Quantitative models for reconstructing catchment ice-extent using physical-chemical characteristics of lake sediments
Noon, P.E.; Birks, H.J.B.; Jones, V.J.; Ellis-Evans, J.C.. 2001 Quantitative models for reconstructing catchment ice-extent using physical-chemical characteristics of lake sediments. Journal of Paleolimnology, 25 (3). 373-392. 10.1023/A:1011193401627Full text not available from this repository.
The physical characteristics of surface sediments from a suite of pristine lakes on Signy Island, maritime Antarctic, were used to develop a quantitative link between catchment ice-extent and lake-sediment response. Percentage dry weight, median particle size, percentage loss-on-ignition and wet density of the lakes’ surface sediments were the most significant variables explaining contemporary catchment ice-extent. Two independent reconstruction models – Partial Least Squares (PLS) and a Modern Analog Technique (MAT) – were applied to dated sediment cores at two sites on Signy Island. The validity of the reconstructions was tested against historical information on catchment ice-extent. With sufficiently high sedimentation rates and sampling resolution, the models can predict sub-decadal changes in ice-extent. The model results are best regarded as indicators of erosion resulting from meltwater activity in the catchment. Comparison of results with Twentieth Century climate records affirms the hypothesis that climatic warming is the most likely cause for the ice retreat observed on Signy Island during the last 40 yrs. Similar reconstruction models using these simple sedimentary measures could be developed for analogous locations in the Antarctic and in Arctic and Alpine regions.
|Programmes:||BAS Programmes > Pre 2000 programme|
|Additional Keywords:||maritime Antarctic, Signy Island, lake sediments, quantitative reconstructions, catchment ice-extent, glacial retreat, climatic change|
|Date made live:||30 Oct 2012 13:39|
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