Northern Hemisphere paleo-ice sheet topography during ice-sheet build-up phases 115-21 kyr BP, and its impact on atmospheric circulation


Project leader


Funding source

Swedish Research Council - Vetenskapsrådet (VR)


Project Details

Start date: 01/01/2011
End date: 31/12/2013
Funding: 1401000 SEK


Description

The aims are to (i) develop paleotopographical reconstructions of northern hemisphere ice sheets for time slices during the build-up phase from the last interglacial to the last glacial maximum (LGM), in particular the periods of rapid ice build-up (OIS 5d, 5b and 4), and (ii) to explore atmospheric circulation changes induced by the growing northern hemisphere ice sheets. We focus on the first-order mechanical influence of ice sheets on atmospheric circulation, expanded into ice-volume, ice-sheet location, and time domains where this has previously not been explored. The methods we employ are: (a) reliability evaluation, and synthesis of existing 2-D representations of ice sheet extent for pre-LGM time intervals, (b) numerical 3-D ice-sheet modeling constrained by the above 2-D synthesis work, and (c) atmospheric circulation modeling using the paleotopographic reconstructions resulting from the preceeding steps. The proposed project adress two fundamental information and knowledge gaps in climate science. The first is the present lack of paleotopographical data sets sufficiently reliable for numerical modeling experiments of build-up phase conditions intermediate between full interglacial (Holocene) and full-glacial (LGM). The second is an understanding of the stationary wave feedback on ice sheet growth under realistic intermediate-sized and mutiple (5-6) ice-sheet conditions, as opposed to the usually adressed LGM-conditions governed by 3 full-grown ice sheets.

Last updated on 2017-31-03 at 12:58