GABLS4: an intercomparison case to study the stable boundary layer with surface interactions on the Antarctic plateau. E. Bazile (CNRM/GAME) , O. Traullé.

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Presentation transcript:

GABLS4: an intercomparison case to study the stable boundary layer with surface interactions on the Antarctic plateau. E. Bazile (CNRM/GAME) , O. Traullé (IPEV and CNRM/GAME) H. Barral (LGGE), P. Le Moigne (CNRM/GAME), C. Genthon (LGGE), V. Guidard (CNRM/GAME) , A.A.M. Holtslag (WU), G. Svensson (SU), T. Vihma (FMI) and …

Outline Motivations Why the Antarctic Plateau and DomeC ? Intercomparison case: Large scale forcing 1D (SCM) and snow scheme (LSM) LES intercomparison Acknowledgments and questions ? WWOSC 2014 Montréal

Motivations Under strongly stable stratification and depending on the parametrization used, GCM/NWP models still have an excess of mixing or strong decoupling with the surface  warm or cold bias (Holtslag et al 2013) Some NWP models use a Turbulent Kinetic Energy (TKE) scheme such as ARPEGE, AROME, WRF, DWD, but under strong stable conditions the TKE is underestimated Following Galperin et al 2007 and Zilitinkevich et al 2008 turbulence survives for Ri>>1. Study the transition and the decay of the turbulence… same behaviour with the BLLAST data (see http://bllast.sedoo.fr/) ? WWOSC 2014 Montréal

Motivations 3 previous GABLS (GEWEX Atmospheric Boundary Study) case: GABLS1 (Cuxart et al. 2006, BLM) ideal case only turbulence (Ri~0.25) Ts prescribed GABLS2 (Svensson et al 2011, BLM) diurnal cycle ( Ri ~0.2/0.4) Ts prescribed GABLS3 (Bosveld et al 2012, Ecmwf proceedings) composite case from Cabauw data : surface scheme with initial Bowen ratio (Sh/Lh) with (Ri ~0.4/0.6) GABLS4 : Stronger Ri > 1, surface interaction, easier initialization only temperature, surface fluxes, TKE observed, 2 radiosondes per day, mast data, … WWOSC 2014 Montréal

Observations: Antarctic Plateau Dome C / Concordia High frequency parameters (10 Hz) from 6 ultra-sonic anemometers : 3D Wind components and sonic temperature Low frequency parameters (30 min) : air temperature (ventilated and not ventilated), relative humidity, wind speed and direction (Young) 1 minute solar radiation components Sub and surface temperatures Radiometer HAMSTRAD (P. Ricaud) RS (1 or 2 per day) Alt=3233m 2009 41.9 m 37,51 m 32.7 m 30,15 m 25.3 m 22,79 m 17,9 m 15,43 m 8.8 m 07,03 m 3.3 m Surface T(surface) T(-1 to -10 cm) T(-10 to -30 cm) Snow and ice « American » Tower WWOSC 2014 Montréal

An homogeneous site ? LGGE tower 45m WWOSC 2014 Montréal

Temperature evolution (Mast data) 11/12/2009 dT/dz= -12°/18m ~-650K/km ! 18°C Radiosonde every 12h Case study WWOSC 2014 Montréal

Large scale forcing Dôme C Lateral boundary condition (LBC) from a 4DVAR re-analysis done with the global model ARPEGE stretched on the south pole (10km) (used and available for the Concordiasi experiment): Improvement of the snow scheme Using radiosonde at 00UTC and 12UTC (not used in the operational real time analysis in 2009) and all the levels of the sounding data Forcing terms: computed with several experiment done with a LAM at 2.5 km AROME (Seity et al, 2011) and with the ARPEGE physics at 2.5km. Two configurations: 60 vertical levels with a time step=60s (SL) and 90 vertical levels with 45s.. LAM at 2.5km WWOSC 2014 Montréal

Temperature (Kelvin) 20091211 at 00UTC 20091211 at 12UTC Rs Black line ARPEGE oper Analysis Re-Analysis Guess Re-Analysis 4DVar Analyse oper (red line) 4DVar re-analysis done with ARPEGE stretched over the Antarctic Plateau (10km) with high resolution of RS WWOSC 2014 Montréal

Wind Speed (m/s) 20091211 at 00UTC 20091211 at 12UTC Rs Black line ARPEGE oper Analysis Re-Analysis Guess Re-Analysis 4DVar Analyse oper (red line) 4DVar re-analysis done with ARPEGE stretched over the Antarctic Plateau (10km) with high resolution of RS WWOSC 2014 Montréal

