EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

A Campaign of Scientific Drilling for Monsoon Exploration in the Asian Marginal Seas

Peter Clift1, Christian Betzler2, Steven Clemens3, Beth Christensen4, Gregor Eberli5, Christian France-Lanord6, Stephen Gallagher7, Ann Holbourn8, Wolfgang Kuhnt8, Richard Murray9, Yair Rosenthal10, Ryuji Tada11, and Shiming Wan12
Peter Clift et al.
  • 1Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, USA
  • 2Institute for Geology, German Research Fleet Coordination Center, University of Hamburg, Bundesstrasse 55, 20146 Hamburg
  • 3Department of Earth, Environmental and Planetary Sciences, Box 1846 Brown University, Providence, RI., 02912-1846, USA
  • 4Department of Environmental Science, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, USA
  • 5Center for Carbonate Research, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA
  • 6Centre de Recherches Pétrographiques et Géochimiques, Université de Nancy, CNRS UMR 7358, F-54500, Vandoeuvre-lès-Nancy, France
  • 7School of Earth Sciences, The University of Melbourne, Victoria, 3010, Australia
  • 8Institute of Geosciences, Christian-Albrechts-University, Olshausenstrasse 40, D-24118 Kiel, Germany
  • 9Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
  • 10Department of Marine and Coastal Sciences, Rutgers, The State University of New Jersey, 71 Dudley Road, New Brunswick, NJ 08901-8520, USA
  • 11Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo, 113-0033, Japan
  • 12Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, Shandong Province, 266071, China

International Ocean Discovery Program (IODP) conducted a series of expeditions between 2014 and 2016 that were designed to address the development of monsoon climate systems in Asia and Australia. Significant progress was made in recovering Neogene sections spanning the region from the Arabian Sea to the Japan Sea and south to western Australia. High recovery by advanced piston core (APC) technology has provided a host of semi-continuous sections that have been used to examine monsoonal evolution. Use of half APC was successful in sampling sand-rich sediment in Indian Ocean submarine fans. The records show that humidity and seasonality developed diachronously across the region, although most regions show drying since the middle Miocene and especially since ~4 Ma, likely linked to global cooling. The transition from C3 to C4 vegetation often accompanied the drying, but may be more linked to global cooling. Western Australia, and possibly southern China diverge from the general trend in becoming wetter during the late Miocene, with the Australian monsoon being more affected by the Indonesian Throughflow, while the Asian Monsoon is tied more to the rising Himalaya in South Asia and to the Tibetan Plateau in East Asia. The monsoon shows sensitivity to orbital forcing, with many regions having a weaker summer monsoon during times of Northern Hemispheric Glaciation. Stronger monsoons are associated with faster continental erosion, but not weathering intensity, which either shows no trend or decreasing strength since the middle Miocene in Asia. Marine productivity proxies and terrestrial environmental proxies are often seen to diverge. Future work on the almost unknown Paleogene is highlighted, as well as the potential of carbonate platforms as archives of paleoceanographic conditions.

How to cite: Clift, P., Betzler, C., Clemens, S., Christensen, B., Eberli, G., France-Lanord, C., Gallagher, S., Holbourn, A., Kuhnt, W., Murray, R., Rosenthal, Y., Tada, R., and Wan, S.: A Campaign of Scientific Drilling for Monsoon Exploration in the Asian Marginal Seas, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-1509,, 2022.