1 / 8

Status of WP4: FTIR measurements

Status of WP4: FTIR measurements. M. De Mazière (BIRA-IASB) K. Petersen, T. Warneke, J. Notholt (U. Bremen). Ground-based FTIR network. WP4: Observations from ground networks. From DoW WP4:.

odette
Télécharger la présentation

Status of WP4: FTIR measurements

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Status of WP4: FTIR measurements M. De Mazière (BIRA-IASB) K. Petersen, T. Warneke, J. Notholt (U. Bremen)

  2. Ground-based FTIR network

  3. WP4: Observations from ground networks

  4. From DoW WP4: • Perform solar absorption measurements in the mid-infrared spectral region at the 7 European NDACC stations (28°N to 80°N), throughout the duration of the project, at a minimal frequency of about 1 meas./week And perform measurements at tropical stations duringcampaigns • Optimise the retrieval of CH4 in the mid-infrared spectral region • Evaluate the error budget of CH4 and N2O vertical profiles • Provide a consistent set of total column densities and vertical profiles of CH4 and N2O for model evaluation and satellite validation • Validate and calibrate the SCIAMACHY and IASI satellite measurements

  5. Status at KO For CH4 • Set of retrieval microwindows defined for profile retrieval • DOF  3 • Relative error on tropo- column  10% For N2O • 2 Sets of retrieval microwindows defined for profile retrieval • DOF  4.5 • Relative error on tropo- column  5 to 10% For both: Consistent timeseries at UFTIR stations (excl. tropical and ship-borne data) BUT: • Error budget ? In part. for CH4: accuracy?Cf.uncertainties on spectroscopic params. • Lack of data in tropics

  6. (To be) done in HYMN • Continuation of measurements at the European NDACC sites : ongoing • Analysing past data at tropical stations and performing new measurement campaigns in the tropics: ongoing, esp. at Paramaribo and Ile de La Réunion • agreement to perform and report pressure measurements and/or pressure data from weather stations. • Optimisation of the total column and profile retrievals of CH4 in the mid-IR: • Analysis of new microwindow options (all) • CH4 cell measurements (Univ. Bremen and IMK-Karlsruhe) to define spectroscopic parameters  results expected by July 2007 • NCEP/ECMWF data: KNMI provides ECMWF data to test sensitivity of retrieval to T-profile

  7. (To be) done in HYMN (cont’d) • Retrieval strategy: to be homogenized as much as possible from station to station. • Provision of a consistent set of total column densities and vertical profiles of CH4 and N2O for model evaluation and satellite validation. • By September 2007: submission of preliminary historical time series in HYMN database; focus on 2004; if possible, extend from 2003 to 2006 • Archived parameters, metadata and data format have been decided: = individual profile data + averaging kernels in HDFv4.3 format, inline with AVDC guidelines • Evaluation of the error budget of vertical profile data (CH4 and N2O): while fixing retrieval strategy

  8. (To be) done in HYMN (cont’d) • Comparisons FTIR –Model: • every group will do the comparison for its own sites! • Model data will be provided in separate files for each site (each day at 12h LT or 10-16h LT mean) • Do the modelers need info as to timing of FTIR measurements ? • Comparisons FTIR – satellite • Via model and direct FTIR-satellite • Need fro dry-air column averaged VMR ? Test at tropical stations. Next meeting in October 2007

More Related