Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 1 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system Gergely Bölöni/Roger Randriamampianina/ Regina Szoták/Gabriella Csima 25th EWGLAM and 10th SRNWP meetings 6-9 October, Lisbon

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 2 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon Main research directions (ALADIN and generally) The two is interacting (very simple grouping!) Methods New observation types

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 3 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon ALADIN 3d-var in Hungary Parallel suite: •6 hour cycle –background: ALADIN forecast –initialization: DFI –LBC: ARPEGE long cut-off analyses •background errors: NMC method •observations: radiosondes (TEMP) and local surface (SYNOP) data (Operational is dynamical adaptation!) Testings: • use of satellite (ATOVS) data • use of aircraft (AMDAR) data

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 4 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon The Domain •6.5km resolution •37 vertical levels

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 5 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon ATOVS data (1) (Advanced TIROS Operational Vertical Sounder) Local reception: •HRPT antenna (High Resolution Picture Transmission) •Satellites: NOAA-15, -16 (max 3 orbits/window) •Instrument: AMSU-A (temperature)

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 6 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon ATOVS data (2) Local pre-processing: •AAPP1C level data •Channel selection: 7 channels like in ARPEGE over land •Bias correction (Harris and Kelly, 2001): - scan angle error - 4 predictors to correct model to obs errors •inclusion to ODB (the usable data base for 3d-var)

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 7 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon ATOVS experiments 4 assimilation cycles using ATOVS: Control: •3d-var parallel suite (SYNOP + TEMP only) • 2 using different thinning distances (120 and 80 km) • 2 using univariate and multivariate formulation of the B matrix for specific humidity

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 8 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon ATOVS results (1) Score comparisons: (RMSE and BIAS of 48h forecasts) •80 km > 120km here only 80 km results •slight improvement in 850hPa geopotential (mostly neutral results for other levels) ATOVS control

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 9 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon ATOVS results (2) •mostly neutral results for temperature and wind generally (850hPa is shown) ATOVS control

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 10 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon ATOVS results (3) multivariate q •negative impact on humidity in general ATOVS control initiative to try the univariate q formulation

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 11 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon ATOVS results (4) univariate q ATOVS uni q control ATOVS uni q ATOVS •but we loose some improvement on geopotential! multivariate humidity should not be forgotten.

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 12 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon AMDAR data (1) (Aircraft Meteorological Data Reporting) AMDAR is available through GTS. Pre-processing is only the inclusion of the raw reports into ODB (the usable data base for 3d-var)

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 13 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon AMDAR data (2) •useful information near the airports (vertical sounding) •Observations: T, u, v

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 14 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon AMDAR experiments 2 assimilation cycles using AMDAR: •170 km thinning (like in ARPEGE) •50 km thinning Control: •3d-var parallel suite (SYNOP + TEMP only)

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 15 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon AMDAR results (1) Score comparisons: •170 km > 50 km here only 170 km results •neutrality or slight improvement for all variables (850hPa is shown) AMDAR control

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 16 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon AMDAR results (2) AMDAR control

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 17 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon Conclusions & continuation •Mainly neutral impact for both ATOVS and AMDAR. Case studies of interesting situations •How to improve: ATOVS: –channel selection (problem with some of the used channels) –tuning of  o (softer channel selection) AMDAR: –finer thinning (resolve problems with it) •ATOVS & AMDAR together

Gergely Bölöni, Roger Randriamampinanina, Regina Szoták, Gabriella Csima: Assimilation of ATOVS and AMDAR data in the ALADIN 3d-var system 18 _____________________________________________________________________________________ 25th EWGLAM and 10th SRNWP Meetings, 6-9 October 2003, Lisbon Many thanks for your attention!