© Crown Copyright 2012. Source: Met Office Dale Barker, Tomas Landelius, Eric Bazile, Francesco...

© Crown Copyright 2012. Source: Met Office

Dale Barker, Tomas Landelius, Eric Bazile, Francesco Isotta, Phil Jones

17 April 2013

EURO4M – WP2: Regional Reanalysis Overview

© Crown Copyright 2012 Source: Met Office


EURO4M WP2

• WP2.1 Building capacity for advanced regional data assimilation (MetO)• WP2.2 Dynamical downscaling of ERA (SMHI).• WP2.3 2D mesoscale downscaling (Météo France).• WP2.4 Evaluation (MeteoSwiss).• WP2.5 Improvement of input data for reanalyses (UEA)

Now


EURO4M WP2.1 Highlights

• Initial UM 4D-Var reanalysis run for 2008-2009 period. UM data now stored in MARS archive (with assistance from ECMWF) for joint evaluation/user access (see Renshaw talk).

Initial 2008-2009 IntercomparisonEURO4M Orography



• Focus now on full observation rerun (satellite, cloud), provision of data for joint evaluation (-> WP2.4), CIBs (->WP3), and data provision (->WP4).

Validation of climate indices

(Peter Jermey)Cloud from SYNOP reports



• HIRLAM 3D-Var reanalysis completed ~50% of 20yr period (1989-1997, 2009-2010). Evaluation against ERA performed:

• Focus now on completing period and 2007-2009 intercomparison period (->WP2.1, WP2.4).

November 1996 Precipitation:

HIRLAM ERA


HIRLAM 22 km MESAN 5 kmE-OBS 6.0 obs

E-OBS 7.0, 0.25°

EURO4M WP2.3 Highlights (SMHI)• Daily precipitation reanalysis begun (D2.4), comparison with E-OBS

(->WP2.4). Future: Complete precip analysis, but only few years for U10?


MESCAN-Europe at 5.5km

• Use the HIRLAM 3Dvar re-analyses at 22km • 2D-Downscaling MESCAN run at ECMWF, use GL software (SMHI) to downscale the HIRLAM 22km

file to 5.5km: T2m, Hu2m, Wind, RR24, LWD, SWD,Ps• ECA&D datasets of 24-h precipitation observation not straightforward to be used, so we mainly rely on

the MF GTS observation files.• MESCAN T2m, Hu2m is performed every 6 hours and a 24-h precipitation analysis is done at 06UTC• 1 month of analysis takes ~ 30h, so 4 years in ~2 months, if no other technical problem!• Re-analyses for 3 months have been done for Dec2009, Jan2010 and June 2010 (period used for the

SAFRAN/MESAN comparison D2.10) for testing and validation purposes.

Monthly mean of daily HIRLAM first-guess accumulated precipitation (mm) for Dec 2009

Monthly mean of daily MESCAN analysed accumulated precipitation (mm) Dec 2009


EURO4M WP2.3 Highlights (MF)• New ‘EnsVar’ technique to provide ensemble covariance for 2D analysis

(D2.5).

• OI precip analysis produced (see Bazille talk).

• Now able to use ECA&D obs from WP1.

Heidke Skill Score

Oct 2009 June 2010 (France)

MESCAN daily precipitation analysis (blue) gives better HSS than SAFRAN for RR24 > 5mm/day. Nevertheless, over the Alps, M. Lafaysse has shown that SURFEX/Crocus forced by SAFRAN is still better than forced by MESCAN more

specific development is required.


EURO4M WP2.4 Highlights• Evaluation activities to date:

• MO focus on evaluation of UM reanalysis against ERA, ECA&D and observations (->WP1) and via climate CIBs (->WP3). Renshaw talk.

• MS initial focus on Alpine (1998-2006) precipitation using ERA, HIRLAM data (->WP2.2). See Isotta talk.

• SMHI/MF focus (->WP2.3) on precipitation evaluation (Oct 2009 – June 2010 ->WP2.3). See SMHI and MF talks.

• DWD: Evaluation of HIRLAM reanalysis (->WP2.2) using satellite data (->WP1.2) for 1990-1995 period. See Trentmann talk.

• Future: Evaluation is major focus to bring together WP1 and WP2. (D2.7-D2.13) in last year of project.



• WP2.5 Improvement of input data for reanalyses (UEA): Improved QC/ homogenization of surface data for reanalyses (sea-level pressure, relative humidity, wind speed and direction and temperature).

• Future: Further improvements to QC. Use in WP2 evaluation/reanalysis?


EURO4M WP2 Deliverables/Milestones

Year 1 Year 2 Year 3 Year 4Now

• Deliverables on track but need to discuss D2.3-D2.5.• Year 1-2, largely preparation (much technical work).• Year 3-4 ‘pre-production’ runs plus evaluation (enhanced collaboration).


Questions/Discussion?

© Crown Copyright 2012. Source: Met Office Dale Barker, Tomas Landelius, Eric Bazile, Francesco...

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