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Spatial and temporal sea-surface temperatures in the eastern equatorial Pacific over the past 150 kyr

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Title: Spatial and temporal sea-surface temperatures in the eastern equatorial Pacific over the past 150 kyr
Authors: Horikawa, Keiji Browse this author
Minagawa, Masao Browse this author
Murayama, Masafumi Browse this author
Kato, Yoshihisa Browse this author
Asahi, Hirofumi Browse this author
Keywords: TROPICAL PACIFIC
EL-NINO
CLIMATE
OCEAN
PALEOCLIMATE
PLEISTOCENE
ALKENONES
RECORDS
CYCLE
Issue Date: 12-Jul-2006
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 33
Issue: 13
Start Page: L13605
Publisher DOI: 10.1029/2006GL025948
Abstract: We present the new alkenone-based sea-surface temperature (SST) records from the eastern equatorial Pacific over the past 150 kyr. Core HY04 (4°N) at the North Equatorial Countercurrent (NECC) registered the invariant SSTs (25.8–27.2°C), whereas core HY06 (0°N) registered cyclic glacial-interglacial SST variations (22.4–26.1°C). Although HY06 alkenone-based SST evolution was almost consistent with the previously published SST records from around the equator, at site HY04 alkenone- and foraminiferal Mg/Ca-based SSTs showed a large difference in the magnitude of LGM SST cooling. We hypothesize that alkenone-based SSTs might not fully express the true magnitude of glacial SST cooling in the NECC, as suggested by the coincidence of higher glacial productivity and unchanged glacial SSTs at site HY04. However, further SST data in the NECC are needed before this can be accepted with any degree of confidence.
Rights: An edited version of this paper was published by AGU. Copyright 2006, American Geophysical Union, GEOPHYSICAL RESEARCH LETTERS, VOL. 33
Type: article
URI: http://hdl.handle.net/2115/14565
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 堀川 恵司

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