ASSET MEETING (Météo-France, France, 19-21 January 2005):

Attendance: Dominique Fonteyn, Frank Daerden (BIRA-IASB, Belgium), William Lahoz (UREADMY/DARC, UK), David Jackson (Met Office, UK), Niels Bormann (ECMWF, UK), Henk Eskes (KNMI, The Netherlands), Hendrik Elbern (U. Köln, Germany), Simone Ceccherini (CNR.IFAC, Italy), Aasmund Vik, Terje Krognes (NILU, Norway), Thomas von Clarmann (IMK Karlsruhe, Germany), Marco Ridolfi (UNIBOL, Italy), Olivier Talagrand (LMD, France), Boris Khattatov (Fusion Numerics, USA), Donal Murtagh (Chalmers, Sweden), Martin Juckes (RAL, UK), Slimane Bekki, Marion Marchand (UPMC, France), Eric Brun, Daniel Cariolle, Vincent-Henri Peuch, Bernard Chapnik, Jean Pailleux, Laaziz El Amraoui, Helene Manzoni, Stéphanie Pradier (Météo-France, France), Sebastien Massart (CERFACS, France), Jean-Marie Flaud, Jean-Luc Attié (LISA, France), Matthias Beekman (CNRS, France), Claus Brüning (EC).

21st January:

William Lahoz (WL): Overview of ASSET. ASSET partners are making a mark in various ways: invited presentations, Envisat cal-val, summer schools, papers and public awareness.

WL proposed that the next ASSET meetings be held in June 2005 in Köln. However, there will be a SPARC Data Assimilation workshop in Banff, Canada (12th-16th September 2005), and ASSET partners are encouraged to attend. An ISSI-funded meeting during late 2005 or early 2006 was proposed. The date would depend on whether ASSET gets a 6-month no-cost extension. The final ASSET meeting would probably be held in Reading or Exeter, the date depending on whether ASSET gets a no-cost extension.

WL discussed the ASSET ozone intercomparison project. He provided details of early runs from UREADMY/DARC. Alan Geer, who is running this project, is currently spending two months holidaying in Antarctica (due back mid February 2005).

  

Henk Eskes (HE1): HE1 discussed the ASSET ozone intercomparison project. He suggested ASSET-related publications on the following topics: ozone assimilation intercomparisons; Cariolle scheme and other representations of ozone chemistry; SCIAMACHY NO2 columns; KNMI/ECMWF SCIAMACHY ozone columns; use of data assimilation for cal-val. A brief overview of the status of SCIAMACHY validation was presented. More information can be found in http://www.sciamachy-validation.org.

Aasmund Vik (AV) and Terje Krognes (TK): AV and TK presented an overview of data management.

WL: WL then discussed the following: (i) Proposal for an ASSET extension; (ii) ISSI proposal; (iii) future meetings (ASSET and other).

20th January:

Olivier Talagrand (OT): OT presented a comparison of sequential and variational assimilation approaches. Advantages and disadvantages of each were highlighted.

Bernard Chapnik (BC): BC presented recent work (involving OT) on diagnosing error.

Martin Juckes (MJ): MJ presented an alternative approach to data assimilation. The idea is to avoid using information from the background error covariance matrix.

Daniel Cariolle (DC): DC presented recent work on the Cariolle linear chemistry scheme.  A number of parametrization improvements have been implemented, including the addition of heterogeneous chemistry.

Boris Khattatov (BK): BK presented recent work on ionospheric data assimilation.

David Jackson (DJ): DJ discussed the work at the Met Office toward the assimilation of stratospheric humidity.

WL: WL discussed results from a study of the Ozone hole split of September 2002, assimilating MIPAS ozone data.

Niels Bormann (NB): NB presented the latest results from the assimilation of MIPAS limb radiances at ECMWF.

Vincent-Henri Peuch (VHP): VHP introduced work carried at MF (see next 4 presentations).

Sebastien Massart (SM): SM discussed the MOCAGE-PALM platform, and its use to assimilate MIPAS ozone data.

Laaziz El Amraoui (LEA): LEA discussed the assimilation of ODIN/SMR ozone data for the period Nov 2002 - Mar 2003 (NH winter 2002-03, for which there was a VINTERSOL campaign).

Helene Manzoni (HM): HM compared the assimilation of ozone data into the 3d-FGAT and 4d-var (incremental) approaches using the MOAGE-PALM system.

Stéphanie Pradier (SP): SP discussed the assimilation of MIPAS ozone data into the MOCAGE-PALM system.

Jean-Luc Attié (JLA): JLA discussed assimilation of MOPITT tropospheric CO data into MOCAGE.

HE1: HE1 discussed the 2003 and 2004 Antarctic ozone holes. HE1 presented results on the assimilation and cal-val of SCIAMACHY limb ozone profiles. The SCIAMACHY NO2 retrieval (tropospheric columns are markers of pollution and biomass burning) was  discussed.

Slimane Bekki (SB): SB discussed the MIMOSA model and how it is used for assimilation. An update of GOMOS datasets was provided: for 2003 there is 1 year of data available of ozone, NO2 and NO3. This could be used to evaluate the analyses from the ASSET ozone intercomparison project. SB discussed recent work on the extraction of temperature information from the GOMOS NO3 and ozone data, and on the assimilation of UARS MLS ozone data into the MIMOSA system.

Dominique Fonteyn (DF): DF discussed recent results toward the assimilation of aerosols; aerosols/PSC validation; assimilation of water vapour; and assimilation of novel MIPAS products from CNR-IFAC.

Hendrik Elbern (HE2): HE2 discussed the assimilation system at UKOELN used for tropospheric data assimilation. The data to be assimilated include: ozone profiles derived using neural networks (GOME); NO2 column (GOME); aerosols (GOME/SCIAMACHY and (A)ATSR).

Matthias Beekman (MB): MB discussed the use of assimilation to study tropospheric air quality.

Thomas von Clarmann (TC): TC discussed progress in producing non-standard MIPAS retrievals to be used by UKOELN. The MIPAS profiles extend to the troposphere (but not the lowermost troposphere). TC mentioned that data assimilation could help interpret the non-standard MIPAS data.

Simone Ceccherini (SC) and Marco Ridolfi (MR): SC and MR presented results from the non-standard MIPAS data retrieved at CNR-IFAC (ORM algorithm; 1-d retrieval) and U. Bologna (GMTR algorithm; 2-d retrieval).