1 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder OVERVIEW OF EUMETSAT RADIO OCCULTATION ACTIVITIES Axel von Engeln, Christian Marquardt, Yago Andres
Overview EUMETSAT Mission Overview EUMETSAT Reprocessing GRUAN vs. COSMIC Recent Observations on GRAS Processing Failures Conclusion 2 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
EUMETSAT Mission Overview EUMETSAT involved in: Mandatory Program: EPS EPS-SG Optional Program: Jason-CS EPS is Europe's contribution to the Initial Joint Polar System (IJPS) established with NOAA EPS-SG will be part of the NOAA/EUMETSAT Joint Polar System (JPS) Service 3 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder Jason-CS is planned to embark the COSMIC-2 TriG, NRT processing at UCAR, Offline at UCAR/EUM
EUMETSAT Mission Overview: EPS & EPS-SG Schedule Commissioning Opera.onal 2043 2042 2041 2040 2039 2038 2037 2036 2035 2034 2033 2032 2031 2030 2029 2028 2027 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 Metop A Metop B Metop C Metop- SG A1 Metop- SG B1 Metop- SG A2 Metop- SG B2 Metop- SG A3 Figure Peter Schluessel, EUMETSAT Metop- SG B3 RO will fly on EPS-SG A & B satellites, initially observing GPS & Galileo, with potential observation of GLONASS, BeiDou in the future (all on L1, L5). Requirement of 1100 occultations / day / satellite for GPS and Galileo. Follow on of GRAS instrument. 4 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
EUMETSAT Reprocessing Info Currently running a reprocessing of Metop-A and -B data up to end 2014 Data formats (netcdf4, ROPP tools), GO processing finalized Fine tuning of FSI (or PM) ongoing (on L1, L2, over all altitudes) Based on in-house prototype Early delivery of Metop-A GO data for ECMWF ERA-CLIM in July and to ROTrends Full data set, including documentation available early 2015 Next step is reprocessing of CHAMP, COSMIC,... from level 0. Available later 2015 Some early validation plots of GO data on next slides 5 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
EUMETSAT Reprocessing Stats: ECMWF Validation of GRAS Metop-A data vs. ECMWF fcts and ERA-I analysis, May 2013: oper. NRT, repro, UCAR GRAS repro, UCAR COSMIC repro. Bias (left), std. dev. (middle), robust weight (right, indicating number of outliers).notes: (1) EUM NRT, Repro only GO, thus lowest 8km grey shaded; (2) bias, std dev ripples at higher altitude due to ECMWF model resolution (reduced with updated ROPP); (3) UCAR does a more rigorous QC 6 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
EUMETSAT Reprocessing Stats: Matches Matches of Metop-A and Metop-B within 3h/300km with COSMIC data. Near-Real- Time and Reprocessing shown. Bias (left), std. dev. (middle), robust weight (right, indicating number of outliers). Notes: (1) EUM NRT, Repro only GO, thus lowest 8km grey shaded; (2) M-A NRT uses different on-board tracking parameters to M-B, and different lower troposphere processing. 7 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
EUMETSAT Reprocessing Stats: Data Consistency Validation of GRAS reprocessed data against ECMWF ERA-I analysis for Months of January. Bias (left), std. dev. (middle), robust weight (right, indicating number of outliers). Notes: (1) EUM NRT, Repro only GO, thus lowest 8km grey shaded; (2) bias, std dev ripples at higher altitude due to ECMWF model resolution (reduced with updated ROPP) 8 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
GRUAN vs. COSMIC Stats: GRUAN Background GCOS is establishing a reference network for upper-air climate observations (GRUAN). GRUAN is expected to provide long-term, highly accurate measurements of the atmospheric profile, complemented by ground-based state of the art instrumentation, to constrain and calibrate data from more spatiallycomprehensive global observing systems (inc. satellites and current radiosonde networks), in order to fully characterize the properties of the atmospheric column and their changes. From: http://www.wmo.int/pages/prog/gcos/index.php?name=gruan Primarily use RS92 Vaisala sondes, with an upgrade to RS41 within the next 2 years expected High resolution data Cover mostly 2010 onwards 9 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
GRUAN vs. COSMIC Stats: Setup Using version 002 of GRUAN data Using COSMIC reprocessed data Using ECMWF operational 12h forecasts at RO position Matching within 1h/100km to 5h/500km Using location at 10km sonde profile, mean tangent point of RO 10 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
