Monitoring and assimilation of SCIAMACHY data at ECMWF

1
Monitoring and assimilation of SCIAMACHY data at
ECMWF Antje Dethof, ECMWF
2
Monitoring of SCIAMACHY ozone columns
Global means, 1 Mar 30 June 2004
ESA NRT retrievals
KNMI TOSOMI retrievals
3
Monitoring of SCIAMACHY ozone columns, Global
means 1 - 31 Oct 2004
ESA NRT retrievals
KNMI TOSOMI retrievals
Problem with climatology?
4
ESA NRT L2 product, April 2004
Data gap
SCIA DU
(obs-fg)/fg
KNMI NRT L2 TOSOMI product
5
Assimilation of SCIAMACHY (TOSOMI) ozone
23 May 2004
No SCIA
With SCIA
TOMS
6
Assimilation of SCIAMACHY (TOSOMI) ozone
11 Sept 2004
No SCIA
With SCIA
TOMS
7
Assimilation of SCIAMACHY (TOSOMI) ozone
Fit to ozone sonde profiles
8
Assimilation of SCIAMACHY (TOSOMI) ozone
Fit to Neumayer ozone sonde profiles (lat-71,
lon-8)
Problem from assim. of ozone columns
9
Assimilation of SCIAMACHY (TOSOMI) ozone
Fit to SBUV/2 data from NOAA-16 (1 23 May 2004)
Obs-ana-10.5 DU Stdv14.7 DU
Obs-ana3.2 DU Stdv14.7 DU
No SCIA
with SCIA
Ozone layer 16 hPa - surface
10
Conclusions

• Passive monitoring shows
• Problems with ESA NRT SCI_RV__2P data before
  April 2004 (improved after 27 April 2004, but
  new problems in
• October 2004)
• Data coverage Some data not available in NRT
• (improved since August2004)
• Differences between ESA and KNMI retrievals
• (reduced after change on 27 April)
• Assimilation of TOSOMI SCIAMACHY data
• Improved fit of ECMWF ozone column and profiles
  to
• independent data
• Included in the operational ECMWF system since
• 28 September 2004