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Recent MIPAS L2 Data Retrieved at Oxford Anu Dudhia University of Oxford

Recent MIPAS L2 Data Retrieved at Oxford Anu Dudhia University of Oxford. Oxford processor MORSE uses same L1B/microwindows as ESA data, but optimal estimation algorithm. Now also processing NRT data (available ~ hours after acquisition) - only NOM mode pT, H2O and O3

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Recent MIPAS L2 Data Retrieved at Oxford Anu Dudhia University of Oxford

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  1. Recent MIPAS L2 DataRetrieved at OxfordAnu DudhiaUniversity of Oxford

  2. Oxford processor MORSE uses same L1B/microwindows as ESA data, but optimal estimation algorithm. • Now also processing NRT data (available ~ hours after acquisition) - only NOM mode pT, H2O and O3 • ~hours: NRT L1B Data available • 2 days: NRT Oxf L2 Data completed • 2 weeks: OFL L1B Data available • 3 weeks: OFL Oxf L2 Data completed http://www.atm.ox.ac.uk/group/mipas/L2OXF/

  3. Temperature 10mb

  4. Temperature 65S-90S 10mb

  5. Temperature 20S-20N 10mb

  6. Temperature 65N-90N 10mb

  7. NO2 65N-90N 1mb

  8. Winter 2007/2008 Conclusions • No obvious problems with MIPAS retrievals • Dynamically: series of major stratospheric warmings during Jan/Feb (including 40K in 4 days Jan 19-23) but quiet since March • Chemically: fairly ‘standard’ winter

  9. Comparison of NRT and “Off-Line’’ Data • Identical OXF L2 processing used for both • Since NRT data started on 19 Feb 08 and latest OFL data completed for 24 Feb 08, only 6 days overlap so far

  10. L1B NRT Data • Produced since 19 Feb 08 • Usually available within a couple of hours of acquisition from Kiruna (8/9 orbits) or ESRIN (5/6 orbits) ftp sites • Deleted approximately 10 days after acquisition • Some disruption in flow during ATV mission but basically robust

  11. L1B NRT Data Anomalies • Frequent duplicate orbits from ESRIN (but not Kiruna) • One second time difference compared with OFL data (OFL sweep 1.000010 seconds later than NRT) • Occasionally NUM_SWEEPS_PER_SCAN=+00028 (instead of expected value +00027) • Know bug - should be fixed with IPF 5.00 • All AB band spectra flagged as corrupt in one orbit (31912, 7Apr08) • Missing update of MIP_CO1 auxiliary file

  12. L1B Altitude

  13. L1B Altitude

  14. L1B Altitude

  15. Temperature

  16. Pressure

  17. H2O

  18. O3

  19. NRT Data - Conclusions • L1B NRT data production generally robust • Spectral shift is main distinction between NRT and OFL L1B Data • No significant bias in L2 data, but scatter ~noise random error from spectral shift.

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