GABLS4 : Stage 0  Dec 2014 For GABLS4 intercomparison, we follow the DICE experiment such as Same NetCdf file with additional output : Stage 0: LSM forced by observations (T,Rh,WS, SWd, LWd,RR) comparison of snow models during 15 days vs observed temperature profile, surface fluxes Soil initial conditions for stage 1 Observations 01/12/2009 15/12/2009 LSM 11/12/2009 00UTC WWOSC 2014 Montréal

GABLS4 :Stage 0 LSM forced by observations: T,Rh, wind at 3.3m , SWD, LWD,RR WWOSC 2014 Montréal

GABLS4 :Stage 0 Initial profile (1st Dec. 2009 at 00UTC) for the snow temperature and snow density computed with SURFEX-CROCUS scheme (Brun et al. 1992, 1989) WWOSC 2014 Montréal

GABLS4 : Stage 1  Dec 2014 For GABLS4 intercomparison, we follow the DICE experiment such as Same NetCdf file with additional output : Stage 0: LSM forced by observations (T,Rh, WS, SWd, LWd,RR) comparison of snow models during 15 days vs observed temperature profile, surface fluxes Soil initial conditions for stage 1 Observations 01/12/2009 15/12/2009 LSM 11/12/2009 00UTC Stage0 SCM +36h Stage1 LSM WWOSC 2014 Montréal

GABLS4 : Stage 1  Dec 2014 Stage 1: SCM with the LSM used in Stage 0 Date 11th December 2009 starting at 00UTC ( +36h) Initial profile coming from the RS for T and Q , the wind is initialized with the geostrophic wind. Temperature and humidity advection (hourly) Geostrophic wind (hourly) Two options: Stage 1a : use the surface and soil initial conditions from stage 0 experiment. Stage 1b: use the given surface and soil initial conditions LES are welcome SCM +36h 11/12/2009 00UTC LSM WWOSC 2014 Montréal

POTENTIAL TEMPERATURE GABLS4 : Stage1a and 1b Initial profile based on the radiosonde data but simplified (red) POTENTIAL TEMPERATURE WIND SPEED (m/s) Qv (g/Kg) WWOSC 2014 Montréal

GABLS4 : Stage1a and 1b TEMPERATURE ADVECTION (K/Day) GEOSTROPHIC WIND (m/s) WWOSC 2014 Montréal

GABLS4 : Part 2 Part2: starts the 1st January 2015 (!), results before 1st May 2015 ? Stage 2: LES and SCM same atmospheric forcing used in stage 1 but the surface temperature is prescribed. Stage 3: “ideal” or simplified GABLS4 case: no radiation, no specific humidity, constant geostrophic wind, no advection, Ts prescribed. Easier for the LES community and for other community. Stage 3 is also interesting for SCM. WWOSC 2014 Montréal

GABLS4 : very preliminary SCM output THETA +12h THETA +18h THETA +24h THETA +30h WIND SPEED +12h WIND SPEED +18h WIND SPEED +24h WIND SPEED +30h Mod1 Mod2 Mod3 Mod4 Mast temperature WWOSC 2014 Montréal

Acknowledgements The meteorological profiling observation program at Dome C which provides data for model evaluation / validation for GABLS4, is supported by IPEV (program CALVA), CNRS/INSU (program CLAPA) and OSUG (program CENACLAM). The IPY-CONCORDIASI program, supported by CNES, IPEV and CNRS, provided the rawindsonde data People responsible of the observations at DomeC and those who provided the data for the chosen period : Eric Aristidi (Laboratoire Lagrange, Université Nice Sophia Antipolis, France), Christian Lanconelli (ISAC/CNR, Italy), Ghislain Picard and Laurent Arnaud (LGGE, Grenoble, France), Andrea Pellegrini (ENEA, Italy) and Laura Ginoni. We also thanks Etienne Vignon (LGGE), William Maurel (Météo-France,CNRM/GAME), Eric Brun (Météo-France,CNRM/GAME) and not forgetting Irina Sandu (ECMWF) as a most valuable beta tester for the atmospheric forcing used in the SCM. WWOSC 2014 Montréal

www.cnrm.meteo.fr/aladin/meshtml/GABLS4/GABLS4.html WWOSC 2014 Montréal

Thank you !!! www.cnrm.meteo.fr/aladin/meshtml/GABLS4/GABLS4.html If you intend to participate please email to : eric.bazile@meteo.fr For specific questions related to: LSM: Patrick.LeMoigne@meteo.fr LES: Fleur.Couvreux@meteo.fr WWOSC 2014 Montréal

Some weaknesses for Ri >> 1 Following Galperin et al 2007 and Zilitinkevich et al 2008 turbulence survives for Ri>>1. Is it the case with “all” the turbulence scheme and with the TKE scheme ? From Zilitinkevich et al 2008 WWOSC 2014 Montréal