Danish Meteorological Institute [1]

Transcription

1 Validation of different approaches to forecast near surface cloud water in NWP models M. Masbou, A. Bott, H. Petithomme, C. Petersen [], N.W. Nielsen, H. Seidl, A. Kann, M.D.Muller, J. Cermak, W.K.Adam [] Danish Meteorological Institute Toulouse, France

2 Motivation COST722: Comparison of 4 European High Resolution Fog Models Statistical comparison was done for a 4 months period for Lindenberg, Germany The models were compared in more details on 3 cases Toulouse, France

3 Models. Non-hydrostatic, non operational, high vertical/horizontal resolution, complex microphysics. LM-PAFOG (Germany) 2. NMM-PAFOG (Switzerland) 2. Statistical model. MOS-ARGEGE (France) 3. Hydrostatic, operational, lower vertical/horizontal resolution, ad hoc treatment of cloud water near the surface. DMI-HIRLAM (Denmark) 2. -AUSTRIA (Austria) Toulouse, France

4 Location of Lindenberg site Toulouse, France

5 Case : Fog episode with partial cloud cover. 27 September 25 in the morning Toulouse, France

6 Observed visibility and derived cloud type Toulouse, France

7 .2 VISIB in m VI in m a) b) VISFIELD in m m.2.2 VISI in m m

8 .2 QC in g/kg m QC in g/kg QCFIELD in g/kg m QC in g/kg m

9 Vertical profile at Lindenberg BLACK:OBSERVED RED: HIRLAM GREEN: CYAN:NMM-PAFOG BLUE:LM-PAFOG 2 Temperature Relative Humidity Height in m Height in m Temperature in Celsius Toulouse, France Relative Humidity in %

10 SW Flux in W/m SW Fluxes UTC a) b) Sensible Fluxes OO UTC Sensible Flux in W/m2 5 5 LW Flux in W/m2 Latent Flux in W/m LW Fluxes UTC 5 Latent Fluxes UTC

11 TEMPERATURE in Celsius TEMPERATURE 2m UTC 5 a) b) SURFACE TEMPERATURE UTC TEMPERATURE in Celsius RELATIVE HUMIDITY in % WIND in m/s RELATIVE HUMIDITY 2m UTC WIND m UTC

12 Case 2: Fog episode without cloud cover. 7 October 25 in the morning Toulouse, France

13 Observed visibility and derived cloud type Toulouse, France

14 .2 VISIB in m VI in m a) b) VISFIELD in m m.2.2 VISI in m m

15 .2 QC in g/kg m QC in g/kg a) b) QCFIELD in g/kg m QC in g/kg m

16 Vertical profile at Lindenberg BLACK:OBSERVED RED: HIRLAM GREEN: CYAN:NMM-PAFOG BLUE:LM-PAFOG 2 Relative Humidity Temperature Height in m Height in m Relative Humidity in % Toulouse, France Temperature in Celsius

17 SW Flux in W/m2 Latent Flux in W/m SW Fluxes 625 UTC a) b) Latent Fluxes 625 UTC LW Flux in W/m2 Sensible Flux in W/m2 5 LW Fluxes 625 UTC 5 2 Sensible Fluxes 625 OO UTC 4 3 2

18 TEMPERATURE in Celsius TEMPERATURE 2m 625 UTC 5 a) b) SURFACE TEMPERATURE 625 UTC TEMPERATURE in Celsius RELATIVE HUMIDITY in % WIND in m/s RELATIVE HUMIDITY 2m 625 UTC WIND m 625 UTC

19 Case 3: Reduced visibility with stratiform low clouds. 7 December 25 Toulouse, France

20 Observed visibility and derived cloud type Toulouse, France

21 .2 VISIB in m VI in m a) b) VISFIELD in m m.2.2 VISI in m m

22 .2 QC in g/kg m QC in g/kg a) b) QCFIELD in g/kg m QC in g/kg m

23 .2 QC in g/kg m QC in g/kg a) b) QCFIELD in g/kg m QC in g/kg m

24 Vertical profile at Lindenberg BLACK:OBSERVED RED: HIRLAM GREEN: CYAN:NMM-PAFOG BLUE:LM-PAFOG 2 Temperature Relative humidity Height in m Height in m Temperature in Celsius Toulouse, France Relative Humidity in %

25 SW Flux in W/m SW Fluxes 6225 UTC a) b) Latent Fluxes 6225 UTC Latent Flux in W/m2 25 LW Flux in W/m2 Sensible Flux in W/m2 5 LW Fluxes 6225 UTC 5 75 Sensible Fluxes 6225 UTC

26 TEMPERATURE in Celsius 5 TEMPERATURE 2m 6225 UTC 5 a) b) SURFACE TEMPERATURE 6225 UTC TEMPERATURE in Celsius 5 RELATIVE HUMIDITY in % WIND in m/s 9 RELATIVE HUMIDITY 2m 6225 UTC 8 7 WIND m 6225 UTC

27 Conclusions Initialization and data-assimilation of cloud water, near surface profiles and surface temperature/soil water are almost not existing or sufficient Condensation, convection, vertical diffusion schemes are usually not designed to work well near the surface Toulouse, France

28 References COST722 HOMEPAGE QUESTIONS? Toulouse, France