Regionalization of the Atmospheric Dust Cycle on the Periphery of the East Antarctic Ice Sheet Since the Last Glacial Maximum

• Published in: Geochemistry, Geophysics, Geosystems
• Main Authors: Baccolo, G., Delmonte, B., Albani, Samuel, Baroni, C., Cibin, G., Frezzotti, M., Hampai, D., Marcelli, A., Revel, Marie, Salvatore, C., Stenni, B., Maggi, V.
• Other Authors: Department of Earth and Environmental Sciences Milano, Università degli Studi di Milano-Bicocca = University of Milano-Bicocca (UNIMIB), Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Earth Sciences Department, University of Pisa - Università di Pisa, DIAMOND Light source, Italian National agency for new technologies, Energy and sustainable economic development Frascati (ENEA), INFN Frascati, Istituto Nazionale di Fisica Nucleare (INFN), Géoazur (GEOAZUR 7329), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ), Department of Environmental Sciences, Informatics and Statistics Venezia, University of Ca’ Foscari Venice, Italy
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2018
• Subjects: [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; Antarc*; Antarctic; Antarctica; East Antarctica; ice core; Ice Sheet; Ross Sea; Victoria Land
• Online Access: https://hal.science/hal-02196120; https://hal.science/hal-02196120/document; https://hal.science/hal-02196120/file/2018GC007658.pdf; https://doi.org/10.1029/2018GC007658

International audience Ice cores from inner East Antarctica provided some of the longest and most detailed climatic reconstructions and allowed understanding the relationships between atmospheric mineral dust and climate. In this work we present synchrotron radiation X‐ray Fluorescence geochemical data of dust from the TALDICE ice core drilled at Talos Dome, a peripheral ice dome of East Antarctica (Western Ross Sea). Results highlight a dominant southern South American origin for dust at TALDICE during the Last Glacial Maximum, similarly to other sites located further inland onto the polar plateau. On the contrary, a different scenario concerns Talos Dome during the Holocene if it is compared to more inner sites. The tight connection between high southern latitudes and Antarctica that characterizes cold climate stages becomes weaker since the onset of the last climatic transition and throughout the Holocene. The net effect of this process at Talos Dome is a modification of the atmospheric and environmental settings, owing to local Antarctic sources of Victoria Land to gain importance and become the dominant ones. At the same time in inner East Antarctica the provenance of dust remains remote also during Holocene, revealing an evolution of the homogeneous scenario observed in glacial periods. The enhanced sensitivity of peripheral ice sheet sites to local dust sources makes Talos Dome an ideal site to assess the climatic and atmospheric changes of the peripheral sectors of East Antarctica during the current interglacial period.