Numerical Modeling of ocean circulation over the continental shelf and beneath the ice shelves in the Amundsen Sea, Antarctica WAIS September 28, 2006.

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Presentation transcript:

Numerical Modeling of ocean circulation over the continental shelf and beneath the ice shelves in the Amundsen Sea, Antarctica WAIS September 28, 2006

Courant Institute of Mathematical Sciences New York University New York, U.S.A. David Holland Adrian Jenkins British Antarctic Survey Natural Environment Research Council Cambridge, U.K. Stan Jacobs Lamont-Doherty Earth Observatory, Columbia University New York, U.S.A.

Supported by

Continental Shelf, Amundsen Sea

Ice Shelves, Amundsen Sea

Outline 1.Ice Pump 2.POLAIR 3.Model Domain 4.Sea-Ice Simulation 5.CDW Pathways 6.Melt Rates 7.Tides 8.Heat Budget 9.Sensitivity CDW

1 Ice Pump Pressure-Dependent Freezing-Point

Polar Ocean Land Atmosphere Ice Regional (POLAIR) Model(l)ing System 2 POLAIR Schematic

2 POLAIR Components Isopycnic-ocean modification/combination of MICOM/Higdon Thermodynamic-dynamic sea-ice icepycnic & cavitating fluid Thermodynamic ice-shelf viscous-sublayer Forced by daily wind & air temperature (NCEP) Applied to Amundsen Sea and Ice Shelves

2 POLAIR Hardware/Software

3 Model Domain Geographic Orientation Red box - full model domain Yellow Box- sub model domain (for most of analysis)

3 Model Domain BEDMAP Bathymetry

3 Model Domain Updated Bathymetry Nitsche & Jacobs LDEO (in prep.)

3 Model Domain Bathymetry

3 Model Domain Ice Shelf Thickness

4 Sea-Ice - Concentration (& Velocity) Black-Hatched is Land (i.e., Grounded Ice) Lite-Blue- Hatched is Ice Shelf (i.e., Floating Ice) Vector Arrows are sea-ice motion Color is Sea-Ice Concentration (red is lots; blue is little) Grey- Hatched is open-ocean surface (i.e., no sea ice)

5 CDW Pathways Depth 0000 m Lite-Blue- Hatched is Ice Shelf (i.e., Floating Ice) Black-Hatched is Land (i.e., Grounded Ice) Color is Ocean Temperature (red is warm; blue is cold) Vector Arrows are ocean motion

5 CDW Pathways Depth 0100 m

5 CDW Pathways Depth 0200 m

5 CDW Pathways Depth 0300 m

5 CDW Pathways Depth 0400 m

5 CDW Pathways Depth 0500 m

6 Melt Rate Year 5; Big Domain

6 Melt Rate Model Equilibration Y0 to Y10 Large Interseasonal Variability

7 Tides Variation of Sea-Surface Height Cyclonic Coastal Kelvin Wave

7 Tides Basal Melt Rate (Tidal Forcing OFF) Annual Mean Basal Melt Rate is 66 cm/a

7 Tides Basal Melt Rate (Tidal Forcing ON) Annual Mean Basal Melt Rate is 83 cm/a 25% Increase

8 Heat Budget Continental Shelf Area Mask

8 Heat Budget Ice Shelf Cavity Mask

Land Continental Shelf CDW 8 Heat Budget Tally 62 TW60 TW1 TW 41 TW40 TW

9 Sensitivity CDW CDW Amount

9 Sensitivity CDW CDW Temperature

Next Activities Coriolis Table (Grenoble)

Small fraction (~5%) available ocean heat used for melting Conclusions Linear increase in melt rate with increase in CDW amount Non-linear increase in melt rate with increase in CDW temperature