Status Report for WRF’s Varational Data Assimilation 对WRF模式的变分的资料同化的状态的报告

1、 crown copyright 2012. source: met officedale barker, tomas landelius, eric bazile, francesco isotta, phil jones17 april 2013euro4m wp2: regional reanalysis overview crown copyright 2012 source: met office crown copyright 2012. source: met officeeuro4m wp2wp2.1 building capacity for advanced regiona

2、l data assimilation (meto)wp2.2 dynamical downscaling of era (smhi).wp2.3 2d mesoscale downscaling (mto france).wp2.4 evaluation (meteoswiss).wp2.5 improvement of input data for reanalyses (uea)now crown copyright 2012. source: met officeeuro4m wp2.1 highlightsinitial um 4d-var reanalysis run for 20

3、08-2009 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 crown copyright 2012. source: met officeeuro4m wp2.1 highlightsfocus now on full observation rerun (satellite, cloud),

4、 provision of data for joint evaluation (- wp2.4), cibs (-wp3), and data provision (-wp4).validation of climate indices(peter jermey)cloud from synop reports crown copyright 2012. source: met officeeuro4m wp2.2 highlightshirlam 3d-var reanalysis completed 50% of 20yr period (1989-1997, 2009-2010). e

5、valuation against era performed:focus now on completing period and 2007-2009 intercomparison period (-wp2.1, wp2.4).november 1996 precipitation:hirlamera crown copyright 2012. source: met officehirlam 22 kmmesan 5 kme-obs 6.0 obse-obs 7.0, 0.25euro4m wp2.3 highlights (smhi)daily precipitation reanal

6、ysis begun (d2.4), comparison with e-obs(-wp2.4). future: complete precip analysis, but only few years for u10? crown copyright 2012. source: met officemescan-europe at 5.5kmuse the hirlam 3dvar re-analyses at 22km 2d-downscaling mescan run at ecmwf, use gl software (smhi) to downscale the hirlam 22

7、km file to 5.5km: t2m, hu2m, wind, rr24, lwd, swd,pseca&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 06utc1 month of analysis

8、 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)

9、 for dec 2009monthly mean of daily mescan analysed accumulated precipitation (mm) dec 2009 crown copyright 2012. source: met officeeuro4m 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

10、&d obs from wp1.heidke skill scoreoct 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 devel

11、opment is required. crown copyright 2012. source: met officeeuro4m wp2.4 highlightsevaluation 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

12、 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

13、bring together wp1 and wp2. (d2.7-d2.13) in last year of project. crown copyright 2012. source: met office crown copyright 2012. source: met officeeuro4m wp2.5 highlightswp2.5 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? crown copyright 2012. source: met officeeuro4m wp2 deliverables/milestonesyear 1year 2year 3year 4nowdeliverables on tr