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C. Flamant (1), C. Champollion (1,2), S. Bastin (1) and E. Richard (3) (1) Institut Pierre-Simon Laplace, UPMC/CNRS/UVSQ (2) Géosciences Montpellier UM2/CNRS,

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Presentation on theme: "C. Flamant (1), C. Champollion (1,2), S. Bastin (1) and E. Richard (3) (1) Institut Pierre-Simon Laplace, UPMC/CNRS/UVSQ (2) Géosciences Montpellier UM2/CNRS,"— Presentation transcript:

1 C. Flamant (1), C. Champollion (1,2), S. Bastin (1) and E. Richard (3) (1) Institut Pierre-Simon Laplace, UPMC/CNRS/UVSQ (2) Géosciences Montpellier UM2/CNRS, (3) Laboratoire d'Aérologie OMP/CNRS Water vapour variability in the Rhine Valley and its role on convective initiation: first results from LEANDRE 2 COPS workshop February 2008, University of Hohenheim

2 Objectives understand the role of mesoscale dynamics processes on the water vapour variability in the Rhine Valley, and particularly on the formation of dry layers and lids above the Atmospheric Boundary Layer (ABL), LEANDRE 2 01/08/08 around 0810 UTC

3 Objectives understand the role of mesoscale dynamics processes on the water vapour variability in the Rhine Valley, and particularly on the formation of dry layers and lids above the Atmospheric Boundary Layer (ABL), comprehend the relative importance soil moisture, surface heterogeneities, and orography on the ABL water vapour variability, assess the impact of mesoscale water vapour variability on convection initiation (CI), and the role of dry layers & lids on CI or convection inhibition, demonstrate the potential of airborne lidar-derived water vapor measurements for improving CI in mesoscale models through 4D assimilation, contribute to the water vapour profiling instruments intercomparison.

4 Tools & strategy Systematic sampling of water vapour in the Rhine Valley (incl. the Vosges and the Black Forest) using the airborne DIAL LEANDRE 2, prior to CI events, implementation of supersites with dedicated profiling systems, Mesoscale simulations (control and sensitivity analyses), lidar-derived water vapour mixing ratio profiles assimilation experiments (using AROME).

5 LEANDRE 2 IOP 8b (15/07) High-pressure convection 2 flights: UTC 1141 – 1457 UTC LEANDRE 2 IOP 9c (20/07) Forced convection 1 flight:0657 – 0918 UTC LEANDRE 2 IOP 13a (01/08) High-pressure convection 2 flights: 0808 – 1106 UTC 1344 – 1643 UTC Systematic sampling of water vapour in the Rhine Valley using the airborne DIAL LEANDRE 2, prior to CI events: Data Water vapour mixing ratio Horizontal resolution ~3 km Vertical resolution ~300 m Atmospheric reflectivity Horizontal resolution ~3 km Vertical resolution ~300 m

6 IOP 8b (15/07) High-pressure convection Meso-NH 1000 m Winds & wvmr

7 IOP 8b (15/07) High-pressure convection Meso-NH 1000 m Winds & wvmr

8 D1  D5B1  B5 Time C1  C5 CI West of VosgesVosgesRhine Valley

9 Latitude Time B4  D4  G4 North / Supersite R B3  D3  G3 Supersite V B1  D1  G1 South / Burnhaupt

10 G4  B4: UTC IOP 9c (20/07) Forced convection B3  G3: UTC

11 G2  B2: UTC IOP 9c (20/07) Forced convection G1  D1: UTC

12 Meso-NH 2000 m Winds & wvmr Meso-NH 1000 m Winds & wvmr IOP 13a (01/08) High-pressure convection

13 Meso-NH 2000 m Winds & wvmr IOP 13a (01/08) High-pressure convection Meso-NH 1000 m Winds & wvmr

14 Time B4  G4 North / Supersite R B3  G3 Supersite V B2  G2 Latitude dust

15 E1  E5 Time C1  C5 VosgesBlack Forest D1  D5 Rhine Valley Saharan air mass

16 Conclusions and perspectives great LEANDRE 2 dataset, we should be able to complete our initial objectives !! LEANDRE 2 dataset quality currently being assessed by Paolo’s group  (bias & RMS deviation, see Rohini’s talk), data available right now!!! 15 July & 1 August  day long evolution, 15 & 20 July  pre-CI observations in the Rhine Valley. design mesoscale simulations 15 & 20 July, 1 August cases and sensitivity experiments, liaise with other experimental groups, conduct 4D-VAR assimilation experiments of airborne lidar- derived water vapour measurements, contribute to the IASI water vapour profiling validation.

17 Data from: IOP 8b (15/07): LEANDRE 2, RDS in Hornisgrinde & IASI IOP 13a (01/08): LEANDRE 2, dropsondes, RDS in Hornisgrinde & IASI First comparison of IASI water vapor mixing ratio profiles with airborne DIAL LEANDRE 2, dropsondes and radiosondes observations over the Black Forest region during COPS C. Flamant, H. Herbin, C. Champollion

18 LEANDRE 2 IOP 8b (15/07) G4  B4: UTC Intercomparison region: Hornisgrinde (Black Forest) Hornisgrinde DIAL LEANDRE 2 Profil IASI: 0905 UTC RDS: 0800 UTC


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