Citation:

feart.2017.00012

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Abstract:

Shallow lakes are common across the entire Arctic. They play an important role as methane sources and wildlife habitats, and they are also associated with thermokarst processes which are characteristic of permafrost environments. Many lakes freeze to the ground along their rims and often over the entire extent during winter time. Knowledge on the spatial patterns of ground-fast and floating ice is important as it relates to methane release, talik formation and hydrological processes, but no circumpolar account of this phenomenon is currently available. Previous studies have shown that ground-fast ice can easily be detected using C-band Synthetic Aperture Radar (SAR) backscatter intensity data acquired from satellites. A major challenge is that backscatter intensity varies across the satellite scenes due to incidence angle effects. Circumpolar application therefore requires the inclusion of incidence angle dependencies into the detection algorithm. An approach using ENVISAT ASAR Wide Swath data (approximately 120 m spatial resolution) has therefore been developed supported by bathymetric measurements for lakes in Siberia. This approach was then further applied across the entire Arctic for late winter 2008. Analyses of lake depth measurements from several sites suggest that the used method yields the potential to utilize ground-fast lake ice information over larger areas with respect to landscape development, but results need to be treated with care, specifically for larger lakes and along river courses. Lakes like the Great Slave Lake, Great Bear Lake and lakes located in the proximity of the Putorana Plateau were excluded from the analyses.

Coverage:

Latitude: 90.000000 * Longitude: 0.000000

Event(s):

pan-Arctic * Latitude: 90.000000 * Longitude: 0.000000 * Location: Arctic

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	File name	File name		Bartsch, Annett
2	File format	File format		Bartsch, Annett
3	File size	File size	kByte	Bartsch, Annett	zipped
4	Uniform resource locator/link to file	URL file		Bartsch, Annett

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

8 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 File name	2 File format	3 File size [kByte]	4 URL file
Analyses_extent_grounded_lake_ice	Shapefile	2356	Analyses_extent_grounded_lake_ice.zip
Bartsch_ground_fast_lake_ice_2008_ASARWS	Shapefile	187081	Bartsch_ground_fast_lake_ice_2008_ASARWS.zip