1. met.no – SMHI experiences with ALARO
03/24/11
met.no – SMHI experiences with ALARO
ALADIN Workshop & HIRLAM ASM, 5-8 April 2011, Norrköping, Sweden
Ulf Andrae (SMHI), Trygve Aspelien (met.no), Lisa Bengtsson-Sedlar (SMHI),
Mariken Homleid (met.no), Magnus Lindskog (SMHI) and Ole Vignes (met.no)
This poster template is from It is free, free, free for non-commercial use. But if you really like it, I’m always thrilled to get postcards from wherever you happen to be presenting your poster. Or, send me cookies! My kids made me put that last sentence in. Have fun. Sincerely, Colin Purrington, Department of Biology, Swarthmore College, Swarthmore, PA 19081, USA.
Daily ALARO runs in Norway
Daily ALARO runs in Sweden
History and status
Harmonie4
From August 2008 – 33h0
4 km resolution
ALADIN physics
Boundaries from Hirlam8
From 30 October 2008 – 33h1
ALARO physics
From 17 February 2010 – 35h1.2
Surface analysis
From 13 September 2010 – 36h1.1
ALARO with SURFEX
System Design
SMHI HARMONIE 2010:
35h1.3
5.5 km horisontal resolution
60 vertical levels (HIRLAM definitions)
Lateral boundaries from ECMWF
Forecast length: 0-36 h
ALARO with 2-L ISBA (not SURFEX)
Surface analysis and 3DVAR
SMHI HARMONIE 2011:
36h1.3
ALARO -0 physics with surfex scheme 1
Plans for 2011/2012
Harmonie5.5
36h1.3
5.5 km resolution
ALARO with SURFEX
Boundaries from ECMWF
Surface analysis and 3DVAR
Harmonie2.5
2.5 km resolution
AROME
Probably boundaries from ECMWF
Model domain (blue frame) and NOAA 18 AMSU-A channel 10
data coverage for one particular case (red dots).
SMHI HARMONIE 3DVAR
6 h data assimilation cycle.
Background error statistics from differences of downscaled forecasts. These are downscaled from an ECMWF data assimilation ensemble experiment.
Conventional types of observations and ATOVS AMSU-A channels 6-10.
Variational Bias Correction.
Monitoring System for satellite data to be introduced to HARMONIE system.
No observations closer to lateral boundary than 250 kms are assimilated.
Future plans include assimilation of ATOVS AMSU-A/MHS, radar radial winds, and GPS ZTD.
Summary verification of Harmonie4, UM4, Hirlam4/8/12 and ECMWF at Norwegian synop stations Autumn 2010
Web-based satellite data assimilation monitoring system to be included in the HARMONIE system. Monitoring of satellite observation minus background departures (left) and of variational bias correction (right).
Harmonie4 T2m:
acceptable
Harmonie4 10 m wind speed:
still too weak…
Harmonie4 precipitation:
VERY promising
Experiences over Norway with Harmonie4 - 36h experiences at SMHI with 36h1.3
Previous versions of Harmonie had large and systematic errors related to the physics, e.g.:
very low surface temperatures in winter
too low wind speed over land
36h1.1 with SURFEX from Seep 2010 shows significant improvements which can be related to
tiling (nature/sea/lake/town)
canopy module (multilayer surface scheme)
increased wind speed (from A to B) with reduced drag as a function of st.dev. of Small Scale Orography (C), but still too low (D)
mean orography instead of envelope
ALARO still have problems predicting the low temperatures (D) The daily T2M cycle shows good perfomance during daytime (D). Recent sensitivity tests indicates that a better surface assimilation may help.
Very good wind speed over low land (F), still underestimation over high land ( not shown )
Better daily cycle for clouds(G) and better precipiation ( not shown)
Comparison against radio sondes shows similar perfomance for ALARO and HIRLAM
Red: ALARO 5.5km , Green: HIRLAM 5.5km, blue observations D E A C F G B D
10m wind
speed at Sognefjell
Harmonie4
UM4
Hirlam4
Future work
Improved treatment of snow and lakes
Implement and evaluate EKF for surface assimilation
Improved observation usage
Look into reasons for poor 10 meter wind scores in high terrain
SMHI and met.no plans for a joint operational NWP suite on the 2-5km scale in Integration and preparations starts during autumn 2011.
References
Le Moigne, P., 2009: SURFEX OFF-LINE Scientific Documentation and User’s Guide, available at
Taillefer, F., 2002: CANARI – Technical Documentation – Based on ARPEGE cycle CY25T1 (AL25T1 for ALADIN), available at