SIMULATION OF MAP CASE 2: BRIG

MAP EPISODE

Brig Flash Flood , 21-26 septembre 1993.

TIME WINDOW

Run 50km: 930921 12UTC to 930926 00UTC
Run 10km: 930922 12UTC to 930925 18UTC
Run 2km: 930923 00UTC to 930925 14UTC

MODEL USED

MC2 v3.2 (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	52.61N 10.96W	54.26N 21.45E	35.46N 03.58W	36.40N 17.28E
2km	47.55N 05.03E	47.69N 10.50E	43.92N 05.46E	44.05N 10.45E

Geographic projection: Polar Stereographic true at 60 degrees north
Domain and Orography : 50km - 10km - 2km
Orography data : GLOBE dataset for the 10 and 2 km domains, US NAvy for the 50km domain
All 3 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	25 (list)
10km	221	221	25 (list)
2km	221	221	25 (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
2 km Run:	Model is self-nested in the 10 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	2km
Large scale precip.	Kessler	Kessler	Kessler or Kong & Yau
Convective precip.	Kuo	FCP	none
Gavity wave drag (McFarlane 1987)	yes	yes	none
Horizontal Diffusion Coefficient KH [m2/s]	12500.	2000.	1440.

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 Filed Level Dates

10km PR3, SN3 Surface 092293 12 UTC to 092593 15 UTC (every 3h)

PR24h, SN24 Surface 092393 06 UTC and 092493 06 UTC

PN, UV Surface 092293 12 UTC to 092593 18 UTC (every 3h)

GZ, UV, WZ,
TH, HR 300 mb
500 mb
850 mb 092293 12 UTC to 092593 18 UTC (every 3h)

PV 850 mb
310 K
315 K 092293 12 UTC to 092593 18 UTC (every 3h)

2km Kessler &
2km Kong&Yau PR (3h) Surface 930923 15 UTC to 930925 03 UTC (every 3h)

PR (24h) Surface 930924 06 UTC

PN, UV Surface 930923 15 UTC to 930925 06 UTC (every 3h)

GZ, UV, WZ,
TH, HR 300 mb
500 mb
850 mb 930923 15 UTC to 930925 06 UTC (every 3h)

PV 850 mb
310 K
315 K 930923 15 UTC to 930925 06 UTC (every 3h)

Notes on the Graphics:

Two sets of figures have been produced:

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:

	092293	092393	092493	092593
10 km	download (3674K)	download (7887K)	download (7593K)	download (6378K)
2 km Kessler	unavailable	download (3103K)	download (6399K)	download (2170K)
2 km Kong&Yau	unavailable	download (3150K)	download (6554K)	download (2182K)

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.

Type of field:		Level:
10 km:
02 km:

How to read the informations on the figure

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.

Run	Filed	Level	Dates
10km	PR3, SN3	Surface	092293 12 UTC to 092593 15 UTC (every 3h)
	PR24h, SN24	Surface	092393 06 UTC and 092493 06 UTC
	PN, UV	Surface	092293 12 UTC to 092593 18 UTC (every 3h)
	GZ, UV, WZ, TH, HR	300 mb 500 mb 850 mb	092293 12 UTC to 092593 18 UTC (every 3h)
	PV	850 mb 310 K 315 K	092293 12 UTC to 092593 18 UTC (every 3h)
2km Kessler & 2km Kong&Yau	PR (3h)	Surface	930923 15 UTC to 930925 03 UTC (every 3h)
	PR (24h)	Surface	930924 06 UTC
	PN, UV	Surface	930923 15 UTC to 930925 06 UTC (every 3h)
	GZ, UV, WZ, TH, HR	300 mb 500 mb 850 mb	930923 15 UTC to 930925 06 UTC (every 3h)
	PV	850 mb 310 K 315 K	930923 15 UTC to 930925 06 UTC (every 3h)