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ARSC/IARC Report DOD/RACM Workshop, December 12-13 2009 Juanxiong He 1,2 Greg Newby 1 1. Arctic Region Supercomputing Center 2. International Arctic Research Center
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The regional WRF coupling with regional POP2, regional CICE and dlnd Setting: WRF(wr50a, 276x206x35, 50km, dt=150s, CAM/Monin- Obukhov/YSU/Kain-Fritsch, Specified boundary condition) POP2/CICE (ar9v2, 1380x1080x45, ~9km, dt=6min) coupling every 30 minutes Cold start at 2003-01-01_00:00:00 Length > 5 months
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Cold feedback Parallel bug Import climatology SST into the extended grid Solve the cold feedback
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initial status – first test seaice at 2003-01- 01_00:00:00 surface skin temperature at 2003-01-01_00:00:00 Constant SST
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severe cold feedback sea ice at 2003-02- 01_00:00:00 surface skin temperature at 2003-02-01_00:00:00
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Fix the parallel bug The bug: mpi_cart_create in the WRF returns two new communicators. According the MPI standard, shall only one new communicator be generated. Test the program on the pingo and with the other MPI libraries such as openmpi-1.2.6 and mpich2-1.0.7, the error still exists. It confirms the error lies in the WRF. The bug distorts the simulation especially over the boundary. Move the processors division function from module_dm.F to seq_comm_mct.F90
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Parallel - Distort the simulation discontinuity
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After the correction Coupling Standard WRF
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Unreasonable latent heat near the lateral boundary
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u
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v
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Solve the severe cold feedback problem The integration order of the physical schemes contributes it. Readjust the integration order of the physical schemes Replace constant SST in the extended grid with the climatology SST
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The integration order of the physical schemes Surface layer Radiation Pbl The previouseThe adjustment Surface layer Pbl Radiatio n
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initial status – second test seaice at 2003-01- 01_00:00:00 surface skin temperature at 2003-01-01_00:00:00 discontinuity
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Seaice – after one month integration seaice of the coupling at 2003-02-01_00:00:00 Seaice from reanalysis and interpolated by pure WRF initialization at 2003-02-01_00:00:00 excess
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Seaice – after two months integration seaice at 2003-03- 01_00:00:00 Seaice from reanalysis and interpolated by pure WRF initialization at 2003-03-01_00:00:00 growth
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Seaice – after three months integration seaice at 2003-04- 01_00:00:00 Seaice from reanalysis and interpolated by pure WRF initialization at 2003-04-01_00:00:00 decrease
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Seaice – after four months integration seaice at 2003-05- 01_00:00:00 Seaice from reanalysis and interpolated by pure WRF initialization at 2003-05-01_00:00:00 Shrink
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Surface skin temperature - second test surface skin temperature at 2003-05-01_00:00:00 surface skin temperature at 2003-02-01_00:00:00 discontinuity dlnd seems unchanged
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Sea level pressure - snapshot slp at 2003-05- 01_00:00:00 slp at 2003-02- 01_00:00:00
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Parallel computation Very slow in a very small cpu resources WRF - 1d/24m/64p, 1d/12m/128p, 1d/7m/256p POP2 - 1d/17m/64p, 1d/10m/128p, 1d/7m/256p CICE - 1d/8m/64p, 1d/5m/128p, 1d/3m/256p CPL - 1d/3m/64p, 1d/1m/128p, 1d/<1m/256p RACM - 1d/52m/64p, 1d/28m/128p, 1d/17m/256p Concurrency/fully sequential The fully sequential – 1d/28m/128p concurrency – 1d/33m/128p competitions among the communication, the acceleration and the concurrency A very small cpu resources, need to scale up more than 1024 processors
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Next WRF, VIC, POP2 and CICE fully regional coupling, well tune and plan productive run carefully Optimization and Scale up to more than 1024 processors
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Thank you!
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