Idealized wintertime cloud simulations as performed by meso nh
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Idealized wintertime cloud simulations as performed by Meso-NH. J.-P. Chaboureau and J.-P. Pinty Laboratoire d’Aérologie, Toulouse. IMPROVE orographic precipitation (CASE3) Cold air outbreak over the Japan Sea (CASE4). 2 bulk microphysical schemes.

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Idealized wintertime cloud simulations as performed by meso nh l.jpg
Idealized wintertime cloud simulations as performed by Meso-NH

J.-P. Chaboureau and J.-P. Pinty

Laboratoire d’Aérologie, Toulouse

  • IMPROVE orographic precipitation (CASE3)

  • Cold air outbreak over the Japan Sea (CASE4)


2 bulk microphysical schemes l.jpg
2 bulk microphysical schemes Meso-NH

5 species: cloud, rain, ice, snow, graupel

  • 1-moment (Pinty and Jabouille 1998)

    • Prognostic {rc}+{rr}+{ri}+{rs}+{rg}

    • Diagnostic {Nc}+{Nr}+{Ni}+{Ns}+{Ng}

  • 2-moment (Pinty 2002)

    • Prognostic {rc, Nc} + {rr, Nr} + CCNact(Cohard and Pinty 2000)

      {ri, Ni} + {rs} + {rg} + INnuc

    • Diagnostic {Ns} + {Ng}

      with Ns/g=Cxas deduced from Field (1999) and others


Improve set up l.jpg
IMPROVE set-up Meso-NH

  • 2D domain

    • 1-km mesh with 360 points (instead of 344)

    • 50 levels from 20 m (bottom) to 750 m (9-16 km)

  • Open boundaries/6-h run

  • Initialization with RS (ice/snow set to 0)

10 km

Relative Humidity

0


Vertical x sections after 4 h run l.jpg
Vertical X-sections after 4-h run Meso-NH

MM5

MNH 1-m

MNH 2-m

10 km

w + temp

0

cloud


Accumulated precipitation l.jpg

30 Meso-NH

Accumulated Precipitation

MNH 2-m

MM5

MNH 1-m

0

344 km

344 km

344 km

Domain-maximum mixing ratio time series

1

cloud water

snow

rain

graupel

cloud ice

6 h

0

6 h

0

6 h

0


Japan sea cloud set up l.jpg
Japan Sea cloud set-up Meso-NH

  • 2D domain

    • 2-km mesh with 512 points

    • 50 levels from 50 m (bottom) to 500 m (top)

  • 24-h run / SST forcing

  • Initialization with Japan Sea sounding

    (00 UTC 29 Jan 1993)

283 K

SST

273 K

268 K

600 m

0 m


Vertical x sections after 24 h run l.jpg
Vertical X-sections after 24-h run Meso-NH

Surface flux(H, LE)

w and 

Rel Hum %ice

240 W/m2

4 km

2 km

MNH 1-m

0 km

-60 W/m2

200

0

MNH 2-m


Vertical x sections after 24 h run8 l.jpg
Vertical X-sections after 24-h run Meso-NH

Snow

Graupel

Cloud water/ice

4 km

MNH 1-m

2 km

0 km

Ice conc/mix ratio

MNH 2-m

Cloud top varying from 1.8 km to 2.5 km (close to the coast)


Domain maximum mixing ratio time series l.jpg
Domain-maximum mixing ratio time series Meso-NH

MNH 1-m

MNH 2-m

1 g/kg

24 h

0

24 h

0

2-moment scheme: less cloud water and ice more snow


Conclusion l.jpg
Conclusion Meso-NH

  • 1-moment cloud scheme

    • Standard results

  • 2-moment cloud scheme

    • More degree of freedom

    • Need further tests


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