accession Number  ISI:000235855100013
LDEO Publication Number  6863
Key Words  equatorial pacific; mineral aerosols; dust; sediment focusing; eolian deposition; export production; atmospheric co2; sediment traps; southern-ocean; north-atlantic; ice cores; deep-sea; climate; th-230

Fluxes of continental mineral aerosols (dust) were greater during glacial periods than during interglacials throughout most regions of the Earth. The equatorial Pacific Ocean was a possible exception to this pattern in that previous studies have reported either greater dust fluxes during interglacials or no consistent glacial-interglacial pattern of dust flux. We have applied the Th-230-normalization technique to derive five new records of dust flux from central equatorial Pacific Ocean sediments. In contrast to previous studies, which relied on stratigraphic accumulation rates, the Th-230-normalization technique produces internally consistent results, revealing fluxes to this region of continental lithogenic material that were positively correlated with global ice volume throughout the past 300,000 yr. Maximum glacial fluxes of continental mineral aerosols exceed minimum interglacial fluxes by about a factor of 2, similar to changes found elsewhere at low and mid-latitudes. This amplitude of variability is substantially smaller than that seen in some recent models, and these observations provide a calibration point for future model development. (c) 2005 Elsevier B.V. All rights reserved.


019RTTimes Cited:4Cited References Count:59

URL  <Go to ISI>://000235855100013
DOI  DOI 10.1016/j.epsl.2005.11.061