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Using GPS Radio Occultation Data Operationally at NOAA: Plans and Issues

Using GPS Radio Occultation Data Operationally at NOAA: Plans and Issues. James G. Yoe NOAA/NESDIS Office of Research and Applications (ORA) Climate Research and Applications Division (CRAD) james.g.yoe@noaa.gov M.K. Rama Varma Raja Information Management Systems Group (IMSG). Overview.

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Using GPS Radio Occultation Data Operationally at NOAA: Plans and Issues

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  1. Using GPS Radio Occultation Data Operationally at NOAA: Plans and Issues James G. Yoe NOAA/NESDIS Office of Research and Applications (ORA) Climate Research and Applications Division (CRAD) james.g.yoe@noaa.gov M.K. Rama Varma Raja Information Management Systems Group (IMSG)

  2. Overview • Activities Past & Present • Anticipated GPS/RO Applications • Operational Issues Foreseen • Plans for Addressing Issues • Summary

  3. NOAA Participants • NESDIS/ORA and Office of Systems Development • J. Yoe, Rama Varma Raja, J. Silva, and D. McGinnis, • NESDIS/CIMSS • Eva Borbas and Paul Menzel • Integrated Program Office for NPOESS • Stephen Mango • National Centers for Environmental Prediction - NCEP • Stephen Lord, John Derber, D. Keyser, and Mel Gelman • Joint Center for Satellite Data Assimilation - JCSDA • NCEP plus NASA’s J. Joiner and P. Poli

  4. Early NOAA GPS/RO • Initial NIH (“Not Invented Here”) reaction, but • Interest in complementary sounding grew • All weather, Vertical Resolution, Accuracy • Possibilities for climate application • Lack of conventional upper level soundings • Potential for Numerical Weather Prediction Vertical coverage, number, computational cost (Matsumura, et al, 1999)

  5. Recent/Current Emphasis • Workshop, Washington DC May 2000 • Support development of operational missions • NPOESS/GPSOS and METOP/GRAS • Requirements, reviews/TIMS, OAT and IFCT • Support for external missions • COSMIC (CDAAC development support) • Product development • Borbas et al, 2003 – Combined T and e soundings • Prototype mission assessment on-going • GPS/MET, OERSTED, SAC-C, CHAMP (next slides)

  6. Compare to GPS/MET with median cut-off height ~ 500 mb. Improved HW, firmware, and software have extended vertical coverage for RO. Note that Kuo et al (2003) still find enhanced refractivity bias (against model predictions) below 5 km. Depth of RO Soundings Achieved by CHAMP

  7. Operational Applications • Climate Monitoring, Analysis, & Prediction • NWS/NCEP/CPC and NESDIS/STAR SCMD • Explore upper stratospheric temperature trends • Investigate refractivity as a climate data record • Satellite Data Calibration and Validation • NESDIS/ORA/CRAD • Intercomparisons of GPS/RO and radiometric soundings • Numerical Weather Prediction • NWS/NCEP/EMC and JCSDA • Assimilation and Impact assessment

  8. Operational Issues • CRITICAL issues are TEMPORAL • Affected Application is NWP • Receiving and formatting (BUFR) of data in time for model cycle inclusion • Cost in computational time • First operational missions are imminent • GRAS - 2005 • COSMIC - 2005

  9. Actions Planned (I) • GPS/RO team formed at JCSDA • NASA/DAO, NCEP, NESDIS • POCS – Joiner, Derber, Yoe • Collaboration with UCAR and the NSF • Three Young Scientists to be hired • RO Modeling (Dr. Lidia Cucurull 04/01/03) • RO/advanced sounder specialist at JCSDA • Advanced sounder/RO specialist at UCAR • All to interact closely • End-to-end GPS/RO data assimilation, error characterization, impact assessment

  10. Actions (II) • GPS/RO Workshop Planned • Washington, DC Area • October 28 – 30, 2003 (to be confirmed) • Point of Contact: james.g.yoe@noaa.gov • General Announcement by e-mail this month • WebPage will be set-up to keep info current • Purpose is to advance, accelerate, and optimize operational usage of GPS/RO for NWP

  11. WS Goals • Science • Emphasize robustness/stability, documentation • Avoid “academic” diversions • Engineering • Emphasize efficiency and stability of IT, communications, data handling • Welcome GRAS, European participation • At workshop and beyond

  12. Summary • Considerable scientific, technical, and programmatic progress has been made world-wide with GPS/RO • Varied products/applications anticipated • Bending angles, N (NWP) • T, N (Climate) • Moisture products (Inter-satellite cal/val) • Critical issue now is preparation for effective use • Especially for NWP • Efficient collaboration & exchange

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