Indonesian Throughflow variability and its influence on global climatic events during the Pliocene and Pleistocene
Project/Area Number |
17H07412
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Research Category |
Grant-in-Aid for Research Activity Start-up
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Allocation Type | Single-year Grants |
Research Field |
Stratigraphy/Paleontology
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Research Institution | Japan Agency for Marine-Earth Science and Technology |
Principal Investigator |
AUER Gerald 国立研究開発法人海洋研究開発機構, 生物地球化学研究分野, ポストドクトラル研究員 (10802944)
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Research Collaborator |
De Vleeschouwer David
Petrick Benjamin
Christensen Beth
Gallagher Stephen
Henderiks Jorijntje
Bogus Kara
Groeneveld Jeroen
Mamo Briony
Castañeda Isla S.
Grunert Patrick
Fulthorpe Craig
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Project Period (FY) |
2017-08-25 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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Keywords | Indonesian Throufhflow / MPT / M2 glacial event / Nannoplankton / Pliocene / West Pacific Warm Pool / Leeuwin Current / Australian Climate / Indonesian Throughflow / Middle Pleistocene / Calcareous Nannoplankton / Primary Productivity / EMPT / M2-event / Biostratigraphy / M2 Glacial Event / Calcareous Nannofossils |
Outline of Final Research Achievements |
The project focused on understanding how changes in the Indonesian Throughflow (ITF) impacted climatic conditions in the Indian Ocean and the worlds global climate in the past. Today the ITF is an important part of the global ocean circulation. Changes in its flow have consequences to ocean circulation and in turn our climate. To better understand how changes in the ITF can affect the Indo-Pacific region we studied samples recovered during International Ocean Discovery Project (IODP) Expedition 356 ‘Indonesian Throughflow’. These sediments were deposited within the path of the Leeuwin Current a warm tropical currented flowing southward along the western coast of Australia. The Leeuwin current is directly fed by the ITF and records changes in its flow. The results show that both tectonic changes of the Indonesian Archipelago, as well as changes in global sea level can change the behavior of the ITF. We show how sensitive ITF was to past climate change, especially to sea level changes.
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Academic Significance and Societal Importance of the Research Achievements |
本研究の成果は,過去500万年にわたるITFの詳細な歴史を明らかにした。330万年前の氷期イベントは,現在の地球温暖化の最も良い例と考えられている。他方,中期更新世移行期(MPT)は,外部フォーシングに対する気候の応答の本質的な変化の一例である。こういった時代の研究は,私たちの地域的・全球的な気候変動に関する理解を増進させる。それは現在の地球温暖化のインパクトを予測するために用いられるコンピューター・モデルを改良するのに必須の知見である。本研究は,高解像度データとモデルの相互比較のために利用しうる貴重な基礎データを供給する。
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Report
(3 results)
Research Products
(8 results)
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[Presentation] Early to middle Miocene evolution of upwelling in the Western Arabian Sea and its link to the South Asian Monsoon-a multi-proxy re-evaluation of ODP Site 722B2018
Author(s)
Auer. G., Bialik, O.M., Ogawa, N.O., Niyazi, Y., Waldmann, N., Ohkouchi, N.
Organizer
AGU Fall Meeting 2018
Related Report
Int'l Joint Research
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[Presentation] Glacial Indonesian Throughflow weakening across the Mid-Pleistocene Climatic Transition2018
Author(s)
Petrick, B., Martinez-Garcia, A., Auer, G., Reuning, L., Deik, H., Takayanagi, H., De Vleeschouwer D., Haug, G.H.
Organizer
AGU Fall Meeting 2018
Related Report
Int'l Joint Research
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[Presentation] Indonesian Gateway restriction between 4.0 and 2.8 Ma and its impact on Indian Ocean surface waters based on calcareous nannoplankton assemblages.2018
Author(s)
Auer, G., De Vleeschouwer, D., Groeneveld, J., Bogus, K., Henderiks, J., Castaneda, I.S.
Organizer
European Geophysical Union General Assembly 2018
Related Report
Int'l Joint Research
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[Presentation] Timing of Indonesian Gateway Restriction Between 4.0 and 2.8 Ma and its Impact on Indian Ocean Surface Waters Based on Calcareous Nannoplankton Assemblages.2017
Author(s)
Auer, G., De Vleeschouwer, D., Groeneveld, J., Bogus, K., Henderiks, J., Castaneda, I.S., and Expedition 356 Shipboard Scientific Party
Organizer
American Geophysical Uniton Fall Meeting 2017
Related Report
Int'l Joint Research
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[Presentation] Marine Isotope Stage (MIS) M2 (~3.3 Ma) in the southern hemisphere: constraining the climatic drivers of a short-term glaciation event during the Pliocene warm Period.2017
Author(s)
De Vleeschouwer, D., Auer, G., Bogus, K., Groeneveld, J., Henderiks, J., Jatiningrum, R.S., Christensen, B.A.
Organizer
American Geophysical Uniton Fall Meeting 2017
Related Report
Int'l Joint Research