IODP Expedition 323ベーリング海掘削航海の成果と今後の展望 全球水循環・気候変動に関わる顕著な役割

IODP Exp 323ベーリング海航海は，過去500万年間の速い堆積速度の堆積物を精査することで，北半球氷床，中期更新世変遷期（MPT），海氷，中深層水とラミナ堆積物，ベーリング海峡ゲートウェイの発達史等を解明することを目的とした．掘削コアリングは，アリューシャン海盆周辺の深度分布を含む計7サイトで成功裏に実施され，高品質のAPCを主体とする総計660本，5,741m長のコアを取得した．最大到達年代は，バウワーズ海嶺で500万年前，ベーリング斜面域で250万年前で連続的な堆積物を得た．アラスカ氷床融解の当海域への影響は，430万年前に始まり，330から280-250万年前までに強化された．バ...

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Published inChishitsugaku zasshi Vol. 124; no. 1; pp. 17 - 34
Main Authors 小野寺, 丈尚太郎, 岡崎, 裕典, 高橋, 孝三, 朝日, 博史
Format Journal Article
LanguageJapanese
Published Tokyo 一般社団法人 日本地質学会 01.01.2018
Japan Science and Technology Agency
Subjects
Bering Sea
Climate change
Cores
Diatoms
Expeditions
Glaciation
Ice
Ice formation
iNHG
Intermediate water
Intermediate water masses
IODP
Meltwater
MPT
NPIW
Palaeoceanography
Paleoceanography
Pleistocene
Pliocene
Sea ice
Sea level
Bering Sea
Online AccessGet full text
ISSN0016-7630
1349-9963
DOI10.5575/geosoc.2017.0066

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Abstract IODP Exp 323ベーリング海航海は，過去500万年間の速い堆積速度の堆積物を精査することで，北半球氷床，中期更新世変遷期（MPT），海氷，中深層水とラミナ堆積物，ベーリング海峡ゲートウェイの発達史等を解明することを目的とした．掘削コアリングは，アリューシャン海盆周辺の深度分布を含む計7サイトで成功裏に実施され，高品質のAPCを主体とする総計660本，5,741m長のコアを取得した．最大到達年代は，バウワーズ海嶺で500万年前，ベーリング斜面域で250万年前で連続的な堆積物を得た．アラスカ氷床融解の当海域への影響は，430万年前に始まり，330から280-250万年前までに強化された．バウワーズ海嶺付近での本格的な海氷発達は，海氷由来化石種の多産イベントにより270万年前と220-200万年前に見られ，MPT以降では北太平洋中層水形成に影響を与えた．強い氷期におけるベーリング海峡閉鎖時には，ベーリング海で北太平洋中層水形成が強まった．
AbstractList Our understanding of the paleoceanography of the Bering Sea has been considerably advanced by IODP Expedition 323. The expedition aimed to create a high-resolution record of changes in paleoceanography since the Pliocene in a relatively high-latitude region of the North Pacific, subject to polar amplification. The expedition recovered 660 cores, mainly high-quality Advanced Piston Cores (APC), with a total length of 5741 m of continuous cores from seven sites distributed around the perimeter of the Aleutian Basin, including the Bowers Ridge, the Bering Slope edge, and the Umnak Plateau. These cores are crucial to our understanding of sea-ice distribution, productivity, laminated sediments, input of detrital materials, the formation of the North Pacific Intermediate Water mass, the Pacific water mass entry, the history of the Arctic gateway, and the enigma of the intensification of the Northern Hemisphere Glaciation and the mid-Pleistocene Transition. The maximum ages of the cores are ~5 Ma at the Bowers Ridge sites and 2.5 Ma at the Bering Slope sites. Meltwater from the Alaskan Ice Sheet has influenced the Bering Sea since 4.3 Ma, increasing in influence at 3.3 and 2.8-2.5 Ma. The significant development of sea-ice formation was identified at two sites on the Bowers Ridge at 2.7 and 2.2-2.0 Ma, based on analysis of sea-ice related diatoms and silicoflagellates. Such sea-ice formation affected the extent of the North Pacific Intermediate Water in the Bering Sea, which was strengthened during cold intervals such as when the Bering Strait closed due to falling sea level.
IODP Exp 323ベーリング海航海は，過去500万年間の速い堆積速度の堆積物を精査することで，北半球氷床，中期更新世変遷期（MPT），海氷，中深層水とラミナ堆積物，ベーリング海峡ゲートウェイの発達史等を解明することを目的とした．掘削コアリングは，アリューシャン海盆周辺の深度分布を含む計7サイトで成功裏に実施され，高品質のAPCを主体とする総計660本，5,741m長のコアを取得した．最大到達年代は，バウワーズ海嶺で500万年前，ベーリング斜面域で250万年前で連続的な堆積物を得た．アラスカ氷床融解の当海域への影響は，430万年前に始まり，330から280-250万年前までに強化された．バウワーズ海嶺付近での本格的な海氷発達は，海氷由来化石種の多産イベントにより270万年前と220-200万年前に見られ，MPT以降では北太平洋中層水形成に影響を与えた．強い氷期におけるベーリング海峡閉鎖時には，ベーリング海で北太平洋中層水形成が強まった．
Author 朝日, 博史
高橋, 孝三
小野寺, 丈尚太郎
岡崎, 裕典
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Snippet IODP Exp...
Our understanding of the paleoceanography of the Bering Sea has been considerably advanced by IODP Expedition 323. The expedition aimed to create a...
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SubjectTerms Bering Sea
Climate change
Cores
Diatoms
Expeditions
Glaciation
Ice
Ice formation
iNHG
Intermediate water
Intermediate water masses
IODP
Meltwater
MPT
NPIW
Palaeoceanography
Paleoceanography
Pleistocene
Pliocene
Sea ice
Sea level
Subtitle 全球水循環・気候変動に関わる顕著な役割
Title IODP Expedition 323ベーリング海掘削航海の成果と今後の展望
URI https://www.jstage.jst.go.jp/article/geosoc/124/1/124_2017.0066/_article/-char/ja
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Volume 124
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ispartofPNX 地質学雑誌, 2018/01/15, Vol.124(1), pp.17-34
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