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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: Email: email@example.com Web: http://www.metoffice.gov.uk/research/interproj/grassaf/index.html
Page 16© Crown copyright 2005 Questions & Answers
1 © Crown copyright 2003 GRAS SAF User Workshop Helsingør, Denmark, June 2003 GRAS SAF Software Deliverables Sean Healy Dave Offiler Christian Marquardt.
11 GRAS SAF Status & Next Steps Kent B. Lauritsen Danish Meteorological Institute Copenhagen, Denmark Contents - Short introduction to the GRAS SAF.
Slide 1 Second GPS/RO Users Workshop, August , The EUMETSAT Polar System GRAS SAF and Data Products Martin B. Sorensen GRAS SAF Project Atmosphere.
GRAS SAF AND RADIO OCCULTATION DATA K. B. Lauritsen 1, H. Gleisner 1, M. E. Gorbunov 2, F. Rubek 1, S. Syndergaard 1, H. Wilhelmsen 1 (1) Danish Meteorological.
1 © Crown copyright 2003 GRAS SAF User Workshop Helsingør, Denmark, June 2003 WMO BUFR Format for NRT Dissemination of RO Data Dave Offiler.
Forecast impact experiments with CHAMP RO measurements Sean Healy Acknowledgements Jean-Noël Thépaut, Sami Saarinen, Niels Bormann, Lars Isaksen, Adrian.
1 3D-Var assimilation of CHAMP measurements at the Met Office Sean Healy, Adrian Jupp and Christian Marquardt.
© Crown copyright Met Office Recent progress in the application of GPSRO data at the Met Office Michael Rennie, OPAC 2010 Workshop, 07/09/10.
Assimilation experiments with CHAMP GPS radio occultation measurements By S. B. HEALY and J.-N. THÉPAUT European Centre for Medium-Range Weather Forecasts,
2 nd GRAS-SAF USER WORKSHOP Assimilation of GPS radio occultation measurements at DAO (soon GMAO) P. Poli 1,2 and J. Joiner 3 Data Assimilation Office.
Sean Healy Presented by Erik Andersson
GPS radio occultation Sean Healy DA lecture, 28th April, 2008.
ECMWF reanalysis using GPS RO data Sean Healy Shinya Kobayashi, Saki Uppala, Mark Ringer and Mike Rennie.
CGMS-40, November 2012, Lugano, Switzerland Coordination Group for Meteorological Satellites - CGMS IROWG - Overview of and Plans for the Newest CGMS Working.
Different options for the assimilation of GPS Radio Occultation data within GSI Lidia Cucurull NOAA/NWS/NCEP/EMC GSI workshop, Boulder CO, 28 June 2011.
Status of the assimilation of GPS RO observations: the COSMIC Mission L. Cucurull JCSDA/UCAR J.C. Derber, R. Treadon, and R.J. Purser.
11 GRAS SAF Climate Products Hans Gleisner & Kent B. Lauritsen Danish Meteorological Institute Contents -GRAS SAF offline profiles and climate gridded.
Use of GPS RO in Operations at NCEP
ASSIMILATION of Limb measurements at ECMWF: GPS radio occultation
ROSA GRAS Meeting February 2009 Matera, Italy GRAS Monitoring and Validation GRAS EUMETSAT (contact:
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