Reconstructing past hydrology of eastern Canadian boreal catchments using clastic varved sediments and hydro-climatic modelling: 160 years of fluvial inflows
| Autor: | A. Gagnon-Poiré, P. Brigode, P. Francus, D. Fortin, P. Lajeunesse, H. Dorion, A.-P. Trottier |
|---|---|
| Přispěvatelé: | Géoazur (GEOAZUR 7329), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
THIN-SECTIONS
010504 meteorology & atmospheric sciences LONG-TERM Stratigraphy lcsh:Environmental protection [SDE.MCG]Environmental Sciences/Global Changes 0208 environmental biotechnology Geopotential height Fluvial 02 engineering and technology [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology SNOW-ACCOUNTING ROUTINE 01 natural sciences lcsh:Environmental pollution Tributary lcsh:TD169-171.8 PART 2 [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology lcsh:Environmental sciences 0105 earth and related environmental sciences BIOGENIC VARVES Hydrology lcsh:GE1-350 Global and Planetary Change geography geography.geographical_feature_category Varve Discharge [SDE.IE]Environmental Sciences/Environmental Engineering Paleontology Sediment 020801 environmental engineering Boreal 13. Climate action Clastic rock Earth and Environmental Sciences PRECIPITATION lcsh:TD172-193.5 LAKE-SEDIMENTS CENTURIES NORTHERN ELLESMERE-ISLAND Geology HYDROCLIMATE VARIABILITY |
| Zdroj: | Climate of the Past Climate of the Past, European Geosciences Union (EGU), 2021, 17 (2), pp.653-673. ⟨10.5194/cp-17-653-2021⟩ CLIMATE OF THE PAST Climate of the Past, 2021, 17 (2), pp.653-673. ⟨10.5194/cp-17-653-2021⟩ Climate of the Past, Vol 17, Pp 653-673 (2021) |
| ISSN: | 1814-9324 1814-9332 |
| Popis: | Analysis of short sediment cores collected in Grand Lake, Labrador, revealed that this lake is an excellent candidate for the preservation of a laminated sediment record. The great depth of Grand Lake, the availability of fine sediments along its tributaries and its important seasonal river inflow have favoured the formation of a 160-year-long clastic varved sequence. Each varve represents 1 hydrological year. Varve formation is mainly related to spring discharge conditions with contributions from summer and autumn rainfall events. The statistically significant relation between varve parameters and the Naskaupi River discharge observations provided the opportunity to develop local hydrological reconstructions beyond the instrumental period. The combined detrital layer thickness and the particle size (99th percentile) series extracted from each varve yield the strongest correlations with instrumental data (r=0.68 and 0.75 respectively) and have been used to reconstruct the respective Naskaupi River mean and maximum annual discharges over the 1856–2016 period. The reconstructed Q-mean series suggest that high Q-mean years occurred during the 1920–1960 period, and a slight decrease in Q-mean took place during the second half of the 20th century. Independent reconstructions based on rainfall–runoff modelling of the watershed from historical reanalysis of global geopotential height fields display a significant correlation with the reconstructed Naskaupi River discharge based on varve physical parameters. The Grand Lake varved sequence contains a regional hydrological signal, as suggested by the statistically significant relation between the combined detrital layer thickness series and the observed Labrador region Q-mean series extracted from five watersheds of different sizes. |
| Databáze: | OpenAIRE |
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