Reconstruction of climate change over the past a couple of centuries using lake verve sediment

2014 Fiscal Year Final Research Report

• Project/Area Number: 24651019
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: HARADA Naomi 独立行政法人海洋研究開発機構, 地球環境観測研究開発センター, 研究開発センター長代理 (70344281)
• Co-Investigator(Kenkyū-buntansha): NAGASHIMA Kana 独立行政法人海洋研究開発機構, 地球環境観測研究開発センター, 技術研究員 (90426289)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 古気候 / 湖堆積物 / 偏西風 / ダスト

Outline of Final Research Achievements

The purpose of this study is to understand the past environmental change over the past decades in the northern Japan where is the blank area and period of paleoclimatology, although the importance of reconstruction during the past centuries is described by IPCC report. We used the lake sediment core, Ichinomegata in Akita prefecture. This core has lamination and records annual or seasonal environmental change. We focused on the understanding the north and south migration of Westerly associated with climate change over the past 60 years. The northward prominent of Westerly means relatively warm climate in the northern Japan and vice versa. As a result, dust supply from the Taklimakan increased as compared with that from the Gobi in the beginning of 1960's, from the end of 1970's to early 1980's. The decadal oscillation that major dust source Desert changes between Taklimakan and Gobi might be related to the decadal oscillation of the Westerly north and south migration.

Free Research Field

古環境学