Climatic evolution of the central equatorial Pacific since the Last Glacial Maximum SCIE SCOPUS

Cited 2 time in WEB OF SCIENCE Cited 2 time in Scopus
Title
Climatic evolution of the central equatorial Pacific since the Last Glacial Maximum
Author(s)
Seo, Inah; Lee, Yuri; Lee, Yong Il; Yoo, Chan Min; Hyeong, Kiseong
KIOST Author(s)
Yoo, Chan Min(유찬민)Hyeong, Ki Seong(형기성)
Publication Year
2016-08
Abstract
This paper investigates paleoceanographic changes at a central equatorial Pacific site (6 degrees 40N, 177 degrees 28W) since the last glacial maximum using planktic foraminifera assemblages, together with the oxygen isotope (O-18) and Mg/Ca compositions of three species (Globigerinoides sacculifer, Pulleniatina obliquiloculata, and Globorotalia tumida) that dwell in the mixed layer, upper thermocline, and lower thermocline, respectively. While the Mg/Ca-derived temperatures of the mixed layer and lower thermocline varied within a narrow range from 18 ka onward, the upper thermocline temperature increased by as much as 3 degrees C during the last deglaciation (18-12 ka) with a simultaneous decrease of O-18. These changes are best explained by an enhanced mixing of the upper ocean and a reduced habitat depth separation between P. obliquiloculata and G. sacculifer during the 18-12 ka interval. The planktic foraminifera assemblage during the same period resembles modern composition at subtropical central Pacific sites that are strongly influenced by the northeasterly Trades and North Equatorial Current (NEC). We suggest that the study site, presently under the control of the Intertropical Convergence Zone (ITCZ)-North Equatorial Countercurrent, had been influenced by the northeasterly Trades and NEC during the 18-12 ka interval. This interpretation is consistent with previous documentation of a more southerly location of the ITCZ during two Northern Hemisphere cooling events; the Heinrich Stadial 1 and the Younger Dryas, and implies that the mean annual position of the ITCZ was located south of the study site, by at least 2 degrees of latitude.
ISSN
1525-2027
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2162
DOI
10.1002/2016GC006371
Bibliographic Citation
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, v.17, no.8, pp.3454 - 3468, 2016
Publisher
AMER GEOPHYSICAL UNION
Subject
GLOBIGERINOIDES-SACCULIFER BRADY; SOUTH CHINA SEA; PLANKTONIC FORAMINIFERAL ASSEMBLAGES; INTERTROPICAL CONVERGENCE ZONE; ATMOSPHERIC CO2 RISE; HEINRICH STADIAL 1; TROPICAL PACIFIC; WARM POOL; SURFACE TEMPERATURES; NORTH-ATLANTIC
Keywords
planktic foraminifera; geochemistry; micropaleontology; paleoceanography; Intertropical Convergence Zone; last deglaciation
Type
Article
Language
English
Document Type
Article
Publisher
AMER GEOPHYSICAL UNION
Related Researcher
Research Interests

Ocean Geology,Mineral resources,해양지질,광물자원

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