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Indian monsoon paleo-variability – MONOPOL

MONOPOL

Indian Monsoon Paleovariability

Scientific objectives of MONOPOL

The MONOPOL project seeks to retrieve and analyze expanded marine sedimentary sections from the Bay of Bengal and the Maldives area in order (1) to reconstruct Indian Monsoon sensitivity to forcings at different timescales (multi-decadal to orbital, from the upper Holocene down to several climatic cycles), with a special emphasis on monsoon precipitations and discharges of the two main river systems entering the Bay of Bengal, and (2) to study past changes in Himalaya's alteration in response to changes in monsoon intensity.<br /> The paleoceanographic and paleoclimatic reconstructions will be obtained from a multi-proxy approach, including biological (e.g. nannofossil and pollen distribution), sedimentological and geochemical proxies (e.g. Ti/Al, salinity estimates from coupled delta8O and Mg/Ca-SST), within a well-constrained chronological framework (210Pb, AMS-14C, delta18O and magnetic stratigraphy). History of the Himalaya's alteration over the last climatic cycles will be based on sedimentological (granulometry, clay mineralogy..) and geochemical proxies (Nd, Sr and Pb isotopes).

In order to fulfill these objectives, an oceanographic cruise of the R/V Marion Dufresne II has been organized the first year of the project (Task 1). The Marion Dufresne is the only vessel able to retrieve routinely large diameter, giant piston cores up to ~50m in length, which are mandatory to recover several climatic cycles in highly expanded sedimentary sections (the important quantity of materiel obtained with this large diameter corer making it possible to conduct multi-proxy studies).

The material retrieved has been brought back to France (containers) in september 2012. Sampling took place in november and analyses started about 6 months ago.
Studies in progress.

Based on preliminary studies, the next step will be to conduct high-resolution studies of key intervals (Holocene, MIS3, Mid-Pleistocene Revolution)

Studies in progress
Communications at the next ICP congress (September 2013, Barcelona, Spain) et lors du 14ème congrès de l'ASF (November 2013, Paris, )

The MONOPOL project seeks to retrieve and analyze expanded marine sedimentary sections from the Bay of Bengal and the Maldives area in order to reconstruct Indian Monsoon sensitivity to forcings at different timescales (multi-decadal to orbital, from the upper Holocene down to several climatic cycles), with a special emphasis on monsoon precipitations and discharges of the two main river systems entering the Bay of Bengal. The paleoceanographic and paleoclimatic reconstructions will be obtained from a multi-proxy approach, including biological (i.e. nannofossil and pollen distribution), sedimentological and geochemical proxies (i.e. Ti/Al, salinity estimates from coupled _18O and Mg/Ca-SST), within a well-constrained chronological framework (210Pb, AMS-14C, _18O and magnetic stratigraphy). The second major objective of MONOPOL is to reconstruct the erosional history of the Himalaya ranges over the last climatic cycles based on mineralogical and geochemical proxies (Nd, Sr and Pb isotopes), and to look at relationships with Indian monsoon rainfall variations. In order to fulfill these objectives, an oceanographic cruise of the R/V Marion Dufresne II will be organized the first year of the project (Task 1). The Marion Dufresne is the only vessel able to retrieve large diameter, giant piston cores up to ~70m in length, which are mandatory to recover several climatic cycles in highly expanded sedimentary sections (20 cm to a few meters per thousand years), making it possible to analyse – in the same records – rapid climatic variability (i.e. ENSO-like variability, Dansgaar-Oeschger cycles) under different insolation forcing conditions (orbital time scale) and with different boundary conditions (interglacials versus glacials, changes in atmospheric CO2). The cruise project has been submitted in January 2009 and september 2010 to the French Commission for Oceanographic Fleet, and ranked top Priority (P1). For a few years, however, the increasing cost of ship time has made it difficult for the French Polar Institute (IPEV) to support entirely oceanographic cruise operations. IPEV (subcontractor of partner 1) is therefore requesting that a significant share of the cruise cost (fuel expanses, food, IPEV logistic including transportation of material and cores to France) is supported by external financial sources. This amount corresponds to 318,630 euros which has been included in partner 1’s funding request. The core processing and analyses will be conducted within five tasks: (2/ Holocene variability of Indian Monsoon precipitations; 3/ Glacial variability; 4/ Indian Monsoon variability at Milankovitch timescales; 5/ Himalaya’s alteration; 6/ Data integration and synthesis). Analyses and interpretation will be conducted through the close collaboration of six laboratories, which have established a strong expertise in these fields (LSCE, CEREGE, EPOC, IPGP, MNHN and IDES). This project is part of an ongoing international collaboration within the frame of the IGBP/PAGES – IMAGES program (International Marine Global Changes Study). Foreign participations to the cruise and on-shore collaborations for the analyses of retrieved material have been agreed upon by research groups from the University of Kiel, Germany (Principal Investigator : Pr. Ralph Schneider), the University of Shanghai, China (PI : Dr Zhimin Jian); the Woods Hole Institute, USA (PI: Dr. V. Galy), and Brown University, USA (PI : Dr Steve Clemens).

Project coordination

Franck BASSINOT (CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE ILE-DE-FRANCE SECTEUR SUD) – bassinot@lsce.ipsl.fr

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

IPGP INSTITUT DE PHYSIQUE DU GLOBE DE PARIS
UPS/IDES UNIVERSITE DE PARIS XI [PARIS- SUD]
UBX1, EPOC, UMR 5805 UNIVERSITE BORDEAUX I
CNRS DR12_CEREGE CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE PROVENCE ET CORSE
LSCE CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE ILE-DE-FRANCE SECTEUR SUD

Help of the ANR 589,000 euros
Beginning and duration of the scientific project: December 2011 - 48 Months

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