International Ocean Discovery Program Expedition 353 preliminary report; Indian monsoon rainfall; 29 November 2014-29 January 2015

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doi: 10.14379/iodp.pr.353.2015
Author(s): Clemens, Steven C.; Kuhnt, Wolfgang; LeVay, Leah J.; Anand, Pallavi; Ando, Takuto; Bartol, Milos; Bolton, Clara T.; Ding Xuan; Gariboldi, Karen; Giosan, Liviu; Hathorne, Edmund C.; Huang, Yongsong; Jaiswal, Priyank; Kim, Sunghan; Kirkpatrick, John B.; Littler, Kate; Marino, Gianluca; Martinez, Philippe; Naik, Dinesh; Peketi, Aditya; Phillips, Stephen C.; Robinson, Marci M.; Romero, Oscar E.; Sagar, Netramani; Taladay, Katie B.; Taylor, Samuel N.; Thirumalai, Kaustubh; Uramoto, Goichiro; Usui, Yoichi; Wang Jiasheng; Yamamoto, Masanobu; Zhou Liping
International Ocean Discovery Program, Expedition 353 Scientists, College Station, TX
Author Affiliation(s): Primary:
Brown University, Department of Geological Sciences, Providence, RI, United States
Other:
Christian-Albrechts-Universität zu Kiel, Germany
International Ocean Discovery Program, United States
Open University, United Kingdom
Hokkaido University, Japan
Uppsala University, Sweden
CEREGE, France
China University of Geosciences-Beijing, China
Universita di Pisa, Italy
Woods Hole Oceanographic Institution, United States
GEOMAR-Research Center for Marine Geosciences, Germany
Oklahoma State University, United States
Busan National University, South Korea
University of Rhode Island, United States
University of Exeter, United Kingdom
Australian National University, Australia
University of Bordeaux, France
National Institute of Oceanography, India
University of New Hampshire, United States
U. S. Geological Survey, United States
University of Bremen, Germany
National Geophysical Research Institute, India
University of Hawaii-Manoa, United States
Institut de Physique du Globe de Paris, France
University of Texas-Austin, United States
Japan Agency for Marine-Earth Science and Technology, Japan
China University of Geosciences-Wuhan, China
Peking University, China
Source: Preliminary Reports (International Ocean Discovery Program), Vol.353, 46p. Publisher: International Ocean Discovery Program, College Station, TX, United States. ISSN: 2372-9562
Note: In English. 151 refs.
Summary: International Ocean Discovery Program (IODP) Expedition 353 (29 November 2014-29 January 2015) drilled six sites in the Bay of Bengal, recovering 4280 m of sediments during 32.9 days of on-site drilling. Recovery averaged 97%, including coring with the advanced piston corer, half-length advanced piston corer, and extended core barrel systems. The primary objective of Expedition 353 is to reconstruct changes in Indian monsoon circulation since the Miocene at tectonic to centennial timescales. Analysis of the sediment sections recovered will improve our understanding of how monsoonal climates respond to chan ges in forcing external to the Earth's climate system (i.e., insolation) and changes in forcing internal to the Earth's climate system, including changes in continental ice volume, greenhouse gases, sea level, and the ocean-atmosphere exchange of energy and moisture. All of these mechanisms play critical roles in current and future climate change in monsoonal regions. The primary signal targeted is the exceptionally low salinity surface waters that result, in roughly equal measure, from both direct summer monsoon precipitation to the Bay of Bengal and runoff from the numerous large river basins that drain into the Bay of Bengal. Changes in rainfall and surface ocean salinity are captured and preserved in a number of chemical, physical, isotopic, and biological components of sediments deposited in the Bay of Bengal. Expedition 353 sites are strategically located in key regions where these signals are the strongest and best preserved. Salinity changes at IODP Sites U1445 and U1446 (northeast Indian margin) result from direct precipitation as well as runoff from the Ganges-Brahmaputra river complex and the many river basins of peninsular India. Salinity changes at IODP Sites U1447 and U1448 (Andaman Sea) result from direct precipitation and runoff from the Irrawaddy and Salween river basins. IODP Site U1443 (Ninetyeast Ridge) is an open-ocean site with a modern surface water salinity very near the global mean but is documented to have recorded changes in monsoonal circulation over orbital to tectonic timescales. This site serves as an anchor for establishing the extent to which the north to south (19°N to 5°N) salinity gradient changes over time.
Year of Publication: 2015
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Atmospheric circulation; Bay of Bengal; Biostratigraphy; Boreholes; Cenozoic; Chemostratigraphy; Cores; Correlation; Cretaceous; Diatoms; Drilling; Expedition 353; Foraminifera; IODP Site U1443; IODP Site U1444; IODP Site U1445; IODP Site U1446; IODP Site U1447; IODP Site U1448; Indian Ocean; International Ocean Discovery Program; Invertebrata; Lithostratigraphy; Magnetostratigraphy; Marine drilling; Marine sediments; Mesozoic; Microfossils; Nannofossils; Ocean circulation; Physical properties; Planning; Plantae; Pleistocene; Protista; Quaternary; Sediments; Tertiary; Upper Cretaceous; Water masses
Coordinates: N052300 N190500 E0930000 E0844700
Record ID: 2015044801
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