High resolution reconstruction of Holocene sea surface temperature in the Southern Ocean and the Arctic Ocean

2015 Fiscal Year Final Research Report

• Project/Area Number: 25287136
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: Hokkaido University
• Principal Investigator: Yamamoto Masanobu 北海道大学, 地球環境科学研究科(研究院), 准教授 (60332475)
• Co-Investigator(Kenkyū-buntansha): IRINO Tomohisa 北海道大学, 大学院地球環境科学研究院, 助教 (70332476)
• Co-Investigator(Renkei-kenkyūsha): YOKOYAMA Yusuke 東京大学, 大気海洋研究所, 教授 (10359648)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 南極 / 北極 / 古海洋 / 古気候 / TEX86 / 鉱物 / 堆積物

Outline of Final Research Achievements

TEX86 analysis indicated that sea surface temperature (SST) decreased from 12,000 years ago to 3,000 years ago and increased afterward off Wilkes Land in the Southern Ocean. In the Chukchi Sea of the Arctic, SST increased since 9,000 years ago. Both areas showed significant millennial-scale SST variability. In the Chukchi Sea core, the chlorite/illite ratio showed higher values in the middle Holocene, suggesting the intensified Bering Strait inflow. The Quartz/feldspar ratios showed a decreasing trend, suggesting a decline of the Beaufort Gyre circulation since 9,000 years ago.

Free Research Field

古海洋学