Operational ECMWF system
September to December 2008.
Averaged over all model layers and entire global
atmosphere. % contribution of
different observations to reduction in forecast
error.
GPS RO has significant
impact (ranked #5 among
all observing systems)
in reducing forecast errors, despite the small
number of soundings.
Courtesy:
Carla Cardinali
and
Sean Healy, ECMWF
22
Oct. 2009
Forecast error contribution (%)