Initiation and establishment of the Leeuwin Current system induced aridification of Australian continent

• Project/Area Number: 17K14410
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Stratigraphy/Paleontology
• Research Institution: Tohoku University
• Principal Investigator: Takayanagi Hideko 東北大学, 理学研究科, 助教 (40729208)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: レーヴィン海流 / 炭素同位体比 / 酸素同位体比 / ネオジム同位体比 / 有孔虫 / オーストラリア西部 / 第四紀 / インドネシア通過流 / オーストラリアモンスーン / 氷期－間氷期

Outline of Final Research Achievements

We investigated carbon, oxygen, and neodymium isotopes of foraminifers collected from IODP sites U1460 and U463 to delineate the history of the Leeuwin Current and its surrounding surface water masses for the last 4 million years. The cores are mainly composed of shallow water carbonates. We defined Marine Isotope Stage (MIS) of the cores using the correlation between the oxygen isotope records, calcareous nannofossil biostratigraphy, and global benthic LR04 stack from Lisiecki and Raymo (2005). Our results indicate that the modern Leeuwin Current system had initiated from ~1 million years ago, and it became a modern state after the Mid-Brunhes Event. Our records also infer that the LC was not reduced during glacial periods.

Academic Significance and Societal Importance of the Research Achievements

本研究は，有孔虫化石の炭素・酸素同位体比，ネオジム同位体比，先行研究より得られている底生有孔虫の群集組成を組み合わせることで，オーストラリア西岸を流れるレーヴィン海流の変化を過去約400万年間を通じて明らかにした．ネオジム同位体比を表層海流および表層水塊の復元に応用した例は，本研究が世界初である．その結果，同海域の海洋環境の変化を定量的に復元することができ，汎世界的な気候変動の影響のみならず，地域的な地殻変動の影響も評価することができた．また，従来，氷期の時期にレーヴィン海流が流れていなかったもしくはかなり弱化していたとされていたが，現在と同程度流れていた可能性を定量的に示すことができた，

