D29 Report on MM5 GPSPW 3DVar
This report is part of work-package 4200, the purpose of which is
* Development of GPS ZTD assimilation software for the 3DVar
assimilation system for the mesoscale NWP model MM5.
* Investigate the impact of assimilation of GPS PW into the MM5 at high
resolution using different assimilation techniques: nudging and 3DVAR.
Methodology/Work Description: Recent work showed the impact of
the assimilation of GPS precipitable water (PW) into high resolution
(Faccani et al., in preparation) for a few cases using the
technique. It is desirable to test this technique operationally and
it with a more accurate assimilation technique such as 3DVAR.
the first period the GPS PW will be assimilated through nudging, in the
time the 3DVAR system will be implemented and the assimilation will be
out using the 3DVAR only. A comparison with the nudging will be
for a few selected cases. The GPS ZTD assimilation technique will be
for fully operational use.
The results of the MM5 GPSPW 3DVar experiments are being reported in a
of articles in refereed scientific journals of which this is
the most recent: Facani, C., R. Ferritti, R. Pacione, T. Paolucci, F.
Vespe, and L.
Cucurull: Impact of a high density
GPS network on the operational forecast. Advances in
Geosciences, vol 2, p. 73, 2005.
For further information contact Claudia Faccani at
email@example.com or Rossella Ferretti at