Flux and grain size variation of eolian dust as a proxy tool for the paleo-position of the Intertropical Convergence Zone in the northeast Pacific SCIE SCOPUS

Cited 10 time in WEB OF SCIENCE Cited 12 time in Scopus
Title
Flux and grain size variation of eolian dust as a proxy tool for the paleo-position of the Intertropical Convergence Zone in the northeast Pacific
Author(s)
Hyeong, Kiseong; Yoo, Chan Min; Kim, Jonguk; Chi, Sang-Bum; Kim, Ki-Hyune
KIOST Author(s)
Hyeong, Ki Seong(형기성)Yoo, Chan Min(유찬민)Kim, Jong Uk(김종욱)Chi, Sang Bum(지상범)
Publication Year
2006-11-09
Abstract
A 328 cm-long piston core (KODOS 02-01-02) collected from the northeast equatorial Pacific at 16 degrees 12'N, 125 degrees 59'W was investigated for eolian mass fluxes and grain sizes to-test these proxies as a tool for the paleo-position of the Intertropical Convergence Zone (ITCZ). The eolian mass fluxes of the lower interval below 250 cm (15.5-7.6 Ma) are very uniform at 5 +/- 1 mg/cm(2)/10(3) yr, while those of the upper interval above 250 cm (from 7.6 Ma) are over 2 times higher than the lower interval at 12 +/- 1 mg/cm(2)/10(3) yr. The median grain size of the eolian dusts in the lower interval increases from 8.4 phi to 8.0 phi downward, while that of the upper interval varies in a narrow range from 8.8 phi to 8.6 phi. The determined values compare well in magnitude to those of central Pacific sediments for the upper interval and equatorial and southeast Pacific sediments for the lower interval.. This result suggests a possibility that the study site had been under the influence of southeast trade winds at its earlier depositional period due to the northerly position of the ITCZ, and subsequently of the northeast trade winds for a later period when the upper sediments Were deposited. This interpretation is consistent with a mineralogical and geochemical study published elsewhere that assigned the provenance of the study core dust to Central/South America for the lower interval and to Asia for the upper interval. This study suggests that the distinct differences in eolian mass flux and grain size observed across the ITCZ can be used to trace the paleo-latitude of the ITCZ. (c) 2006 Elsevier B.V. All rights reserved.
ISSN
0031-0182
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4821
DOI
10.1016/j.palaeo.2006.03.011
Bibliographic Citation
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, v.241, no.2, pp.214 - 223, 2006
Publisher
ELSEVIER SCIENCE BV
Subject
ATMOSPHERIC CIRCULATION; DEEP-SEA; EQUATORIAL PACIFIC; TRADE WINDS; DEPOSITION; HISTORY; OCEAN; SEDIMENTS; CORE; GEOCHEMISTRY
Keywords
Intertropical Convergence Zone; mass accumulation rate; grain size; eolian dust; northeast Pacific; pelagic sediments
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

deep sea mineral resources,deep sea sediments,심해저 광물자원,심해저 퇴적물,심해 환경

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