Antarctic Ice Sheets' dynamics: new data from provenance and paleontological analysis of IODP374 and DSDP Leg28 cores in the Ross Sea

Acronimo
AISDy
Codice
PNRA18_00233
Area di ricerca
Earth science
Tematica specifica di ricerca
Interazione tra processi glaciali, processi sedimentari ed evoluzione climatica
Regione di interesse
Central Ross Sea
Sito web progetto
PI
Matteo Perotti
Istituzione PI
Università di Siena
Sito web istituzionale
https://www.dsfta.unisi.it/it
Altre Istituzioni e soggetti coinvolti
Università di Trieste, CNR-IGG, Università di Padova
Consistenza del team ricerca
Stato progetto
In corso
Stazioni principali usate
Attività svolta in Italia
Il progetto

IODP Exp.374 recently recovered high quality cores in five sites on the Ross Sea continental shelf, slope, and rise to improve understanding of the sensitivity of the Antarctic Ice Sheets (and particularly the West Antarctic Ice Sheet - WAIS) to past climatic and oceanic conditions, especially during warmer-than-present climate. The co-proponents of this proposal have been selected and approved as shore-based Science Team members. In addition, the science team in this proposal recognize as important the study of correlative core sections from already cored drill-holes South and North of the IODP sites. Therefore some methodologies, including detailed petrology of granule to cobble size clasts analyses, AFT, U-Pb dating of detrital apatite and zircons are proposed to be extended to clast and sand-grains rich intervals in DSDP Leg 28 cores. The integration of these data with the IODP ones (this latter constituting the core portion of the studied materials) will help in better constrain ice flow modelling based on several provenance tools. The project is based on the application of a multi-disciplinary approach including; ostracod analysis, their C-O stable isotope analysis, clast petrography and petrology, and, limited to DSDP cores, also on combined detrital thermochronology and geochronology.

Immagini
  • Motivazione, importanza della ricerca

    Core and log data from a transect of six sites with cores recovered by the IODP 374 from the outer continental shelf to rise in the eastern Ross Sea (Preliminary Report, IODP EXP. 374, 2018) can be used to: (1) evaluate WAIS contribution to far-field ice volume and sea level estimates; (2) reconstruct ice proximal atmospheric and oceanic temperatures to identify periods of past polar amplification and assess forcing/feedbacks; (3) assess the role of oceanic forcing (e.g., sea level, temperature) on WAIS instability; (4) document WAIS sensitivity to Earth’s orbital configuration under varying climate boundary conditions; and (5) reconstruct eastern Ross Sea bathymetry to examine relationships among seafloor geometry, ice sheet instability, and global climate.

    Obiettivi della proposta
    Attività svolta e risultati raggiunti
    Prodotti