Title Lichenometry on Adelaide Island, Antarctic Peninsula; size-frequency studies, growth rates and snowpatches
Author Golledge, N.R.; Everest, J.D.; Bradwell, T.; Johnson, J.S.
Author Affil Golledge, N.R., British Geological Survey, Edinburgh, United Kingdom. Other: Victoria University of Wellington, New Zealand; British Antarctic Survey, United Kingdom
Source Lichenometry in subpolar environments, edited by T. Bradwell. Geografiska Annaler. Series A: Physical Geography, 92(1), p.111- 124, . Publisher: Wiley-Blackwell published on behalf of Svenska Saellskapet foer Antropologi och Geografi, Stockholm, Sweden. ISSN: 0435-3676
Publication Date Mar. 2010
Notes In English. 52 refs. Ant. Acc. No: 91612. GeoRef Acc. No: 310336
Index Terms degree days; geochronology; lichens; models; remote sensing; snow cover; Antarctica--Adelaide Island; Antarctica-- Antarctic Peninsula; Adelaide Island; aerial photography; Antarctic Peninsula; Antarctica; calibration; frequency; glacial environment; growth rates; lichenometry; relative age; size
Abstract This paper presents new lichenometric population data from the Antarctic Peninsula (67S), and describes a new approach to lichen growth-rate calibration in locations where dated surfaces are extremely rare. We use historical aerial photography and field surveys to identify sites of former perennial snowpatches where lichen populations now exist. As an independent check on lichen mortality by snowkill, and the timing of snow patch disappearance, we use a positive-degree day (PDD) approach based on monthly climate data from Rothera Research Station. We find that maximum growth rates for lichens 40 mm in diameter on Adelaide Island are around 0.8 mm/yr. Furthermore, we propose that our combined methodology may be more widely applicable to the Polar Regions where the construction of lichenometric dating (age- size) curves remains a problem. Abstract Copyright (2010), Swedish Society for Anthropology and Geography.
URL http://hdl.handle.net/10.1111/j.1468-0459.2010.00381.x
Publication Type journal article
Record ID 65007234