Observation pre-processing Observation pre-processing in in thethe ARPEGE/ALADIN modelARPEGE/ALADIN model

Roger RandriamampianinaRoger Randriamampianina Hungarian Meteorological ServiceHungarian Meteorological Service

ALADIN 3D-Var/ODB training course, Budapest, 6-10 June, 2006ALADIN 3D-Var/ODB training course, Budapest, 6-10 June, 2006

Local pre-processing:

OULAN

BATOR

1C RAD. BIAS CORRECTION

OutlineOutline

OULAN

Source: www.wmo.intSource: www.wmo.int

Real time available data:Real time available data: NetworksNetworks ObservatioObservationns arrive through s arrive through - GTS (Global Telecommunication - GTS (Global Telecommunication

System) in ASCII or BUFR formatSystem) in ASCII or BUFR format - Direct Sat. Reception – (Budapest HRPT - Direct Sat. Reception – (Budapest HRPT

Station)Station) - Special TCP/IP lines- Special TCP/IP lines - Internet FTP in some cases - Internet FTP in some cases

ProvidersProviders - All WMO countries for most of the - All WMO countries for most of the

observation typesobservation types - Space agencies for Satellite observations - Space agencies for Satellite observations

(Eumetsat, ESA, NESDIS, NASA, (Eumetsat, ESA, NESDIS, NASA, DMSP)DMSP)

- NMS for the local national data- NMS for the local national data

TypeTypess of observations of observations

Conventional ObservationsConventional Observations Surface data:Surface data: - - SynopSynop, Ship, Ship - Bathy, Tesac- Bathy, Tesac - Buoy- Buoy Upperair data:Upperair data: - Airep, - Airep, AmdarAmdar, Acar, Acar - - TempTemp, Temp-ship, Temp-mobil, , Temp-ship, Temp-mobil,

Temp-dropTemp-drop - Pilot, Pilot-ship, - Pilot, Pilot-ship, EuroprofilEuroprofil, Profiler, Profiler - Satob, Satgeo, - Satob, Satgeo, geowind (MET-8)geowind (MET-8)

Satellite ObservationsSatellite Observations MeteosatMeteosat:: - - SEVIRISEVIRI Clear sky radiancesClear sky radiances NOAA Atovs:NOAA Atovs: - - Hirs, Amsua, Amsub, MhsHirs, Amsua, Amsub, Mhs DMSP:DMSP: - Ssm/I- Ssm/I AQUAAQUA:: -Airs-Airs

GTS

Eumetcast

…

FTP

BUFR

Intermediate ASCII

Or direct reading

oulan

Data pre-processing at HMSData pre-processing at HMS

Pre-processing chainPre-processing chain::

oulan bator

ASCII

…

screening

Reading Reading of of datadataand and coding of coding of additional additional informationinformation

Blacklisting andBlacklisting andcreation of the ODBcreation of the ODB

Complex quality Complex quality check and data check and data

selectionselection

Observation usage (in surface analysis)Observation usage (in surface analysis)

Observation usage (in variational analysis)Observation usage (in variational analysis)

Message Message typetype

Observation typeObservation type Extracted Extracted parameters parameters

Used parametersUsed parameters Parameters Parameters blacklisted or not blacklisted or not usedused

1C level Radiances

Observation: multichannels Polar Satellites

•Tb •Sat identifier•Scanning line•Scan angle (number of FOV)•Zenith angle•Azimuth angle•Satellite altitude

•Tb in some channels, depending on the nature of the surface (land, sea or ice), cloud fraction and model orography

•Tb in some channels, depending on the nature of the surface (land, sea or ice), cloud fraction and model orography

Channel numberChannel number 11 22 33 44 55 66 77 88 99 1010 1111 1212 1313 1414 1515

Over LandOver Land             xx xx xx xx xx xx xx xx         

Over SeaOver Sea             xx xx xx xx xx xx xx xx         

Over Sea iceOver Sea ice                   xx xx xx xx xx xx         

Cloudy pixelCloudy pixel                      xx xx xx xx xx         

Over land channels 5 and 6 are used when the model orography is less than 500m and 1500m, respectivelyOver land channels 5 and 6 are used when the model orography is less than 500m and 1500m, respectively

Example: Use of RAD1C AMSU-AExample: Use of RAD1C AMSU-A

Observation usage (Satellite radiances)

Read_Synop

Ext_lam_Synop

LSYNOP

Read_Amdar

Ext_lam_Temp

LTEMP

Read_Amsub

Ext_lam_Amsub

LTOVSAMSUB

…

…

…

OULAN

NamelistNamelistcontrolcontrol

OBSOUL

You need You need to changeto changein case of in case of

local local implementationimplementation

The oulan procedureThe oulan procedure

oulan_lam_extract

Oulan: from the export version under “UTI” directoryThe added files:

ext_amsua_aapp.f – read the native sat file (AMSU-A)ext_amsub_aapp.f – ==========x ==== (AMSU-B)ext_hirs_aapp.f – ==========x ==== (HIRS)ext_synop_netcdf.f – read the netCDF SYNOP dataext_temp_netcdf.f – read the netCDF TEMP dataoulan_lam_elev.f – read the elevation data from TLSnetcdf.inc – netCDF include fileama1c.h, amb1c.h, hirs1c.h, netcdf.h – include files

