ISSI WG on H 2 O Bern, Switzerland Feb , 2008 Contribution to GEO-CEOS ? Contacts: Jean-Christopher LAMBERT and Bojan BOJKOV aeronomy.be, nasa.gov A possible contribution of the ISSI WG on Atmospheric H 2 0 to GEO-CEOS WGCV activities

ISSI WG on H 2 O Bern, Switzerland Feb , 2008 Contribution to GEO-CEOS ? H 2 0 contributes to several Societal Benefit Areas as defined by the GEO

ISSI WG on H 2 O Bern, Switzerland Feb , 2008 Contribution to GEO-CEOS ?  GEO Task DA assigned to CEOS WGCV Committee on EO Satellites: WG on Calibration and Validation:  Relevant topics: Characterisation and Classification of Cal/Val Sites Satellite and In Situ Cal/Val Data Access Methodology and Guidelines for Cal/Val Harmonisation of Quality Information

ISSI WG on H 2 O Bern, Switzerland Feb , 2008 Contribution to GEO-CEOS ?  No ISO-type standards for validation  Mostly "traditional practices"  "Best practices" depend on:  Atmospheric species  Atmospheric state, measurement conditions  Measurement technique  Target user of validation results  Target user of observation data  Resources for validation Establishing Best Practices in Atmospheric Composition Cal/Val Current Status

ISSI WG on H 2 O Bern, Switzerland Feb , 2008 Contribution to GEO-CEOS ?  Characterise data and sites => fact sheets  For every technique, identify (published or commonly agreed) best practices for data comparison and for satellite validation  Define own data quality strategy, data policy, data access, operational status  The ISSI book might be an excellent reference document for/endorsed by CEOS.  Relevant information to appear also on CEOS Cal/Val portal Establishing Best Practices in Atmospheric Composition Cal/Val Contribution of ISSI WG on H 2 O?

ISSI WG on H 2 O Bern, Switzerland Feb , 2008 Contribution to GEO-CEOS ? Annex 1: Tentative list of generic H 2 O data users Instrument and calibration scientists Geophysical validation of satellite observations Developers of retrieval algorithm (first guess and covariance, sensitivity studies…) Radiative transfer: atmospheric correction (IVOS), climate forcing (GHG)… Chemistry: heterogeneous chemistry, source of OH, reservoirs, diurnal cycles… Dynamics Microphysics Evaluation of CT modelling and data assimilation: R&D, operational verification GMES-like service (validation) scientists Independent audit of GMES-like services and of their validation International organisations: SPARC, WMO, EMEP…

ISSI WG on H 2 O Bern, Switzerland Feb , 2008 Contribution to GEO-CEOS ?  Annex 2: Generic timeliness of data delivery and quality classes Class 1: <3-6 hours, NRT Q: NRT verification of forecasts Class 2: <one month, NRT Q: stability of uncertainties Class 3: < 3-6 months, NRT/best Q: mid-term assessment Class 4: best Q: accurate validation after every cycle of one year and after every processor upgrade