20. Change in Volume and Annual Mass Balance
Exploring GIS in Glaciology May 24, 1012
21. Change in Volume and Annual Mass Balance
Exploring GIS in Glaciology May 24, 1012
22. Change in Volume and Annual Mass Balance
Elevation Change (1948 - 1995)
0 metres - 73 -145 metres
Exploring GIS in Glaciology May 24, 1012
23. Values Calculated by Python Script
• Average Δheight per elevation band * area
• Units: km3
• Total Volume Change / Num. of Years
• Corrected for density difference between ice and water
• Units: m3/yr; water equivalent
• (Total Volume Change / Total Area) / Num. of Years
• Units: m/yr
Exploring GIS in Glaciology May 24, 1012
24. Average Annual Change in Height (m/yr)
-0.41
-0.55
-0.13
-0.47
-0.56
-0.87
-0.9
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
-0.9
-1
Gulkana Tazlina Kennicott Wolverine LeConte Mendenhall Llewellyn
Average Annual Change in Height (m/yr)
Exploring GIS in Glaciology May 24, 1012
25. -7.99
-218.34
-32.4 -8.01
-223.64
-92.67
-623.7
0
-100
-200
-300
-400
-500
-600
-700
Gulkana Tazlina Kennicott Wolverine LeConte Mendenhall Llewellyn
Average Annual Net Balance
(* 106 m3/yr; water equivalent)
Annual Mass Balance
Exploring GIS in Glaciology May 24, 1012
29. Data Sources
Data Type Data Provider Website
Landsat Imagery USGS Global Visualization Viewer glovis.usgs.gov/
USGS DEMs Alaska Geospatial Data Clearinghouse agdc.usgs.gov/data/usgs/geodata/dem/63K/demlist_A.html
Canadian DEMs Geobase www.geobase.ca/geobase/en/data/cded/index.html
SRTM DEMs CGIAR Consortium for Spatial Information srtm.csi.cgiar.org/SELECTION/inputCoord.asp
USGS Digital Topo. Maps Alaska Geospatial Data Clearinghouse agdc.usgs.gov/data/usgs/geodata/drg/temp/drglist_A.html
Can. Digital Topo. Maps National Resources Canada – Toporama ftp://ftp2.cits.nrcan.gc.ca/pub/toporama/
Altimetry Data National Snow & Ice Data Center ftp://sidads.colorado.edu/DATASETS/NOAA/G01378
GLIMS Glacier Outlines NSIDC– GLIMS Glacier Database glims.colorado.edu/textsearch/
Benchmark mass balance data USGS Benchmark Glaciers Website ak.water.usgs.gov/glaciology/index.html
North American Outline Thematicmapping.org thematicmapping.org
Glaciated Areas - Alaska
Glaciated Areas - Yukon
Alaska State Geospatial Data Clearinghous
Geomatics, Yukon
www.asgdc.state.ak.us
www.geomaticsyukon.ca/
ESRI Basemaps OpenStreetMap and Contributors, Creative
Commons: Share Alike License
N/A
Exploring GIS in Glaciology May 24, 1012