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Southeast Test Case - Year 1 Update Understanding the contribution of glacier runoff to freshwater flux in the Gulf of Alaska

Southeast Test Case: Physical System Snowpack

Estuary Ocean

Lake River

Graphic: Kristin Timm

Southeast Test Case: Physical System

Graphic: Kristin Timm

Elevation Changes from Altimetry

Visible Band Satellite Imagery

Elevation Changes from Altimetry

Airborne Altimetery

Elevation Changes from Altimetry

Satellite Gravimetry

Melt Modeling

Assessment of glacier mass changes in Alaska

Alaska Glaciers contribute 7% to global sea level rise

(Luthcke, Arendt and others, 2013)

Assessment of glacier mass changes in Alaska Mass Amplitude

cm water equivalent

(Luthcke et al, 2008)

Southeast Test Case: Study Area

Changes in Glacier Extent

Elevation Changes from Altimetry


Installing ablation wires on Gilkey Glacier

W. Pat Dryer Jason Amundson

Point Mass Balance Data: 2013

Jeff Kavanaugh Jamie Bradshaw

Mass balance stake measurements

Point mass balance data: Comparison to Mendenhall 10

mass balance (m/yr)

5 0 0




-5 -10 Mendenhall -15 -20

Gilkey Elevation (m)


Planned Instrumentation on Gilkey Glacier

Joanna Young, UAF Geophysical Institute

Ground-based and airborne snow radar surveys

Data Management and Dissemination

PostgreSQL / PostGIS Database




LiDAR (10m)



Glacier Inventory


Mass Balance

Map Date


Stream Gages

Weather Stations

Stream Data


Weather Data

Data Management and Dissemination

Acknowledgements Funding

Collaborators J. Freymueller, A. Gusmeroli, A. Gardner, D. Hill, E. Hood, R. Hock, C. Larsen, A. Liljedahl , M. Loso, S. Luthcke, S. O’Neel, S. Pyare, G. Wolken Students/Technicians C. Beedlow, J. Davis, S. Herreid, A. Johnson, C. Kienholz, N. Murphy, J. Rich, J. Young

Temperature Index Melt Model

M = (σ + α K)T+ σ = melt factor (tuning parameter) α = radiation factor for snow or ice surface (tuning parameter) K = direct potential solar radiation calculated from topography and solar geometry T+ = positive degree-days (input)

Temperature Index Melt Model

• Air temperature • Solid precipitation

M = (σ + α K)T+ • Simulated mass balance CALIBRATION • Mass balance observations

Anthony arendt setc  
Anthony arendt setc