Exp. 373 Antarctic Cenozoic Paleoclimate

航海概要

テーマ

Antarctic Cenozoic Paleoclimate

プロポーザル#813-Full＞＞こちら（フルバージョン）
プロポーザル#813-Add＞＞こちら（フルバージョン）

Scientific Prospectus＞＞To be published

航海予定期間

Offshore phase: 2017年12月24日～2018年2月22日
Onshore Science Party(OSP): 2018年　夏ごろ（TBD）@Bremen
※OSPへの参加が必須となります（Offshore phaseに参加するのは一部の研究者となります）。
本航海は延期されました

掘削船

Mission Specific Platform (TBD)

乗船/下船地

TBD

掘削地点

科学目的

The proposal upon which this expedition is based was submitted as IODP Proposal 813-Full and Addendum 813-Add ‘Greenhouse to Icehouse Antarctic paleoclimate and ice history from George V Land and Adélie Land shelf sediments’.

The George V and Adélie Land continental shelf of East Antarctica contains a record of Antarctica’s climate and ice history from the warm and vegetated landscapes of Eocene greenhouse climates to latest Eocene glacial inception and the dynamic ice-sheet margins. Because of the gently dipping strata and glacial erosion, sediments of a wide age range reach close to the sea bed and are accessible through shallow drilling by robotic seafloor drills.

The history of this Antarctic margin includes warm-world high-CO2 environments, which will help to understand Antarctic climate and the limits of ice-sheet stability under future global warming. Up to now there are extremely few well-recovered Eocene sediment sequences from Antarctica, and we aim to fill this gap in knowledge.

Drilling will investigate:

1. Antarctica’s climate during Early/Middle Eocene greenhouse warmth, including cyclicity, temperatures, and vegetation, to address the pole-equator temperature gradient and find possible evidence for DeConto’s permafrost hypothesis for hyperthermals;
2. Climate cooling over the late Eocene in advance of main glacial inception – were there precursor glaciations? What conditions led to Antarctica becoming the ice-covered continent we see today?
3. The timing, environmental conditions, and extent of major ice advance at the Eocene/Oligocene boundary (~34 Ma), and the role of glacial isostatic adjustment (GIA) – e.g., relative sea level rise adjacent to expanding ice sheets;
4. Oligocene ice and climate conditions, which are only poorly known. It should be noted that the recovery of Oligocene sediments is uncertain at this time.

If the primary sites are inaccessible due to ice conditions, partly equivalent strata can be drilled at alternate sites. Also, Cretaceous and Miocene to Pliocene sediments are available at alternate sites that could address additional objectives, such as to enable dating of strata bounding major unconformities that can result from glacial advances and GIA-related vertical crustal motion.

The expedition aims to drill, core, and log between eight and eighteen 50-m-deep boreholes on the George V Land and Adélie Land continental shelf of East Antarctica, using the British Geological Survey Rockdrill 2 (RD2), deployed from the RVIB Nathaniel B. Palmer, operated by the Lockheed-Martin Antarctic Support Contract (ASC) for the U.S. National Science Foundation’s United States Antarctic Program (USAP).

共同首席研究者

Trevor Williams and Carlota Escutia

J-DESCからの乗船研究者

選定中

乗船に関わるサポート情報

乗船研究者としてIOから招聘される方には乗船前から乗船後に至る過程の数年間に様々なサポートを行っています。主な項目は以下の通りです。

1. プレクルーズトレーニング：乗船前の戦略会議やスキルアップトレーニング
2. 乗船旅費：乗下船に関わる旅費支援
3. アフタークルーズワーク：モラトリアム期間中の分析
4. 乗船後研究：下船後最長3年で行う研究の研究費

乗船の手引き（乗船前準備や船上作業・生活方法に関する経験者からのアドバイス集）＞＞こちら

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