Modifications compared to the original codeModifications compared to the original code

The modified files: ext_{obs_type}.f ext_lam_{obs_type}.fWhere obs_type:

synop, temp, geowind, satob, europrofil, amsua, amsub, hirs

!!! There are two versions of the oulan_carobs in the source directory No change in the OBSOUL format Change in case of new obs. (eg. AMSU-B) (cy24 vs cy28) The number of the arguments in oulan_carobs has changed

The surface and radiosonde observations: from netCDF files;

synop, tempThe 1C radiance data:

from AAPP native format; amsua{01-20}, amsub{01-20}, hirs (to be modified)

The aircraft observation: from ASCII (FM42) and BUFR files

read separately and arranged in amdar_ascii.dat The Atmospheric Motion Vector data:

from BUFR files; read separately and arranged in geowind_ascii.dat

The windprofiler data: from BUFR files (complicated, additional changehad to be done to read the proper station identifier);

read separately and arranged in profiler_ascii.dat

Data in BUFR format are extracted out of the oulan program ! except the AMV, data are stored in different files

Data extraction from the database at the HMSData extraction from the database at the HMS

&NADIRS NDATE=20020225, NRESO=00, ALANZA = 90., ALASZA = -90., ALOOZA = -180., ALOEZA = 180., NDIFFM1 = 30, NDIFFP1 = 30, NDIFFM2 = 300, NDIFFP2 = 259, LTOVSAMSUA = .TRUE., LTOVSAMSUB = .TRUE., LTOVSHIRS = .FALSE., LTEMP = .TRUE., LSYNOP = .TRUE., LAMDAR = .TRUE., LEUROPROFIL = .TRUE., LGEOWIND = .TRUE., LSATOB = .FALSE., NINIT = 0, LRH2Q = .TRUE., /END &NANBOB NBTOVSAMSUA = 80000, NBTOVSAMSUB = 80000, NBTOVSHIRS = 8000, NBTEMP = 1000, NBSYNOP = 4000, NBAMDAR = 9000, NBEUROPROFIL = 8000, NBSATOB = 20000, NBGEOWIND = 20000, /END

The The NAMELISTNAMELIST file file

in ASCII formatin ASCII format - each observation represent- each observation representss one article consisting of: one article consisting of:

- one header (describing the observation)- one header (describing the observation)- bodies (as many as the number of the observed/measured parameters)- bodies (as many as the number of the observed/measured parameters)

Header: - total length of the observation article integer - observation type integer - observation characteristicsobservation characteristics integer - latitude real - longitude real - station identification character - date of the measurement integer - hour of the measurement integer - altitude real - number of number of the the parametersparameters (ie. bodies) integer - observation quality flags integer - site dependant info integer

First article: - date (analysis) integer - hour (network time) integer

The OBSOUL fileThe OBSOUL file

Body (ies): - parameter type integer - first vertical coordinate real - second vertical coordinate (if necessary or other) integer - observed/measured parameter real - parameter quality flag integer

Example:20041215 1242 1 10014011 48.10000 19.51667 '12756 ' 20041215 120000 153.0000000 6 1111 100000 1 -103290.0000 0.1699999976E+39 0.0000000000E+00 2064 39 101310.0000 0.1699999976E+39 271.2600098 2048 58 101310.0000 0.1699999976E+39 82.00000000 2048 7 101310.0000 0.3211538133E-03 0.2632536227E-02 2048 41 101310.0000 3.000000000 190.0000000 2048 91 101310.0000 0.1699999976E+39 100.0000000 2048

22 2 10051144 43.52000 5.22000 'EU4426 ' 20041215 100700 182.8800049 2 11111 0 2 182.8800049 0.1699999976E+39 284.3599854 4111 3 182.8800049 4.110000134 124.0000000 4111

22 3 103254090 56.95500 -7.19100 ' 055' 20041215 114500 0.1699999976E+39 2 11111 0 200 69.00000000 0.1699999976E+39 0.1699999976E+39 9 3 30160.00000 28.79999924 296.0000000 2063

synop

Amdar

AMV/geowind

The OBSOUL fileThe OBSOUL file

To be continued …

Any questions ?

Exercises Exercises

1(a,b)- 1(a,b)- create a single T(a) or V(b) obs. form create a single T(a) or V(b) obs. form aircraft data around 500 hPaaircraft data around 500 hPa

2- 2- change the obs. errors for specific humidity change the obs. errors for specific humidity for radiosonde datafor radiosonde data

idea: check the ext_lam_temp around the variable ZQEEFH

3- 3- simulate the implementation of the PILOT obs. using simulate the implementation of the PILOT obs. using measurements from radiosondemeasurements from radiosonde

idea: copy ext_pilot.F from the “UTI/oulan” directory and follow changes in the ext_lam_temp.f. Remember, that in the pilot report we have only wind measurements.

2 and 3 need the (re-)compilation of the code. To do so, please copy the oulan directory 2 and 3 need the (re-)compilation of the code. To do so, please copy the oulan directory from ~wshop01/Preproc to your Preproc directory. Use “compile_oul” for compilation and from ~wshop01/Preproc to your Preproc directory. Use “compile_oul” for compilation and

“create_oulan” to create the executable file.“create_oulan” to create the executable file.