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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

(meters)


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

500

1000

1500

-5 -10 Mendenhall -15 -20

Gilkey Elevation (m)

2000


Planned Instrumentation on Gilkey Glacier

Joanna Young, UAF Geophysical Institute


Ground-based and airborne snow radar surveys


Data Management and Dissemination

PostgreSQL / PostGIS Database

Database

Boundaries

PRISM

LiDAR (10m)

Temperature

Precipitation

Glacier Inventory

Modern

Mass Balance

Map Date

Hypsometry

Stream Gages

Weather Stations

Stream Data

Hypsometry

Weather Data


Data Management and Dissemination

http://www2.gi.alaska.edu/~jrich


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  
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