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GRAS SAF Software Deliverables

A comprehensive software package for pre-processing RO data, including functionality for assimilation in NWP systems. Users can customize and modify components to suit their needs. Beta-testing program available.

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GRAS SAF Software Deliverables

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  1. GRAS SAF Software Deliverables Sean Healy Dave Offiler Christian Marquardt

  2. Radio Occultation Processing Package - ROPP Objective: To provide Users with a comprehensive software package, containing all necessary functionality to pre-process RO data from CGS Level 1b files or GRAS SAF Level 2 files, plus RO-specific components to assist with the assimilation of these data in NWP systems.

  3. ROPP Strategy (1) • ROPP functionality will mirror aspects of the GRAS SAF operational data production chain, but will not be the same code. • Level 1b->Level 2 algorithms will be similar but not necessarily identical to those in the GRAS SAF operational processor. • Bit-compatibility between GRAS SAF Level 2 data and ROPP-processed equivalents is not to be expected.

  4. ROPP Strategy (2) • ROPP will not be a“black box” • It will be a suite of library functions and example applications (Fortran90 source code) for users to “pick’n’mix” • Users may modify or replace components in ROPP to suit existing local operational infrastructure • ROPP will be delivered in phases with a beta-testing programme involving interested users.

  5. ROPP Main Functions (1) • Ingest (Level 1b UT and Level 2 SAF & BUFR) • Pre-filtering / smoothing / interpolation • Co-ordinate transformations • Meteorological conversions • Date/time conversions • Forward operators (incl. Adjoints, T/Linear, Gradients)

  6. ROPP Main Functions (2) • 1-DVAR example implementation • Observation covariance matrix • Standalone test harnesses (incl. test input and example output files) • Full User Documentation

  7. ROPP Development • First release planned for Q1 2004, but with limited functionality (e.g. forward operators for Refractivity only) • Updated package with added and/or improved functionality to be released incrementally (schedule to be defined depending on user priorities) • Beta-testing programme foreseen - volunteers?

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