NDLI: Late Holocene changes in ultraviolet radiation penetration recorded in an East Antarctic lake

Content Provider	Springer Nature Link
Author	Verleyen, Elie Hodgson, Dominic A. Sabbe, Koen Vyverman, Wim
Copyright Year	2005
Abstract	Late Holocene changes in the ultraviolet radiation (UVR) penetration in a lake in the Larsemann Hills (East Antarctica) were reconstructed using sediment core proxies based on fossil pigments (scytonemins and its derivatives) and siliceous microfossils. The influence of changes in lake depth on the UVR proxy was excluded by applying a correction, based on the non-linear relation between modern scytonemin concentrations and lake depth in a regional reference data set, and the record of past lake depths inferred using a diatom based transfer function in the sediment core. Results showed four well-defined maxima in the UVR proxy during the last 1600–1800 years, centred around 1820–1780, 1580–1490, 790–580 and 680–440 AD. Several mechanisms may account for these observed changes in UVR penetration, including past variability in cloud cover, atmospheric turbidity, ozone column depth, snow cover on the lake ice, DOM concentrations and lake-ice thickness and transparency resulting from temperature fluctuations. Although some gaps remain in our knowledge of scytonemin production in relation to the limnology of Antarctic lakes, the results highlight the importance and potential of the sediments in these highly transparent water bodies as archives of changes in past UVR receipt at the Earth’s surface.
Starting Page	191
Ending Page	202
Page Count	12
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	34
Issue Number	2
e-ISSN	15730417
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Antarctica Diatoms Larsemann Hills Pigments Scytonemin Ultraviolet radiation Sedimentology Physical Geography Hydrobiology Environment Climate Change
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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