TY - RPRT
AU - Fabrizio Baordo
AU - Alan Geer
AU - S.J. English
AB - This report summarises a feasibility study investigating the possibility to assimilate SSMI/S humidity sounding observations over land in the all-sky framework within the ECMWF system. The use of these channels might bring additional information to that already available by the assimilation of other microwave sounders radiances and helps to enhance and constrain the humidity analysis. The findings show that first guess departures of SSMI/S and MHS humidity sounding channels not only have very similar distribution in shape and intensity, but the standard deviations computed over the whole sample are also comparable. This result is very important as a Gaussian and unbiased distribution of first guess departure is the necessary 4D-Var assumption that must be satisfied before any sample of observations can be considered for an assimilation experiment.
BT - EUMETSAT/ECMWF Fellowship Programme Research Reports
C1 - Research
CY - Shinfield Park, Reading
DA - 11/2012
LA - eng
M1 - 27
N2 - This report summarises a feasibility study investigating the possibility to assimilate SSMI/S humidity sounding observations over land in the all-sky framework within the ECMWF system. The use of these channels might bring additional information to that already available by the assimilation of other microwave sounders radiances and helps to enhance and constrain the humidity analysis. The findings show that first guess departures of SSMI/S and MHS humidity sounding channels not only have very similar distribution in shape and intensity, but the standard deviations computed over the whole sample are also comparable. This result is very important as a Gaussian and unbiased distribution of first guess departure is the necessary 4D-Var assumption that must be satisfied before any sample of observations can be considered for an assimilation experiment.
PB - ECMWF
PP - Shinfield Park, Reading
PY - 2012
EP - 35
T2 - EUMETSAT/ECMWF Fellowship Programme Research Reports
T3 - EUMETSAT/ECMWF Fellowship Programme
TI - SSMI/S radiances over land in the all-sky framework: one year report
UR - https://www.ecmwf.int/node/7932
ER -