GEOSCAN Search Results: Fastlink


TitleOn the reconstruction of palaeo-ice sheets: recent advances and future challenges
AuthorStokes, 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, (Open Access)
Alt SeriesEarth Sciences Sector, Contribution Series 20150238
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 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 WENS-141.0000 -50.0000 90.0000 41.7500
Subjectssurficial geology/geomorphology; Nature and Environment; ice; ice conditions; ice sheets; sheet flows; glaciology; glaciation; glacial features; Cenozoic; Quaternary
Illustrationslocation maps; block diagrams; profiles
ProgramMarine Geohazards, Public Safety Geoscience
AbstractReconstructing 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.
Summary(Plain Language Summary, not published)
This paper reviews the observational and modelling methods for reconstructing past ice sheets. The GSC contribution (by Piper and Saint-Ange) reviews the evidence for meltwater entering the oceans at the margins of ice sheets, using data acquired while studying geohazards on the eastern Canadian continental margin.