SIMULATION OF MAP CASE 1: Vaison-la-Romaine

MAP EPISODE

Vaison-la-Romaine Flash Flood , 20-24 septembre 1992.

TIME WINDOW

Run 50km: 920921 00UTC to 920923 12UTC
Run 10km: 920921 06UTC to 920923 12UTC

MODEL USED

MC2 v3.4.3 (Benoit et al, 1997)

PROVIDER

Robert BENOIT
Recherche en Prevision Numerique, Dorval, Canada
Robert.Benoit@ec.gc.ca

SIMULATION DOMAINS

	NW	NE	SW	SE
50km	54.37N 61.38W	54.29N 81.42E	18.99N 15.27W	18.96N 35.33E
10km	53.10N 15.61W	55.70N 22.84E	33.83N 05.68W	35.21N 17.61E

Geographic projection: Polar Stereographic true at 60 degrees north
Domain and Orography : 50km - 10km
Orography data : GLOBE dataset for the 10, US NAvy for the 50km domain
All 2 domains, 50km orography and simulation time window information.

COMPUTATIONAL GRID

Model Lid (rigid lid):	25 000 m (rigid top boundary condition)
Vertical Coordinate:	Gal-Chen Z(X,Y,z) = H * [z - h(X,Y)] / [H - h(X,Y)] Z : Gal-Chen Height z : Physical Height H : model lid h : model topography

	NI (x)	NJ (y)	NK (z)
50km	147	131	29 (list)
10km	254	254	35 (list)

INITIAL AND NESTING FIELDS

50 km Run:	ECMWF Uninitialized Analysis (directly in terrain following coordinate)
10 km Run:	Model is self-nested in the 50 km Run

ACTIVATED PHYSICAL PARAMETERIZATION

Common to all resolutions:

Radiation : IR Garand (1983, Garand et Mailhot 1990); Solar: Fouquart-Bonnel (1980)
Surface boundary layer : Force-restore method (Deardorff 1978; Benoit et al 1989)
Turbulence and Vertical diffusion :Turbulent Kinetic Energy (Benoit et al 1989)
Horizontal diffusion : Second order (KH *del^2)
Top absorbing layer : Nesting of the pronostic variables (top 1/3 of the domain)
Orography treatment : Filtered over 4 grid points
Subgrid scale orography : Effective Z0 computed following Georgelin (1994)

Specific to each resolution:

	50km	10km
Large scale precip.	Kessler	Kessler
Convective precip.	Kuo	FCP
Gavity wave drag (McFarlane 1987)	yes	yes
Horizontal Diffusion Coefficient KH [m2/s]	25000.	3000.

Kessler : Explicit cloud and rain water prediction based on Kessler (1969)
Kong & Yau: Microphysic Scheme described in Kong and Yau 1996 (Atmos.-Ocean, May 1996)
Kuo: Kuo Convection Scheme (Kuo 1974) similar to the version used at ECMWF (1984)
FCP : Fritsch-Chappell scheme (1980) as modified by Zhang and Fritsch (1986)

AVAILABLE FIELDS

The diagnostic quantities HR (Relative humidity), PV (Potential vorticity) and TH (Potential temperature) are computed with home made routines and so is GZ (Geopotential Height).
The graphics are made using the displaying tool GI_MAP available at MDC.
The symbols used in the table are as follow:

PR:	Total Precipitation Accumulation (3h or 24h, the date mark the beginning of the period) [mm]
SN:	Convective Precipitation Accumulation (3h or 24h, the date mark the beginning of the period) [mm]
PN:	Mean Sea Level Pressure [hPa]
GZ:	Geopotential Height [dm]
UV:	Wind, Horizontal Component [m/s]
WZ:	Wind, Vertical Component [m/s]
TH:	Potential Temperature [K]
HR:	Relative Humidity [%]
PV:	Potential Vorticity [PVU]

For further information please contact Robert Benoit or Stephane Chamberland.

REM: The 50km figures are not available. Info about this run have been included as a reference for the self nesting procedure.

List of available field :

Run	Field	Level	Dates
10km	PR3, SN3	Surface	092192 06 UTC to 092392 09 UTC (every 3h)
	PR24h, SN24	Surface	092192 06 UTC and 092292 06 UTC
	PN, UV	Surface	092192 06 UTC to 092392 12 UTC (every 3h)
	GZ, UV, WZ, TH, HR	300 mb 500 mb 850 mb	092192 06 UTC to 092392 12 UTC (every 3h)
	PV	850 mb 310 K 315 K	092192 06 UTC to 092392 12 UTC (every 3h)

Notes on the Graphics:

high resolution (700x700), in compressed archive file (.tar.gz),
low resolution (500x500); this second set is made available in order to be able to look at figure individually and interactively (see below).

Download hi-resolution figures:

	Surface	850 mb	500 mb	300 mb	310 K	315 K
PR	520 Kb
SN	493 Kb
PN	1547 Kb
GZ		462 Kb	491 Kb	466 Kb
UV	994 Kb	935 Kb	819 Kb	920 Kb
WZ		886 Kb	805 Kb	751 Kb
TH		534 Kb	471 Kb	462 Kb
HR		992 Kb	747 Kb	683 Kb
PV		977 Kb			783 Kb	858 Kb

table entries indicate the file size
Look at low resolution figures:
(Use SAVE IMAGE AS option to download the image)

To change the figure above, select relevant options then press the corresponding show button.

REFERENCES

Benoit, R., J. Cote and J. Mailhot, 1989: Inclusion of a TKE boundary layer parameterization in the Canadian regional finit-element model. Mon. Wea. Rev., 117, 1726-1750.

Benoit, R., M. Desgagne, P. Pellerin, S. Pellerin, Y. Chartier and S. Desjardins, 1997: The canadian MC2: A semi-lagrangian, semi-implicit wide-band atmospheric model suited for fine-scale process studies and simulation. Mon. Wea. Rev., Vol 125 (in press).

Deardorff, J.W., 1976: Efficient prediction of grounds surface temperature and moisture with inclusion of a layer of vegetation. J.Geophy. Res., 83, 1889-1903.

Fouquart, Y. and B. Bonnel, 1980: Computation of solar heating of the eart's atmosphere: a new parameterisation. Contrib. Atmos. Phys., 53, 35-63.

Garand, L., 1983: Some improvement and comlements of the infrared emissivity algorithm including a parameterization of the absorption in the continuum region. J. Atmos. Sci., 40, 230-244.

Garand, L. and J. Mailhot, 1990: The influence of the infrared radiation on numerical weather forecasts. Proceedings of the Seventh Conference on Atmospheric Radiation, 23-27 July 1990, San Francisco, U.S.A., Amer. Meteor. Soc., J146-J151.

Georgelin, M., E. Richard, M. Petitdidier and A. Druilhet, 1994: Impact of subgrid-scale orography parameterization on the simulation of orographic flows. Mon. Wea. Rev., 122, 1509-1522.

Kessler, E., 1969: On the distribution and continuity of water substance in atmospheric circulation. Meteor. Monogr., 10, No. 32, Amer. Meteor. Soc., 84 pp.

Kong F. and K. Yau, 1997: An Explicit Approach of Microphysics in MC2. Submitted to Atmos.-Ocean.

Kuo, H. L., 1974: Further studies on the parameterization of the influence of cumulus convection on large-scale flow. J. Atmos. Sci., 31, 1232-1240.

McFarlane, N.A., 1987: The efect of orographically excited gravity wave drag on the general circulation of the lower stratosphere and troposphere. J. Atmos. Sci., 44, 1775-1800.

Type of field:		Level:
10 km: