Monitoring of near-real-time SCIAMACHY, MIPAS, and GOMOS data at ECMWF
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Monitoring of near-real-time SCIAMACHY, MIPAS, and GOMOS data at ECMWF. Outline. ECMWF model Operational ozone assimilation Monitoring of Meteo products - SCIAMACHY (SCI_RV__2P) - MIPAS (MIP_NLE_2P) Summary. Author: Antje Dethof (ECMWF). The ECMWF model.

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Monitoring of near-real-time SCIAMACHY, MIPAS, and GOMOS data at ECMWF

Outline

  • ECMWF model

  • Operational ozone assimilation

  • Monitoring of Meteo products

    - SCIAMACHY (SCI_RV__2P)

    - MIPAS (MIP_NLE_2P)

  • Summary

Author: Antje Dethof (ECMWF)


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The ECMWF model data at ECMWF

  • Global spectral model (u,v,T,ps,q,o3,cc,cl,ci)

  • Resolution: - TL511  40 km(TL159)

  • - 60 levels up to 0.1 hPa ( 65 km)

  • Comprehensive physics package

  • Ozone is prognostic model variable

  • Data assimilation system: 12-hour 4D-Var (6-hour 3D-Var)


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Operational ozone assimilation (4D-Var) data at ECMWF

  • GOME (ERS2):

  • - Total column ozone

  • - NRT retrievals from KNMI

  • (version FD 3.1)

  • - approx. 20000 obs daily (14000 used)

  • Blacklist criteria:

  • - at solar elevations < 10°

  • - at latitudes > 40° in NH

  • - at latitudes < -50° in SH

  • - QC flag > 0

  • SBUV/2 (NESDIS retrievals):

  • - NOAA-16

  • - NOAA-14 passive

  • - NOAA-17 passive (since 20020804,18z)

  • - 6 ozone layers:

  • 0.1-1 hPa, 1-2 hPa, 2-4 hPa,

  • 4-8 hPa, 8-16 hPa, 16hPa – surface

  • - approx. 1400 obs daily (1200 used)

  • Blacklist criteria:

  • - at solar elevations < 6°

  • - QC flag > 0


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Observations data at ECMWF

Departures (first-guess, analysis)

Monitoring

  • Passive assimilation: Data are not assimilated actively, but go through the assimilation system and statistics (e.g. first-guess departures) are calculated

  • Use assimilation system to evaluate data quality, biases, instrument and algorithm stability (can also show model problems)

  • Output statistics:

    - Number of data

    - Mean

    - Stdev of


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Monitoring of SCIAMACHY Meteo data (SCI_RV__2P) data at ECMWF

Ozone

  • Meteo products from ftp-ops.pdk.envisat.esa.int, converted into BUFR format at ECMWF

  • SCIAMACHY ozone data about 25 DU lower than KNMI GOME data in tropics and mid-latitudes

  • Unrealistically large values at high latitudes

  • Unrealistically low values at high southern latitudes that were seen earlier have disappeared

  • No geolocation information (e.g. sza, fov) in Meteo data


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SCIAMACHY total column ozone: 18.-24.11.2002 data at ECMWF

SCIAMACHY

GOME (KNMI)


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SCIAMACHY total column ozone: 18.-24.11.2002 data at ECMWF

SCIAMACHY

GOME (KNMI)

Unrealistically

large values

Observation values

Fg departures

25 DU


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Monitoring of MIPAS Meteo data (MIP_NLE_2P) data at ECMWF

Temperature

  • Good agreement of MIPAS temperatures with ECMWF analyzed temperatures over large part of stratosphere (diff < 2%)

  • Largest differences at 0.1 hPa (ECMWF model top)

  • MIPAS temperatures too low at bottom end of profiles

    (cloud contamination ?)

    Upgrade on 13.11.2002, 12z:

  • Reduced fg-departures (MIPAS – ECMWF) below 60-80 hPa

  • Increased number of profiles extending below 100 hPa

  • Cooling above 1 hPa between 65-90S


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T profiles – global averages data at ECMWF

4.-10.11.02

11.-17.11.02

MIPAS

ECMWF

Departures

MIPAS - EC

Improvement after 13.11.02


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MIPAS data at ECMWF

Time

11.11.

17.11.

Temperature (zonal means at 100 hPa): 11.-17.11.2002

More data at 100 hPa after 13.11.2002


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MIPAS Ozone data at ECMWF

  • Reasonable agreement with ECMWF ozone over large part

    of stratosphere

  • Some differences might be explained by known ECMWF model bias:

    e.g. – tropical O3 max. lower in ECMWF than MIPAS

    - 90-65ºN: ECMWF > MIPAS over large part of stratosphere

  • Unrealistically large MIPAS ozone values in lower stratosphere

    (cloud contamination ?)

    Upgrade on 13.11.2002, 12z:

  • Reduced departures (MIPAS – ECMWF) in lower stratosphere

  • Reduced number of unrealistically large MIPAS ozone values, but some large values remain


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4.-10.11.02 data at ECMWF

Ozone profiles: 0 – 20ºS

11.-17.11.02

ECMWF

MIPAS

Improvement after 13.11.02


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Ozone scatter plot (4.-10.11.02): 100-150 hPa data at ECMWF

Unrealistically large

values in tropics


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MIPAS - Water Vapour data at ECMWF

  • MIPAS water vapour values generally larger than ECMWF values (sign in agreement with known dry bias of ECMWF analyses in stratosphere)

  • Unrealistically large MIPAS water vapour values at bottom end of profiles (cloud contamination ?)

    Upgrade on 13.11.2002, 12z:

  • Reduced MIPAS water vapour values between 20-100 hPa

  • Fewer unrealistically large water vapour values at bottom end of profiles, but some large values remain


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MIPAS data at ECMWF

ECMWF

Water vapour profiles: 0-20ºS (11.-17.11.02)

Zonal mean MIPAS (60-80 hPa)

Change on 13.11.02

11.11.

Time

17.11.

Dry bias of ECMWF

Cloud contamination of MIPAS?


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Summary and data at ECMWFOutlook

  • Monitoring of Meteo products at ECMWF

  • SCIAMACHY: Values ca. 10% lower than ECMWF or GOME (KNMI) over large parts of globe

  • MIPAS: Profile values seem reasonable, possible cloud contamination at bottom of profiles

  • GOMOS: Worse data quality than MIPAS. Large scatter. Water vapour values unrealistically large.

  • Continuation of monitoring

  • Experimental assimilation of ENVISAT data

  • Please add geolocation information to L2 products


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