1. CESM/RACM/RASM Update May 15, 2012

2. Since Nov, 2011 ccsm4_0_racm28:racm29:racm30 – vic parallelization – vic netcdf files – vic coupling mods and “273.15” fixes – wrf update to remove u* averaging – new datm forcing for pop/cice “H” cases – update racm utilities (post-processing tools)

3. RACM Component Model Performance racm29+, parallel vic, wr50a_ar9v4, raptor, out-of-box I/O, 10 day tests, no restarts sec/model_day processors 1 10 100 1000

4. CCSM pe layouts For science, surface fluxes must be computed with latest atm state. So land (in land), sea ice (in ice), and ocean flux calculation (in coupler) must be run sequentially with the atm model. land ice ocean atm coupler land ice ocean atm coupler land ice ocean atm coupler sequential hybrid concurrent hybrid concurrent “2”

5. RACM Throughput total pesthroughput (model years / wall day) cost (pe- hrs/model year) atm pes lnd pes ice pes ocn pes layout 2560.30*202002561 seq 3360.54149002721625664hyb conc 4320.66158003361632096hyb conc 5120.711740051216512 seq 6560.831980052816512128hyb conc 10400.9725700656161024384hyb conc2 * old setup with faster cice

6. Ongoing RASM Work RACM version – Continued scientific validation – vic exact restart testing RASM version of the model based on CESM1.1 – New features Supports gregorian calendar Updated vector mapping over pole Other features like pio – WRF/CLM “PK, PF” cases running – WRF/VIC/POP/CICE wr50a_ar9v4 “RB” next then datm/pop/cice “H” WRF/CLM/? CISM configurations? runoff? – Testing and validation

7. NCAR/CESM1.1 update target CESM1.1 version due out late-2011 or mid-2012 late 2012 WRF now part of CESM1.1 development version for internal NCAR testing (wrf will NOT be part of CESM1.1 community release) WRF coupling in CESM validation continues within NCAR Runoff may become separate component in summer 2012 Still need to address – CESM vs WRF repositories/compatability/relationship – WRF integration in CESM (build, namelist generation, I/O unit numbers, file name convention, restart validation, limitiations on input file streaming, etc)

9. Performance time in seconds/model day (vic on 1 pe) Limited by vic running on 1 pe, should be solved soon. Next slowest component is wrf. – time steps are expensive – scaling fine to about O(100) gridcells/pe, that’s O(500) pes for wr50a resolution – standard weather case are run O(days), we want to run O(years) pop and cice scaling not currently an issue. peswrfvicpopcicecpl 6455033528821522 12830733211410411 25619033456546 51213733229273

10. Overview of RACM version based on CCSM4.0 (released April 2010) – add wrf as atm component – add vic as lnd component – extend pop/cice to allow distinct coupling grid – coupling non-identical regional grids – no changes to coupling fields relative to ccsm4 lives in NPS repository raptor, garnet, chugach primary compute platforms other users wrf coupling being reviewed at NCAR

11. RACM Configurations Compsets – H = datm, slnd, pop, cice – RB = wrf, vic, pop, cice – RI = datm, vic, socn, sice – RJ = wrf, dlnd, pop, cice – RK = wrf, vic, docn, dice – RL = wrf, dlnd, docn, dice Grids – wr50a, w5a = wrf 50 km grid (205x275) – ar9v3, a93 = ocean/ice RACM 9 km grid (1280x720) – ar9v4, a94 = extended ocn/ice RACM grid (1560x1080)

12. RACM Regional Non-Uniform Grids pop/cice extended region values specified from observations, set inside pop and cice at top level coupling interface 3 regions blue: standard atm/ocn 2-way coupling pink: atm + extended ocean (atm needs forcing, ocean does not forcing but it exists) purple: no atm + extended ocn (coupling unimportant) pop/cice (extended) wrf/vic pop/cice