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Mesoscale model experience with UM at met.no HIRLAM-ALADIN-MF miniworkshop 12/12/05 Dag Bjørge
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Mesoscale model experience with UM at met.no

Jan 23, 2016

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Mesoscale model experience with UM at met.no. HIRLAM-ALADIN-MF miniworkshop 12/12/05 Dag Bjørge. NWP collaboration in Europe. 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 - PowerPoint PPT Presentation
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Page 1: Mesoscale model experience with UM at met.no

Mesoscale model experience with UM at met.no

HIRLAM-ALADIN-MF miniworkshop 12/12/05Dag Bjørge

Page 2: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

NWP collaboration in Europe

Page 3: Mesoscale model experience with UM at met.no

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

Page 4: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

How does it perform ?

Page 5: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Temperature

Page 6: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Page 7: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Page 8: Mesoscale model experience with UM at met.no

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 …

Page 9: Mesoscale model experience with UM at met.no

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 )

Page 10: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

What does it look like ?

• Quasi operational runs• Different experiments• Temperature problem solved (last

week)

Page 11: Mesoscale model experience with UM at met.no

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.

Page 12: Mesoscale model experience with UM at met.no

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.”

Page 13: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

• Orography and resolution ( ”Seven sisters” )

Page 14: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

LBCs (~50km) for Hirlam20 and Hirlam10 at 3 hour intervals ( usually 6 hours old )

Page 15: Mesoscale model experience with UM at met.no

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 )

Page 16: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Hirlam10 and UM4

Page 17: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

UM 4km with three UM 1km grids

Page 18: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

The ”lifetime” of LBCs in a small grid

•30min intervals

Page 19: Mesoscale model experience with UM at met.no

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

Page 20: Mesoscale model experience with UM at met.no

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

Page 21: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

UM1, Sandnessjøen

Page 22: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Example of product, inflight cone

Page 23: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Example of product, inflight turbulence in cross section

Page 24: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Some examples of different treatment of precipitation in the different models

Page 25: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

”Precipitation shaddow”, Hirlam / UM

Page 26: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Tromsø-area, Hirlam10 and UM4

Page 27: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Structure of precipitation, HL20/10, UM4, radar

Page 28: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Ad hoc setup of UM for the Barents sea

• Example showing a ”polar low”

Page 29: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Polar low in UM 4km

Page 30: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Hirlam10 og UM4

Page 31: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

UM4 +23h, mslp and wind

Page 32: Mesoscale model experience with UM at met.no

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.

Page 33: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Page 34: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Page 35: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Page 36: Mesoscale model experience with UM at met.no

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

Page 37: Mesoscale model experience with UM at met.no

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

Page 39: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

Hirlam 4km UM 4km

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Norwegian Meteorological Institute met.no

Hirlam 4km, 12h accumulated precip

Page 41: Mesoscale model experience with UM at met.no

Norwegian Meteorological Institute met.no

UM 4km, 12h accumulated precip