GRUAN vs. COSMIC Stats: Impact of Non-Ideal Gas Refractivity GRUAN vs. COSMIC/UCAR reprocessed matches for ideal and non-ideal gas compressibility, bias (left), std. dev. (middle), robust weight (right, indicating the number of outliers in the statistics). Limited period covered. 11 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
GRUAN vs. COSMIC Stats: Refractivities Refractivity validation of GRUAN vs. matched reprocessed COSMIC/UCAR or ECMWF forecast at RO location, bias (left), std. dev. (middle), robust weight (right, indicating the number of outliers in the statistics). 12 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
GRUAN vs. COSMIC Stats: Refractivity Annual Stability Refractivity validation of GRUAN vs. matched reprocessed COSMIC/UCAR or ECMWF forecast at RO location for different years, bias (left), std. dev. (middle), robust weight (right, indicating the number of outliers in the statistics). 13 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
GRUAN vs. COSMIC Stats: Temperatures Temperature validation of GRUAN vs. matched reprocessed COSMIC/UCAR (dry) or ECMWF forecast at RO location, bias (left), std. dev. (middle), robust weight (right, indicating the number of outliers in the statistics). 14 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Background Recently noted an increased number of failures in GRAS processing to level 1B, from around 4% to up to 8%. Level 1B data also shows increased noise Was observed on Metop-A and Metop-B Was observed for different processing lines Points to common cause Monitoring environment re-checked, no issues found GPS orbit/clock data checked, no issues found 15 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Processing Failures: Metop-A 16 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Conclusions EUMETSAT programs to cover RO > 2040 Reprocessing GRAS data set available early 15, COSMIC, CHAMP late 15 GRUAN - COSMIC Validation non-ideal gas compressibility improves refractivity fit refractivity differences < 0.2% bias stable over last 4 years dry temp differences < 0.3K bias (12-30km), inconclusive GRAS increased Failure Rates in March 14 mostly caused by L2 tracking problem potentially due to ionospheric effects has this been observed by other instruments? 17 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Coordina.on Group for Meteorological Satellites - CGMS IROWG- 4 Workshop W. F. E. Liardet (1830) Copyright held by State Library of Victoria IROWG-4 will be hosted at the Bureau of Meteorology and the Centre for Australian Weather and Climate Research in Melbourne, Victoria, Australia from 16th to 22nd of April 2015. More info on IROWG Mailing List and the IROWG website: http://www.irowg.org.
Backup/Ionosphere Discussion Slides 19 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Processing Failures: Metop-B 20 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Increased Noise Levels in L1B, Metop-A 21 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Geographical Distribution, Metop-A 22 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Instrument Noise Level, L1 C/A SNR 23 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Instrument Noise Level, L1 C/A S-Power 24 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Instrument Noise Level, L1 C/A N-Power 25 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Additional Info, ROM SAF Failure Pattern 2013 For information only, pattern of refractivity processing failures, as available from ROM SAF Operations Report 2013 H2. We generally note similar patterns in our failures. 26 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Additional Info: NPD on L2 Rising For information only, noise power density (NPD) pattern of the Metop-A GRAS rising L2 channel in Sep 2007. 27 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Failures: Next Steps Find cause and potentially improve processing 28 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder
Reprocessing Stats / ROTrends Info May 2013 period (Metop-A without onboard patch, Metop-B with), robust bias (left), standard deviation (middle) and weight (right) for operational and reprocessed Metop- A and -B, rising (top), setting (bottom), geometric optics, only CL. 29 Eighth FORMOSAT-3/COSMIC Data Users' Workshop, Sep/Oct 2014, Boulder