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THE EFFECT OF THE SURFACE CHARACTERISTICS ON THE DICE RESULTS SEEN BY THE MESONH MODEL

THE EFFECT OF THE SURFACE CHARACTERISTICS ON THE DICE RESULTS SEEN BY THE MESONH MODEL M. A. Jiménez, P. Le Moigne and J. Cuxart. DICE workshop, 14-16 October 2013, Exeter (UK). SCM: MesoNH model ( Lafore et al., 1998 )

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THE EFFECT OF THE SURFACE CHARACTERISTICS ON THE DICE RESULTS SEEN BY THE MESONH MODEL

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  1. THE EFFECT OF THE SURFACE CHARACTERISTICS ON THE DICE RESULTS SEEN BY THE MESONH MODEL M. A. Jiménez, P. Le Moigne and J. Cuxart DICE workshop, 14-16 October 2013, Exeter (UK)

  2. SCM: MesoNH model (Lafore et al., 1998) Turbulence (Cuxart et al., 2000), length scale (Bougeault and Lacarrere 1989) Radiation (ECMWF code called every time-step) Kessler microphysical scheme (vapor, cloud water and rain) Time step (300s for SCM and 20s for coupled runs) Vertical grid (Cuxart et al., 2007): 85 levels (3m resolution at lower levels, gradual stretching) LSM: SURFEX (Masson et al., 2013) ISBA 3 layers Land use: Ecoclimap at 1km resolution (Masson et al., 2003) 50% great plains crops and 50% rockies grassland total vegetation fraction over the pixel = 0.73 root depth = 1.5m and total depth = 2m leaf area index = 1.46 CLAY=0.24, SAND=0.38 from Harmonized World Soil Database (HWSD) at 1km resolution

  3. SURFACE ENERGY BUDGET (W/m2) H LE INT INT TURB RAD Steeneveld et al 2006 RN G CPL more humid (e and LWD large)

  4. TIME SERIES M10m (m/s) T2m (K) T (10m) – T (2m) Q2m (kg/kg)

  5. SCM – STAGE 1B SCM + SURFACE – STAGE 2

  6. SCM – STAGE 1B SCM + SURFACE – STAGE 2

  7. SENSITIVITY TESTS

  8. TESTING THE SURFACE SCHEME RN (W/m2) SENSIBLE HEAT FLUX (W/m2) LATENT HEAT FLUX (W/m2)

  9. TESTING THE SCM model LE RN H

  10. TESTING THE SCM model 2m temperature (K) 10m wind speed (m/s) 2m specific humidity (kg/kg)

  11. SENSITIVITY TESTS SCM CPL CPL (BARE GROUND) CPL (ROOT DEPTH) WIND SPEED (m/s) WIND SPEED (m/s) TKE (m2/s2)

  12. SENSITIVITY TESTS SCM CPL CPL (BARE GROUND) CPL (ROOT DEPTH) POT. TEMPERATURE (K) <w'T'> (Km/s)

  13. SENSITIVITY TESTS SCM CPL CPL (BARE GROUND) CPL (ROOT DEPTH) SPEC. HUMIDITY (kg/kg) <w'q'> (kg m/s)

  14. SENSITIVITY TESTS vertical resolution default: 85 levels (3m at lower levels) test: 60 levels (10m at lower levels)

  15. SENSITIVITY TESTS vertical resolution 60 levels 85 levels (DICE) potential temperature (K) wind speed (m/s)

  16. SUMMARY 1) SCM vs CPL * CPL is giving larger LE and smaller H than SCM * T colder in CPL than in SCM although there are no significant differences on the wind speed * CPL has more specific humidity than SCM 2) reducing the percentage of vegetation * LE and H become closer to observations * As a test case bare ground soil is taken but this is far from the reality... 3) reducing the root depths to a more realistic values * Improve H and LE is closer to observations than CPL or other tests * the humidity is reduced and the T2m is warmer than CPL, departing from obs * the wind speed is not largely affected 4) vertical grid mesh * importance to properly reproduce the surface layer characteristics

  17. QUESTIONS 1) Are there other surface parameters that might be interesting to check if they have realistic values? 2) Differences between models (CPL run) * surface characteristics * SCM parameterizations * which one is playing the most relevant role? 3) running all the models with the same surface parameters? Stage 1b: evaluating SCM Stage 4(?): evaluating LSM 4) ...

  18. ACKNOWLEDGEMENTS RESEARCH PROJECT CGL2012-37416-C04-01 JAE-DOC contract

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