Exp. 389 Hawaiian Drowned Reefs

航海概要

テーマ

Hawaiian Drowned Reefs

• Call for Applications
• プロポーザル #716
• Scientific Prospectus: To be published

ECORDのページ＞＞こちら

航海予定期間

Offshore(乗船): September-October 2019　→延期
Onshore Science Party(航海後の陸上分析): starting in mid- to late- January 2020　→延期

※応募される際、Reasons for Interest内に参加のご都合（Onshoreのみ/Offshore-onshore両方）をご記入ください。

掘削船

Mission Specific Platform (TBD)

乗船/下船地

TBD

掘削地点

Hawaiian drowned reefs
ハワイ島近海　沈水サンゴ礁

科学目的

The overall goal of the drilling campaign is to sample a unique succession of drowned coral reefs around Hawaii now at -134 to -1155 m below sea level. As a direct result of Hawaii’s rapid (2.5-2.6/kyr) but nearly constant subsidence, a thick (100-200 m) expanded sequence of shallow coral reef dominated facies is preserved within the reefs. These reefs span important periods in Earth climate history, either not available or highly condensed on stable (Great Barrier Reef, Tahiti) and uplifted margins (Papua New Guinea, Barbados) due to a lack of accommodation space and/or unfavourable shelf morphology. Specifically, these data show that the reefs grew (for ~90-100 kyrs, albeit episodically) into, during and out of the majority of the last five to six glacial cycles.

Therefore, scientific drilling through these reefs will generate a new record of sea-level and associated climate variability during several controversial and poorly understood periods over the last 500 kyr.

The project has four major objectives:

1) To define the nature of sea level-change in the central Pacific over the last 500 kyr, we will construct a new, more complete sea level curve from the drowned Hawaiian reefs that will allow: a) more detailed testing of Milankovitch climate theory predictions and; b) improved constraints on millennial-scale sea-level changes over the last 500 kyr.

2) To identify critical processes that determine paleoclimate variability of the central Pacific over the last 500 kyr, we will: (a) reconstruct the mean and seasonal/interannual climate variability from massive coral samples; and (b) use these records to investigate how high latitude climate (e.g., ice sheet volume), pCO2, and seasonal solar radiation impact subtropical Pacific climate. This approach can be used to test theoretical predictions of climate response and sensitivity to changes in boundary conditions and climate forcing.

3) To establish the geologic and biologic response of coral reef systems to abrupt sea-level and climate changes, we will: (a) establish the detailed stratigraphic and geomorphic evolution of the reefs in response to these changes; (b) test ecologic theories about coral reef resilience and vulnerability to extreme, repeated environmental stress over interglacial/glacial to millennial time scales; and (c) establish the nature of living and ancient microbial communities in the reefs and their role in reef building.

4) To elucidate the subsidence and volcanic history of Hawaii, we will: (a) refine the variation through space and time of the subsidence of Hawaii, and; (b) improve the understanding of the volcanic evolution of the island.

詳細についてはCall for Applications、ECORDのページをご参照ください。

共同首席研究者

Jody Webster and Christina Ravelo

J-DESCからの乗船研究者

乗船者決定済

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