GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitreOn the reconstruction of palaeo-ice sheets: recent advances and future challenges
AuteurStokes, C R; Tarasov, L; Blomdin, R; Cronin, T M; Fisher, T G; Gyllencreutz, R; Haetterstrand, C; Heyman, J; Hindmarsh, R C A; Hughes, L C; Jakobsson, M; Kirchner, N; Livingstone, S J; Margold, M; Murton, J B; Noormets, R; Peltier, W R; Peteet, D M; Piper, D J W; Preusser, F; Renssen, H; Roberts, D H; Roche, D M; Saint-Ange, F; Stroeven, A P; Teller, J T
SourceQuaternary Science Reviews vol. 125, 2015 p. 15-49, https://doi.org/10.1016/j.quascirev.2015.07.016
Année2015
Séries alt.Secteur des sciences de la Terre, Contribution externe 20150238
ÉditeurElsevier
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.quascirev.2015.07.016
Mediapapier; en ligne; numérique
Formatspdf
ProvinceColombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon; Nunavut
SNRC1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
Lat/Long OENS-141.0000 -50.0000 90.0000 41.7500
Sujetsglace; concentration de glace; nappes glaciaires; écoulements laminaires; glaciologie; glaciation; elements glaciaires; géologie des dépôts meubles/géomorphologie; Cénozoïque; Quaternaire
Illustrationslocation maps; block diagrams; profiles
ProgrammeRisques géo marines, Géoscience pour la sécurité publique
Résumé(disponible en anglais seulement)
Reconstructing the growth and decay of palaeo-ice sheets is critical to understanding mechanisms of global climate change and associated sea-level fluctuations in the past, present and future. The significance of palaeo-ice sheets is further underlined by the broad range of disciplines that are concerned with reconstructing their behaviour, many of which have undergone a rapid expansion since the late 1970s. In particular, there has been a major increase in the size and qualitative diversity of empirical data used to reconstruct and date ice sheets, and major improvements in our ability to simulate their dynamics in numerical ice sheet models. These developments have made it increasingly necessary to forge interdisciplinary links between sub-disciplines and to link numerical modelling with observations and dating of proxy records. The aim of this paper is to evaluate some recent developments in the methods to reconstruct ice sheets and outline some key challenges that remain, with an emphasis on how future work might integrate terrestrial and marine evidence together with numerical modelling. Our focus is on pan-ice sheet reconstructions of the last deglaciation and regional case studies are used to illustrate methodological achievements, challenges and opportunities. Whilst various disciplines have made important progress in our understanding of ice sheet dynamics, it is clear that data-model integration remains under-utilised, and that uncertainties remain poorly quantified in both empirically-based and numerical ice sheet reconstructions. The representation of past climate will continue to be the largest source of uncertainty for numerical modelling, but palaeo-observations will be critical to constrain and validate modelling. State-of-the-art numerical models will continue to improve in model resolution and in the breadth of inclusion of relevant processes, thereby enabling more accurate and more direct comparison with the increasing range of palaeo-observations. Thus, the capability is developing to use all relevant palaeo-records to more strongly constrain deglacial (and to a lesser extent pre-LGM) ice sheet evolution. In working towards that goal, the accurate representation of the uncertainties is required for both constraint data and the model output. Close cooperation between modelling and data-gathering communities is essential to ensure this capability is realised and continues to progress.
Résumé(Résumé en langage clair et simple, non publié)
Ce document passe en revue les méthodes d¿observation et de modélisation permettant de reconstituer les anciennes nappes glaciaires. La contribution de la CGC (par Piper et Saint-Ange) porte sur l¿examen de signes apparents de l¿écoulement de l¿eau de fonte dans les océans aux marges glaciaires, en utilisant des données acquises lors de l¿étude des risques géologiques à la marge continentale de l¿est du Canada.
GEOSCAN ID296962