Thanks SO Much for ALL the Data: The Amundsen Sea Sector Data Set: Applications with UMISM: Where and How Much WATER? What WILL happen in the future? James L Fastook University of Maine We thank the NSF, which has supported the development of this model over many years through several different grants.
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Thanks SO Much for ALL the Data: The Amundsen Sea Sector Data Set: Applications with UMISM: Where and How Much WATER? What WILL happen in the future? James.
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Thanks SO Much for ALL the Data: The Amundsen Sea Sector Data Set:
Applications with UMISM: Where and How Much WATER? What WILL happen in the future?
Thanks SO Much for ALL the Data: The Amundsen Sea Sector Data Set:
Applications with UMISM: Where and How Much WATER? What WILL happen in the future?
James L Fastook
University of Maine
We thank the NSF, which has supported the development of this model over many years through several different grants.
James L Fastook
University of Maine
We thank the NSF, which has supported the development of this model over many years through several different grants.
BEDMAP vs AGASEA/BBAS*
Airborne Geophysical survey of the Amundsen Sea Embayment (Holt et al., 2006 & Vaughan et al., 2006)
Embedded ModelsEmbedded Models
● High-resolution, limited domain
– runs inside
● Low-resolution, larger domain model.
● Modeling the whole ice sheet allows margins to be internally generated.
– No need to specify flux or ice thickness along a boundary transecting an ice sheet.
● Specification of appropriate Boundary Conditions for limited-domain model, based on spatial and temporal interpolations of larger-domain model.
● High-resolution, limited domain
– runs inside
● Low-resolution, larger domain model.
● Modeling the whole ice sheet allows margins to be internally generated.
– No need to specify flux or ice thickness along a boundary transecting an ice sheet.
● Specification of appropriate Boundary Conditions for limited-domain model, based on spatial and temporal interpolations of larger-domain model.
Nested Grids: 16263 nodes, 40 km
Nested Grids: 9000 nodes, 10 km
Nested Grids: 10920 nodes, 5 km
Nested Grids: 6402 nodes, 5 km
Nested Grids: 9000 nodes, 10 km
Nested Grids: 10920 nodes, 5 km
Nested Grids: 6402 nodes, 5 km
Nested Grids: 10920 nodes, 5 km
Nested Grids: 6402 nodes, 5 km
Nested Grid: Summary & runtimes
Grid
Nodes
DeltaX
DeltaT
Steps
Time/step(s)
Time(hr)
A116263
40 10 4000
0.81 0.9
E1 9000
10 5 8000
0.80 1.8
F110920
5 140000
0.88 9.8
G1 6402
5 140000
0.54 6.0
Full36000
5 140000
2.9 (est) 32.0
Vostok Temperature Proxy
Area-growth and retreat
●
Volume-growth and retreat
●
Water Peak during retreat
●
Data (Rignot 2004) and Results
1
3
5
7
9
2
4
6
Data (Lang 2004) and Results
65
4
3
2
1
PIG: velocity
●
PIG: bed
●
PIG: thickness
●
PIG: water
●
PIG: velocity
●
Thwaites: velocity
●
Thwaites: bed
●
Thwaites: thickness
●
Thwaites: water
●
Thwaites: velocity
●
Growth and retreat: thickness
● See AGASEA:Thick ● Requires bandwidth, movies are large…● http://tulip.umcs.maine
• Retreat scenarios depend strongly on whether grounding-line thinning is confined to the Amundsen Sector (Case 2) or involve the Ross and Filchner-Ronne too (Case 1).
• In Case 1, retreat is much faster and more extensive, and comes in from behind the Amundsen Sea Sector.
• Case 2 looks more like the classic “weak underbelly” with retreat in Thwaites and up the PIG with a non-smooth episodic retreat punctuated by pulses of water production that seem to precede retreat steps.
• Retreat scenarios depend strongly on whether grounding-line thinning is confined to the Amundsen Sector (Case 2) or involve the Ross and Filchner-Ronne too (Case 1).
• In Case 1, retreat is much faster and more extensive, and comes in from behind the Amundsen Sea Sector.
• Case 2 looks more like the classic “weak underbelly” with retreat in Thwaites and up the PIG with a non-smooth episodic retreat punctuated by pulses of water production that seem to precede retreat steps.
Case 1: Rate
● Case 1:Rate● Requires bandwidth, movies are large…● http://tulip.umcs.maine.edu/~shamis/iweb/WAIS-
2006/Case 1%3ARate.html
Case 2: Rate
● See Case 2:Rate● Requires bandwidth, movies are large…● http://tulip.umcs.maine.edu/~shamis/iweb/WAIS-