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
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
2 bulk microphysical schemes

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
IMPROVE set-up
  • 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
Vertical X-sections after 4-h run

MM5

MNH 1-m

MNH 2-m

10 km

w + temp

0

cloud

accumulated precipitation

30

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
Japan Sea cloud set-up
  • 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
Vertical X-sections after 24-h run

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
Vertical X-sections after 24-h run

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
Domain-maximum mixing ratio time series

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
Conclusion
  • 1-moment cloud scheme
    • Standard results
  • 2-moment cloud scheme
    • More degree of freedom
    • Need further tests
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