Giaccio, Biagio 
ORCID: 0000-0002-7007-9127, Marino, Gianluca ORCID: 0000-0001-9795-5337, Marra, Fabrizio, Monaco, Lorenzo ORCID: 0000-0002-6555-0842, Pereira, Alison, Zanchetta, Giovanni, Gaeta, Mario, Leicher, Niklas ORCID: 0000-0002-3367-5982, Nomade, Sebastien, Palladino, Danilo M., Sottili, Gianluca, Guillou, Herve and Scao, Vincent
(2021).
Tephrochronological constraints on the timing and nature of sea-level change prior to and during glacial termination V.
Quat. Sci. Rev., 263.
OXFORD:
PERGAMON-ELSEVIER SCIENCE LTD.
ISSN 1873-457X
Abstract
Glacial-interglacial variations in ice volume and sea level are essential components of the Pleistocene global climate evolution. Deciphering the timing of change of these key climate parameters with respect to the insolation forcing is central to understanding the processes controlling glacial terminations. Here we exploit the sensitivity of the Paleo Tiber River (central Italy) to sea-level forced changes in the base level and the frequent occurrence of datable tephra layers in its sedimentary successions to reconstruct the timing of the relative sea-level (RSL) change between 450 and 403 ka, i.e., across the glacial termination (T-V) that marks the transition between Marine Isotope Stage (MIS) 12 and MIS 11. The analysis hinges on new stratigraphic data, tephra geochemical fingerprinting, and Ar-40/Ar-39 dating from a fluvial section that represents the inland counterpart of the near mouth, coastal aggradational successions of the San Paolo Formation (SPF). Tephra correlation indicates that the morpho-stratigraphic record of the inland section is as sensitive to the sea-level change as its coastal counterparts, which makes it ideal to complement previous RSL reconstructions from the Tiber River catchment basin, thereby providing a more detailed picture of the sea-level history across T-V. Combined sedimentological and morphological proxies of the composed inland-coastal SPF record document the occurrence of two phases of relatively rapid sea-level rise, here interpreted as meltwater pulse (MWP) events. The earlier MWP occurred between similar to 450 and similar to 445 ka and matches a relatively minor episode of the sea-level rise documented in an existing RSL record, while the younger MWP at similar to 430 ka corresponds to the high amplitude sea-level rise that marks T-V. We find that both MWPs coincide with episodes of ice-rafted debris deposition in the North Atlantic (Heinrich-like events) and with attendant Southern Hemisphere warming, plausibly associated with the bipolar seesaw. (C) 2021 Elsevier Ltd. All rights reserved.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| URN: | urn:nbn:de:hbz:38-601238 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.1016/j.quascirev.2021.106976 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Quat. Sci. Rev. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Volume: | 263 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Date: | 2021 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Publisher: | PERGAMON-ELSEVIER SCIENCE LTD | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Place of Publication: | OXFORD | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| ISSN: | 1873-457X | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Language: | English | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Faculty: | Unspecified | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Divisions: | Unspecified | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Subjects: | no entry | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| URI: | http://kups.ub.uni-koeln.de/id/eprint/60123 |
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