MIPAS Retrievals

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MIPAS Retrievals at Oxford A Dudhia HIRDLS
Science Team Meeting Oxford 26/27 June 2008
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ENVISAT

• ESA Satellite
• Payload of 10 instruments
• monitoring the earths
• surface and atmosphere
• Launched 1st March 2002
• Sun Synchronous Orbit
• Period 101 minutes
• ? 14.25 Orbits per day

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MIPAS

• Fourier Transform Spectrometer
• Spectrum 685-2410cm-1 at 0.025cm-1 resolution in
  4.5s
• Limb scan in 17 steps from 68-6km in 85s
  (500km)
• 72 profiles per orbit
• 1000 profiles per day

Michelson Interferometer for Passive Atmospheric
Sounding
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Major Species
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MIPAS

• July 2002 - March 2004 full resolution
  (0.025cm-1)
• ESA L2 products of pT,O3,H2O,HNO3,CH4,N2O,NO2
• Widely used by other groups for additional
  products
• Jan 2005 - present reduced resolution
  (0.0625cm-1)
• Limited ESA L2 dataset released for validation
• Operational L2 data now expected end of 2008
• ESA L1B data (spectra) available 2 week
  latency
• Dec 2007 back up to full-time operation (from
  35 in 2005)
• Feb 2008 L1B NRT data available hours latency
• Envisat funded to 2010 - possibly extended until
  2014

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Atmospheric Spectrum
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MIPAS Spectrum _at_0.025cm-1
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MIPAS Spectrum _at_0.0625cm-1
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Oxford L2 Processing

• Uses MORSE
• Optimal estimation retrieval code (ie robust)
• ESA products (using same microwindows as ESA)
• Additionally CFC-11, CFC-12, N2O5, ClONO2, CO(?)
• Currently three processing streams running at
  Oxford
• Since Jun 07 all recent off-line data
• Since Sep 07 all 2002-2007 data in parallel
  with current
• Since Mar08 NRT data (pT, O3 and H2O only)
• Aim to have a complete MIPAS dataset Jul02-
  completed by Jul/Aug 2008

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Summary

• ESA L2 MIPAS Data
• Jul02-Mar04
• pT, H2O, O3, HNO3, CH4, N2O, NO2
• Jan05- data expected end 2008
• Oxford L2 MIPAS Data
• Jul02-Mar04 and Jan05-present
• Species as ESA, plus F11,F12,ClONO2, N2O5,CO
• www.atm.ox.ac.uk/group/mipas/