GEOSCAN, résultats de la recherche


TitreLate Pleistocene-Holocene marine geology of Nares Strait region: palaeoceanography from foraminifera and dinoflagellate cysts, sedimentology and stable isotopes
AuteurMudie, P J; Rochon, A; Prins, M A; Soenarjo, D; Troelstra, S R; Levac, E; Scott, D B; Roncaglia, L; Kuijpers, A
SourcePolarforschung vol. 74, (2004), no. 1-3, 2006 p. 169-183
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 2004264
Documentpublication en série
Mediapapier; en ligne; numérique
SNRC28; 29; 38; 39; 48; 49; 120; 340
Lat/Long OENS -96.0000 -56.0000 84.0000 72.0000
Sujetscarottes; carottes de sédiment marin; microfossiles; palynomorphes; bioturbation; argiles; boues; matières organiques; paléohydrologie; isotopes d'oxygène; changement climatique; Nature et environnement
Illustrationslocation maps; seismic reflection profiles; core logs; photographs; graphs
ProgrammeRéduire la vulnérabilité du Canada au changement climatique
Résumé(disponible en anglais seulement)
Detailed studies of sediment texture, microfossils, palynomorphs and stable isotopes were made on radiocarbon dated cores from the north and the south ends of Nares Strait, near the entrance to the Northwest Passage. Quantitative reconstructions of past changes in sea surface temperature, salinity and sea ice cover show that during the past ~7,000 years, there have been large multidecadal-scale climatic oscillations in the Jones Sound area, ranging from lows of 3°C colder than now, with 2 months more ice cover, and increasing up to highs of 6°C warmer than now, with 6 months of open water. Sedimentological and foraminiferal data also clearly establish that Hall Basin at the north end of Nares Strait was not filled by grounded ice during the past 14,000 years, in contradiction to regional models that are based on onshore data.