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NORS/NDACC UV-VIS Working Group Meeting Brussels, 04.07.2012. NORS WP4: Advanced characterisation of NORS data products. Andreas Richter, Folkard Wittrock and the WP4 Team. Institute of Environmental Physics and Institute of Remote Sensing University of Bremen.

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NORS/NDACC UV-VIS Working Group Meeting

Brussels, 04.07.2012

NORS WP4: Advanced characterisation of NORS data products

Andreas Richter, Folkard Wittrock

and the WP4 Team

Institute of Environmental Physics and

Institute of Remote Sensing

University of Bremen

main objectives of nors wp4
Main Objectives of NORS WP4

“Ensure that the products provided by NORS are tailored so that the data can be used directly as validation data in the GMES atmospheric service (= GAS = MACC-II).”

  • Harmonization of data in terms of format and contents
  • Full characterisation of data with respect to integration volume, resolution, and sensitivity
  • Full description of uncertainties
  • Comparison to satellite data used for assimilation in GAS
changes to current ndacc uv vis approach
Changes to current NDACC UV/vis approach

Application of NDACC UV/vis data in GAS necessitates important changes in approach:

Data of interest

  • Both stratospheric and tropospheric column amounts, profiles and surface concentrations

Data formats

  • Common GEOMS HDF/netCDF format for all instruments and products

Data provision

  • NRT or within a few weeks, not months / years

Uncertainties

  • Detailed error budget needed for assimilation system

Application

  • Automated use for daily validation
structure of nors wp4
Structure of NORS WP4

Task 4.1 Data Formats

Task 4.2 Information Content and Harmonization of Networks / Techniques

Task 4.3 Uncertainties

Task 4.4 Comparison to Satellite Observations

structure of wp4
Structure of WP4

Task 4.1 Data Formats

  • Collection of current formats and contents
  • Iteration with data providers and GAS
  • Harmonisation of data files following GEOMS (Generic Earth Observation Metadata Standard)
  • Definition of new formats by all data providers for WP3 and WP7. If needed, development of conversion tools

=> GEOMS standards will beapplied

ULg, UBremen, BIRA-IASB, INTA, UBern, KIT, CNRS, MPIC, UH, S&T

structure of wp41
Structure of WP4

Task 4.2 Information Content and Harmonization of Networks / Techniques

  • Characterisation of vertical sensitivity and resolution
  • Analysis of horizontal displacement and averaging using different RTMs
  • Development of CH4 retrievals for NDACC and TCCON using overlapping windows
  • Standardisation of retrieval settings
  • Comparison of periods with parallel measurements of same quantity using different NORS techniques
  • Documentation of procedures and results

U. Bremen, BIRA-IASB, INTA, UBern, KIT, CNRS, ULg, MPIC, UH

structure of wp42
Structure of WP4

Task 4.3 Uncertainties

  • Collection of existing error assessments
  • Execution of additional sensitivity studies and theoretical uncertainty estimates
  • Consistent documentation of results
  • Recommendation for harmonized uncertainty reporting

KIT, U Bremen, BIRA-IASB, INTA, UBern, CNRS, ULg, MPIC, UH

structure of wp43
Structure of WP4

Task 4.4 Comparison to Satellite Observations

  • Evaluation of existing studies comparing satellite and NORS type data
  • Definition of validation approach and protocol
  • Execution of additional comparisons where possible and needed
  • Report on consistency

INTA, UBremen, BIRA-IASB, INTA, UBern, KIT, CNRS, ULg, MPIC, UH

summary
Summary
  • With NORS, a small subset of NDACC UV/vis stations will move to
    • Rapid data delivery
    • Use of GEOMS formats
    • Detailed measurement and error characterisation
    • Comparison between different NDACC measurement systems
  • As a result, data will be much more applicable for use in data assimilation and model / satellite data validation
  • It is foreseen to extend this approach to other stations after the project if resources are available

=> If successful, the NORS approach will substantially enhance the usability of NDACC UV/vis data and hopefully open an opportunity for future funding through link to the operational GAS service

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