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Page 1© Crown copyright 2005 The Radio Occultation Processing Package GRAS-SAF Team (Axel von Engeln), August 2005 GPSRO2, Lansdowne, Virginia
Page 2© Crown copyright 2005 Introduction
Page 3© Crown copyright 2005 ROPP Objectives To provide users with a comprehensive software package, containing all necessary functions 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. Implemented as a set of pick’n’mix modules. Some 3 rd party freeware support libraries required (e.g. netCDF, udunits, Lapack)
Page 4© Crown copyright 2005 ROPP Background Partly follows the AAPP idea (ATOVS and AVHRR Pre-processing Package / NWP-SAF) Developed within the GRAS-SAF at the Met Office Aims at Operational Meteorological Centers Also allows stand alone processing
Page 5© Crown copyright 2005 ROPP Context GRAS Level 1b (CGS) PFS netCDF pfs2ropp GRAS Level 2 (SAF) ropp2bufr BUFR ropp_1dvarropp_fm NWP VAR system NWP User netCDF ropp_preproc ropp_qc
Page 6© Crown copyright 2005 ROPP Facts Portability built-in (tested with several Unix/Linux compilers) Installation uses standard configure, make, make install sequence Maintained under SVN version control ROPP is NOT a black box, standalone, end-to-end processor but a modular system providing the required (possibly distributed) functions.
Page 7© Crown copyright 2005 Modules
Page 8© Crown copyright 2005 ROPP Modules (1) ropp_tools Utility Library (unit conversions, interfaces etc) ropp_io IO Library (bufr, netCDF, conversions) ropp_fm Forward Library, T/L & Adjoints for bending angles or refractivity (hybrid, pressure & height based)
Page 9© Crown copyright 2005 ROPP Modules (2) ropp_1dvar 1DVar Library (Minimiser, Q/C) ropp_ug User Guide
Page 10© Crown copyright 2005 ROPP Future Modules ropp_preproc Pre-processing Library from Level 1b to Level 2 (Version2: Abel transform, thinning, coordinate transforms, Version3: FSI) ropp_qc Quality control Libraries ropp_fm 2-D Bending Angle (hybrid, pressure & height based)
Page 11© Crown copyright 2005 ROPP Examples
Page 12© Crown copyright 2005 ROPP Examples: Information content Tropical profile, w/ and w/o inflated background errors above 5 hPa, for various uncorrelated bending angle noise levels
Page 13© Crown copyright 2005 ROPP Examples: 1K Altitude One order of magnitude in noise reduction ~ 15 km in altitude.
Page 14© Crown copyright 2005 ROPP: Surface Pressure Retrieval Surface pressure retrieval increments. Small inconsistency in altitude reference (top) and modified (bottom).
Page 15© Crown copyright 2005 Acknowledgments / Contacts Acknowledgments: Met Office (Dave Offiler) Met Office / EUMETSAT (Christian Marquardt) Met Office / ECMWF (Sean Healy) Contacts: Web:
Page 16© Crown copyright 2005 Questions & Answers
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