Visualisation of changes in alpine glaciers in western Canada Roger Wheate, University of Northern BC Mt. Sir MacDonald and Illecillewaet Glacier, 1902.

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Presentation transcript:

Visualisation of changes in alpine glaciers in western Canada Roger Wheate, University of Northern BC Mt. Sir MacDonald and Illecillewaet Glacier, 1902 (~end of Little Ice Age (LIA)

1885 Illecillewaet Glacier, Glacier National Park

2011

Thompson Glacier, Axel Heiberg Island, 1965

Glaciers viewed as constant in 1960s-70s

1981 Columbia Icefield elevation data are not updated: roads, glaciers from 1980; contours from 1960

Western Canada (BC / Alberta) ~15,000 glaciers BC ~25,000 km 2 Alberta: 1,000 km 2

Mt. Edziza 1965 yellow 1982 red (from air photo mapping) 2005 white (Landsat) accumulation area - black

Robson Glacier

1923 British Columbia-Alberta boundary commission map

Cambrian Icefield, Coast Mountains

Maligne Lake glaciers, Jasper NP Maligne Lake area : total loss of km 2 (from 79.5 km 2 ) or % per year. Between 2000 and 2010, the rate increased to 2.23% per year

Sources: map contours, stereo photography, spaceborne DEMs: e.g. SRTM, ASTER GDEM Current changes ~ -5m/year Sources: maps, air photos, satellite images Current changes ~ -20m/year Thinning Retreat

Techniques for showing elevation change (DEM subtraction: Haeberli and Paul, 2009)

Hoodoo Mountain area: Landsat TM 2010

Hoodoo Glacier: extents 1965 to 2005 (overlain on Landsat TM 2010) 1965, 1982 from aerial photos, 1999 and 2005 from Landsat

NTDB 1965: DEM from contours; geogratis.ca

BC ‘TRIM’ mapping 1982: digital stereophotography; geobase.ca

Shuttle Radar Topography Mission (SRTM) 1999 (spaceborne)

ASTER GDEM 2000 – 2008 (~2004) multiple images

DEM Difference Image: NTDB (1965) – ASTER (2004)

NTDB 1965 Salmon Glacier area Alaska / BC

BC TRIM 1985

SRTM 1999

ASTER 2004

230 0 DEM subtraction NTDB – ASTER 0-230m (unclassed)

Final map product

Severnaya Zemlya: Glacier changes s dib.joanneum.at/smaragd

Severnaya Zemlya: Glacier changes in s

Landsat image, Zermatt 01/09/2010 downloaded 03/09/2010 – geotiff (free Landsat archive: glovis.usgs.gov) GlobGlacier workshop, Zermatt 01/09/2010

December 1989

January 2010

Feb 2006

April 2004

June 2006

August 2005

Final slide * Visualisation images to be displayed at: glacierchange.org (public input website run by Ph.D student Matt Beedle) * New millennium global glacier extents: glims.org/RGI/randolph.html Acknowledgements Thanks to reviewers comments Selected images by : Anastasia Gurov, Ulrike Schinke, Jacob Trultzch (Dresden TU) Sabrina Marx, Marlene Baumgart (Bonn, Heidelberg)