Mesoscale model experience with UM at met.no
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Transcript of Mesoscale model experience with UM at met.no
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Mesoscale model experience with UM at met.no
HIRLAM-ALADIN-MF miniworkshop 12/12/05Dag Bjørge
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Norwegian Meteorological Institute met.no
NWP collaboration in Europe
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Norwegian Meteorological Institute met.no
Short version of UM history at met.no
• 2002: Met Office–met.no NWP collaboration• 2003: UM 3km, S-Norway grid, forced by Met
Office 20km and Hirlam 10km• 2004: UM 4km, Norway grid, forced by HL
10km• 2005: ”UM4XL”, Norway/Sweden grid• Nov2005: UM 1km, 3 small grids nested into
UM4XL
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Norwegian Meteorological Institute met.no
How does it perform ?
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Norwegian Meteorological Institute met.no
Temperature
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Norwegian Meteorological Institute met.no
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Norwegian Meteorological Institute met.no
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Norwegian Meteorological Institute met.no
How is the UM model set up ?
• Climate and parameter files from Met Office ”ancil generation” software
• LBC’s from Hirlam 10km, interpolation with ”hl2um” ( a met.no mixture of subroutines from UM and Hirlam )
• Some surface fields from Hirlam …• Some fields from previous +12h
forecast …
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Norwegian Meteorological Institute met.no
• 300 * 500 * 38 gridpoints, • 4km resolution, 100s timestep• Hourly postprocessing of surface fields, 3
hourly pressure levels, 6 hourly model levels
• Boundary fields written out every 20 minutes for +8h to +21h, for nesting of 3 UM 1km grids
• Runs on 280 CPUs, at 00UTC and 12UTC• 48h forecast in ~1h45min• SGI Origin 3800 ( to be replaced next
year )
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Norwegian Meteorological Institute met.no
What does it look like ?
• Quasi operational runs• Different experiments• Temperature problem solved (last
week)
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Norwegian Meteorological Institute met.no
The model chain at met.no
• The ”turbulence project” is used to describe the different models we now have available for forecasting at global to local ( airport ) scale.
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Norwegian Meteorological Institute met.no
Why a turbulence project ?
”På grunn av variable og vanskelige vindforhold bestemte kapteinen seg for å avbryte landinga. Da kom det et kraftig vindkast, og flyet smalt i bakken.”
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Norwegian Meteorological Institute met.no
• Orography and resolution ( ”Seven sisters” )
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Norwegian Meteorological Institute met.no
LBCs (~50km) for Hirlam20 and Hirlam10 at 3 hour intervals ( usually 6 hours old )
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Norwegian Meteorological Institute met.no
Hirlam10
• Starts from interpolated Hirlam20-analysis
• Boundaries ( frames ) from ECMWF• Writes ”model dumps” / ”history files”
every hour for nesting of Met Office Unified Model ( UM4 )
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Norwegian Meteorological Institute met.no
Hirlam10 and UM4
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Norwegian Meteorological Institute met.no
UM 4km with three UM 1km grids
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Norwegian Meteorological Institute met.no
The ”lifetime” of LBCs in a small grid
•30min intervals
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Norwegian Meteorological Institute met.no
UM1
• Starts for all airports as soon as UM4 has reached it’s +21 hour forecast
• UM1 starts at UM4 +8h forecast, spins up for one hour
• Writes full model dumps at +9, +12, +15, +18 and +21
• The turbulence model called ”Simra” is then run for each of these instances
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Norwegian Meteorological Institute met.no
Operational cycles
• The model system as described is run twice a day at 00UTC and 12UTC
• Results are continously updated through the run, and can be studied as the forecast is produced
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Norwegian Meteorological Institute met.no
UM1, Sandnessjøen
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Norwegian Meteorological Institute met.no
Example of product, inflight cone
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Norwegian Meteorological Institute met.no
Example of product, inflight turbulence in cross section
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Norwegian Meteorological Institute met.no
Some examples of different treatment of precipitation in the different models
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Norwegian Meteorological Institute met.no
”Precipitation shaddow”, Hirlam / UM
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Norwegian Meteorological Institute met.no
Tromsø-area, Hirlam10 and UM4
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Norwegian Meteorological Institute met.no
Structure of precipitation, HL20/10, UM4, radar
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Norwegian Meteorological Institute met.no
Ad hoc setup of UM for the Barents sea
• Example showing a ”polar low”
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Norwegian Meteorological Institute met.no
Polar low in UM 4km
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Norwegian Meteorological Institute met.no
Hirlam10 og UM4
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Norwegian Meteorological Institute met.no
UM4 +23h, mslp and wind
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Norwegian Meteorological Institute met.no
Temperature problem ( solved last week )
• um505_thetamono_no.mf77 • A fix for the valley cooling problem.
It is an active area of investigation and we may come up with alternative/better solutions, but this will hopefully work in the short term.
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Norwegian Meteorological Institute met.no
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Norwegian Meteorological Institute met.no
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Norwegian Meteorological Institute met.no
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Norwegian Meteorological Institute met.no
Comparing Hirlam and UM
• Hirlam has been set up on exactly the same ( horizontal ) grid as UM4XL
• Hirlam version 6.4.1+• H04 runs started in November on the
met.no Linux cluster• Some technical difficulties …• Computer resources (SGI) : UM = 3 *
HL
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Norwegian Meteorological Institute met.no
Heavy precipitation and flooding at the western coast of Norway in November
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Norwegian Meteorological Institute met.no
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Norwegian Meteorological Institute met.no
Hirlam 4km UM 4km
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Norwegian Meteorological Institute met.no
Hirlam 4km, 12h accumulated precip
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Norwegian Meteorological Institute met.no
UM 4km, 12h accumulated precip