BULGARIA NATIONAL STATUS REPORT 2004

1
BULGARIANATIONAL STATUS REPORT 2004

• Operational changes

• The operational suite was switched to the new
  SELAM coupling domain and new coupling files (41
  levels) on 06.07.2004
• The Al25t1 second export version is running on
  the ALADIN-BG integration domain (90x72 points,
  41 levels) on two processor LINUX PC
• The visualization tool is GRADS v1.9xp5 for
  LINUX
• References
• ALADIN Newsletter 26 January July 2004, p.10
• More details Andrey.Bogatchev_at_meteo.bg

2
Research activities

• VarPack
• The purpose of the work, done during the stay of
  L.Taseva in CNRM/GMAP , under the tution of
  L.Auger, has been to study the possibility of
  implementation of the CNRM/GMAP,/3DVAR/Aladin
  scheme for diagnostic and nowcasting purposes and
  to develop an analog of the CNRM/GMAP/Diagpack/Ala
  din, based on the CANARI OI scheme. Some
  modifications of 3DVAR scheme have been done to
  improve the fit to the observations (increase of
  the SD for background error statistics,
  modifications of surface temperature). The main
  differences between VarPack and DiagPack are
• The analysed variable is specific humidity
  instead of relative humidity
• The diagnostic CAPE and MOCON fields can be
  derived either from the fields at the lowest
  model level or from the re-computed 2m(T,q) or
  10m(V) fields, whereas in DiagPack they are
  computed from the analysed screen-level fields.   

• Case study for two synoptic situations
  (09.10.2001,18.08.2001) and validation tests
  have been performed. It has been shown that
• MOCON fields obtained by DiagPack and Varpack are
  similar, but MOCON fields by Varpack are
  smoother
• the comparison of the MOCON and CAPE fields with
  the hourly radar images has shown that both
  fields obtained by VarPack correspond better to
  the radar pictures than those obtained by
  DiagPack.
• References
• L.Taseva,L.Auger Varpack . Technical report
  (10th of May 19th of June 2004).
  MeteoFrance/CNRM/GMAP Available at
  http//www.cnrm/meteo.fr/aladin/publications/repor
  t.html/
• ALADIN Newsletter 26 January July 2004, p.27