Preliminary Evaluations of the Navy's ACNFS versus NASA IceBridge Data David Hebert 1, Richard Allard 1, Pamela Posey 1, Alan Wallcraft 1, Joseph Metzger.

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Presentation transcript:

Preliminary Evaluations of the Navy's ACNFS versus NASA IceBridge Data David Hebert 1, Richard Allard 1, Pamela Posey 1, Alan Wallcraft 1, Joseph Metzger 1, Ole Martin Smedstad 2, Michael Phelps 3, Sinead Farrell 4 1 Naval Research Lab, Oceanography Division, Stennis Space Center 2 QinetiQ North America, Stennis Space Center 3 Jacobs Engineering, Stennis Space Center 4 ESSIC/CICS/University of Maryland 24 OCT th AOMIP/ 1 st FAMOS meeting

ACNFS 24 OCT th AOMIP/ 1 st FAMOS meeting Domain: o N High resolution: 3.5 km at pole Assimilation of ocean and ice 5 day forecast daily ACNFS consists of : - Ice Model - CICE - Ocean Model - HYCOM - Data assimilation - NCODA - Forced with 0.5 o NOGAPS OPTEST completed

CICE Standalone Same horizontal grid as ACNFS “Standalone” no HYCOM – no assimilation Ocean data (T, S, U, V) from daily ACNFS output Atmospheric forcing from NOGAPS except for precipitation. Several precip runs done here: 1.Climatology (Standard ACNFS) 2.NOGAPS precipitation 3.Zero precipitation Initialized from ACNFS March 14, Run through April 02, OCT th AOMIP/ 1 st FAMOS meeting

IceBridge Tracks Spring OCT th AOMIP/ 1 st FAMOS meeting Sea Ice Thickness Snow Thickness Surface Temperature

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Results 24 OCT th AOMIP/ 1 st FAMOS meeting

Summary ACNFS and CICE Stand Alone compared with Ice Bridge sea ice thickness, snow depth, surface temperature Compared to Ice Bridge: – Modeled Ice Thickness generally 1-2 m too thick – Modeled Snow Depth generally cm too deep – Surface Temp ± 5⁰C, follows Ice Bridge pattern Longer runs needed to see differences due to precipitation 1716 th AOMIP/ 1 st FAMOS meeting24 OCT 2012

What’s next? Precipitation comparisons – Climatology vs. NOGAPS – Different snow, different albedo (Melt ponds?) Assimilation – Will change in observed snow depth help forecast? – Thermodynamics? – Surface temp impact on modeled ice thickness 1816 th AOMIP/ 1 st FAMOS meeting24 OCT 2012