| Titre | A 600-year marine record associated with the dynamics of the eastern Penny Ice Cap (Baffin Island, Nunavut, Canada) |
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| Auteur | Rodríguez-Cuicas, M E; Montero-Serrano, J C; St-Onge, G; Normandeau, A |
| Source | Journal of Quaternary Science 2023 p. 1-20, https://doi.org/10.1002/jqs.3531  Accès ouvert |
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| Année | 2023 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20220368 |
| Éditeur | John Wiley & Sons Ltd. |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1002/jqs.3531 |
| Media | papier; numérique; en ligne |
| Formats | pdf |
| Province | Nunavut |
| SNRC | 26I/15; 26I/16; 26P/01; 26P/02 |
| Région | île de Baffin |
| Lat/Long OENS | -65.0000 -64.0000 67.3333 66.8333 |
| Sujets | glaciers; antecedents de sedimentation; sediments; dynamique sédimentaire; Calotte glaciaire de Penny ; géochimie; minéralogie; sédimentologie |
| Illustrations | cartes de localisation; tableaux; profils; graphiques |
| Programme | Géoscience pour la sécurité publique Baie de Baffin |
| Diffusé | 2023 04 23 |
| Résumé | (disponible en anglais seulement)
Two composite sedimentary sequences sampled in the ice-proximal (12CS) and ice-distal (02CS) areas of Coronation Fjord (Baffin Island, Nunavut, Canada) were
investigated in order to reconstruct the effect of climate variability on 600 years of changes in sediment transfer from the eastern Penny Ice Cap (PIC). Detrital proxies, and physical and sedimentological analyses revealed that glacial meltwater
discharges led to frequent rapidly deposited layers (RDLs) in ice-proximal settings. RDLs in ice-distal settings involved the sudden release of a large quantity of sediment-laden water during floods probably originating from adjacent fjords with
large sandur deltas. Laminated sediments with ice-rafted debris throughout the Little Ice Age interval in the ice-proximal environment suggest that colder conditions promoted glacier growth, leading to successive episodes of turbid hyperpycnal
meltwater plumes and iceberg calving in Coronation Fjord. Since 1850 ce, the accelerated Coronation retreat in response to modern warming has led to increased sedimentation rates, abrupt mineralogical and grain size proxy variations and more frequent
RDLs. Similar trends between the detrital proxies of the ice-proximal core and Atlantic Multidecadal Oscillation record and Arctic surface air temperature suggest high connectivity between atmospheric and sea surface temperature variations and PIC
dynamics over the last 600 years. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Deux séquences sédimentaires composites échantillonnées dans les zones de glace proximaleet distales du fjord Coronation ont été étudiées afin
de reconstituer les changements à long terme dans les transferts de sédiments de la Penny Ice Cap (PIC) liés au climat de la fin de l'Holocène. |
| GEOSCAN ID | 330932 |
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