Research Products

• [Journal Article] Hardened fecal pellets as a significant component in deep water, sub-tropical marine environments (2019)
  • Author(s): Hanaa, D., Reuning, L., Petrick, B., and Takayanagi, H.
  • Journal Title: The Depositional Record Volume: 1 Issue: 2 Pages: 1-14
  • DOI: 10.1002/dep2.64
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The enigma of rare Quaternary oolites in the Indian and Pacific Oceans: A result of global oceanographic physicochemical conditions or a sampling bias? (2018)
  • Author(s): Gallagher, S. J., Reuning, L., Himmler, T., Henderiks, J., De Vleeschouwer, D., Groeneveld, J., Rastiaar Lari, A., Fulthorpe, C.S., Bogus, K., and Expedition 356 Shipboard Scientists
  • Journal Title: Quaternary Science Reviews Volume: 200 Pages: 114-122
  • DOI: 10.1016/j.quascirev.2018.09.028
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Indonesian Throughflow drove Australian climate from humid Pliocene to arid Pleistocene (2017)
  • Author(s): Beth A. Christensen, Willem Renema, Jorijntje Henderiks, David De Vleeschouwer, Jeroen Groeneveld, Isla S. Castaneda, Lars Reuning, Kara Bogus, Gerald Auer, Takeshige Ishiwa, Cecilia M. McHugh, Stephen J. Gallagher, Craig S. Fulthorpe, and IODP Expedition 356 Scientists
  • Journal Title: Geophysical Research Letters Volume: 44 Issue: 13 Pages: 1-12
  • DOI: 10.1002/2017gl072977
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Australian shelf sediments reveal shifts in Miocene Southern Hemisphere westerlies (2017)
  • Author(s): Jeroen Groeneveld, Jorijntje Henderiks, Willem Renema, Cecilia M. McHugh, David De Vleeschouwer, Beth A. Christensen, Craig S. Fulthorpe, Lars Reuning, Stephen J. Gallagher, Kara Bogus, Gerald Auer, Takeshige Ishiwa, and Expedition 356 Scientists
  • Journal Title: Science Advances Volume: 3 Issue: 5 Pages: 1-8
  • DOI: 10.1126/sciadv.1602567
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Quantifying K, U, and Th contents of marine sediments using shipboard natural gamma radiation spectra measured on DV JOIDES Resolution (2017)
  • Author(s): De Vleeschouwer, D., Dunlea, A.G., Auer, G., Anderson, C.H., Brumsack, H., De Loach, A., Gurnis, M.C., Huh, Y., Ishiwa, T., Jang, K., Kominz, M.A., Marz, C., Schnetger, B., Murray, R.W., Palike, H., and Expedition 356 Shipboard Scientists
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 18 Issue: 3 Pages: 1-12
  • DOI: 10.1002/2016gc006715
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] History of the Leeuwin Current during the last 5 million years: Evidence from seawater Neodymium isotope variation (2018)
  • Author(s): Takayanagi, H., Wakaki, S., Irwan, Sekine, N., De Vleeschouwer, D., Bogus, K.,Ishida, T., Sato, T., Mamo, B. L., He, Y., McHugh, C. M., Reuning, L., Renema, W., Groeneveld, J., Christensen B. A., Henderiks, J., Gallagher, S. J., Fulthorpe, C. S., Ishikawa, T., Yokohama, Y., and Iryu, Y.
  • Organizer: JpGU 2018
  • Invited
• [Presentation] Miocene aridity and sabkha development: SE Indian Ocean offshore western Australia (2018)
  • Author(s): McHugh, C. M., Tagliaro, G., Fulthorpe, C., Kominz, M., Groenveld, J., He, Y., Takayanagi, H.
  • Organizer: JpGU 2018
  • Invited
• [Presentation] ネオジム同位体比による第四紀古環境復元の新たな展開 (2018)
  • Author(s): 高柳栄子・若木重行・石川剛志・井龍康文
  • Organizer: 第四紀学会年会
  • Invited
• [Presentation] Glacial Indonesian Throughflow weakening across the Mid-Pleistocene Climatic Transition (2018)
  • Author(s): Patrick, B., Martinez-Garcia, A., Auer, G., Reuning, L., Deik, H., Takayanagi, H., De Vleeschouwer, D., Haug, G. H.
  • Organizer: 2018 AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] The rapid switch from anorganic tropical carbonates to bioclastic sedimentation across a drowning unconformity (North West Shelf of Australia) (2017)
  • Author(s): L. Reuning, S. Back, S.J. Gallagher, C.S. Fulthorpe, A. R. Lari, T. Himmler, H. Iwatani, G. Auer, K. Bogus, and Expedition 356 Scientists
  • Organizer: German IODP Meeting 2017
  • Int'l Joint Research
• [Presentation] Aragonite sedimentation and dissolution on a subtropical carbonate ramp, Carnarvon Ramp, SW Shelf of Australia (2017)
  • Author(s): Hanaa Deik, Lars Reuning, Petrick Benjamin, and Expedition 356 Scientists
  • Organizer: German IODP Meeting 2017
  • Int'l Joint Research
• [Presentation] Indian Ocean Circulation changes over the Middle Pleistocene Transition (2017)
  • Author(s): B. F. Petrick, G. Auer, D. De Vleeschouwer, B. A. Christensen, C. Stolfi, L. Reuning, A. Martinez-garcia, G. Haug, T. Buckley, S. J. Gallagher, C. S. Fulthorpe, K. Bogus, IODP 356 Scientists
  • Organizer: German IODP Meeting 2017
  • Int'l Joint Research
• [Presentation] Shifts in Miocene Southern Hemisphere Westerlies and varying southward heat transport by the Leeuwin Current (2017)
  • Author(s): J. Groeneveld and Expedition 356 Scientists
  • Organizer: German IODP Meeting 2017
  • Int'l Joint Research
• [Presentation] Relationships between paleoceanographic changes and Australian monsoon variability during the Pleistocene (2017)
  • Author(s): Naoki Sekine, Hideko Takayanagi, Jeroen Groeneveld, Beth A. Christensen, Kara Bogus, Yasufumi Iryu
  • Organizer: IODP Exp. 356 Post Cruise Meeting
  • Int'l Joint Research
• [Presentation] Geochemistry of Miocene dolomites at the western Australian shelf margin: IODP Site 1464, Roebuck Basin (2017)
  • Author(s): Kosuke Yoshii, Hideko Takayanagi, Lars Reuning, Tsuyoshi Ishikawa, Shigeyuki Wakaki, Koshi Yamamoto, Yasufumi Iryu
  • Organizer: IODP Exp. 356 Post Cruise Meeting
  • Int'l Joint Research
• [Presentation] Oxygen and neodymium isotopes of Pleistocene foraminifers from IODP sites U1460 and U1463: preliminary results (2017)
  • Author(s): Hideko Takayanagi, Irwan, Naoki Sekine, David De Vleeschouwer, Jeroen Groeneveld, Beth A. Christensen, Lars Reuning, Yasufumi Iryu
  • Organizer: IODP Exp. 356 Post Cruise Meeting
  • Int'l Joint Research
• [Presentation] Australian Northwest Shelf: A Late Neogene Reversible Tectonic Event (2017)
  • Author(s): Michelle Kominz, Michael Gurnis, Stephen J. Gallagher, and Expedition 356 Scientists
  • Organizer: 2017 AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] Late Pleistocene Age Model for Site U1460, Perth Basin, SW Australian Shelf: Implications for Leeuwin Current History (2017)
  • Author(s): B. Christensen, H. Takayanagi, Benjamin Petrick, Takeshiga Ishawa, Jori Henderiks, Jeroen Groeveld, Briony Mamo, David DeVleeschouwer, Gerald Auer, Hanaa Deik, Erwan, Craig Fulthorpe, Stephen Gallagher, Cecilia McHugh, Lars Reuning
  • Organizer: 2017 AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] Mid-Pliocene to Early Pleistocene land and sea surface temperature history of NW Australia based on organic geochemical proxies (2017)
  • Author(s): Rebecca Smith, Isla S. Castaneda, Jorijntje Henderiks, Beth A. Christensen, David De Vleeschouwer, Willem Renema, Jeroen Groeneveld, Kara Bogus, Stephen J. Gallagher, Craig S. Fulthorpe, and IODP Expedition 356 Scientists
  • Organizer: 2017 AGU Fall Meeting
  • Int'l Joint Research