NDLI: Quantitative models for reconstructing catchment ice-extent using physical-chemical characteristics of lake sediments

Content Provider	Springer Nature Link
Author	on, P.E. Birks, H.J.B. Jones, V.J. Ellis Evans, J.C.
Copyright Year	2001
Abstract	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.
Starting Page	375
Ending Page	392
Page Count	18
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	25
Issue Number	3
e-ISSN	15730417
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sedimentology Physical Geography Hydrobiology Climate Change
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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