Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
High pressure weatherSystem over the Alps for nearly three weeksin Sept. 1999
Sep.9. 00 UTC 500hPa geopotentialand surface pressure
Diurnal Mountain Winds
H
Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
Time series of horizontal wind vector
Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
Time series of virtual temperature and meridional wind component
-8
-4
0
4
0 0 time [UTC]
291
295
299
12 0
9/8 9/9 9/10 9/11 9/12 9/13 9/14/1999
640m
640m
1360m
12 12 12 12 120 0 0 0
up
valle
yd
ow
nva
lley
Tvi
r[K
]v
[m/s
]
N
S
Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
-0,5
3 6 9 12 15 18 21 Zeit in UTC
-7,5
-6,5
-5,5
-4,5
-3,5
-2,5
-1,5
-0,5
0,5
1,5
2,5
3,5
4,5
100
500
1000
Bergwind
Talwind
N-S
Win
d-K
om
ponen
te(m
/s)
Ho
ehe
ueb
erG
r.(m
)
Berg-wind
N / S wind component – mean of Sep. 8. – 14.
S R S S
SouthNorth
South
Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
MM5 Modell
4 Modell domains Δx, Δ y = 27km, 9km, 3km, 1km
39 sigma height levels 15m agl – 100hPa
42h simulation run 12 UTC 11. Sept. – 06 UTC 13. Sept.
Physical processes parameterized:
- Radiation RRTM scheme (Mlawer)
-boundary layer processes (Gayno Seaman scheme)
cloud microphysics simple scheme (Dudheim)
cumulus parameterization in outer domain (Zängl)
Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
Pot. Temperature 12. Sep.
400
600
800
1.000
1.200
1.400
0 3 6 9 12 15 18
292
294
294
296
298
Time [UTC]
He
igh
t[m
]as
l
400
600
800
1.000
1.200
1.400
0 3 6 9 12 15 18
290
Time [UTC]
292
294
296
298
292
WTR Measurements NN5 Simulation
Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
Time series of pot. Temperature in the Rhine Valley
Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
N - S wind component Sep. 12.
WTR Measurements NN5 Simulation
Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
Pot. Temperature @ 10m agl Sept. 12 6UTC 16UTC
W
V
D
F
Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
Wind field at 180m AGL and vertical cross section of temperature and wind on 12. Sep 06 UTC
Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft
Wind field at 180m AGL and vertical cross section of temperature and wind on 12. Sep 16 UTC