STEAM KO Meeting Swedish Space Corporation Stockholm, 6 June 2003

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STEAMKO MeetingSwedish Space Corporation
Stockholm, 6 June 2003

• Jolyon Reburn
• Remote-Sensing Group
• Atmospheric Science Division
• Space Science and Technology Department

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Content

• Scientific Experience
• Remote Sensing Group
• Technical Expertise
• Millimetre Technology Group

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Scientific Experience

• Remote Sensing Group
• Development and application of radiative transfer
  models and retrieval schemes for satellite and
  airborne remote-sensors
• Wavelength range from UV through IR to mm-wave
• Diverse viewing geometries (nadir-, limb- and
  slant-)
• Processing, validation and scientific
  interpretation of data
• Retrieval simulations to define and optimise new
  sensors

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Scientific Experience

• Previous Work
• Simulation Studies for ESA
• Initial MASTER SOPRANO Studies
• ACECHEM Requirements Study
• Data Analysis
• 500 GHz airborne receiver
• GOME ozone profiling
• ISAMS NO NO2

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Scientific Experience

• Current Work
• Simulation Studies
• ESA UTLS Study
• Eumetsat GOME-2 Study
• CAPACITY (ESA Earthwatch Study)
• Data Analysis
• MARSCHALS
• TELIS
• MIPAS
• SCIAMACHY/AATSR

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MASTER Bands
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Tomographic Limb Sounding

• The UTLS region is characterised by large
  vertical and horizontal gradients in O3 and H2O

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Tomographic Limb Sounding

• Traditionally limb-sounder data analysis
  (retrieval) assumes atmospheric spherical
  symmetry

• at best, the retrieved profiles represent some
  average of the truth
• at worst, retrievals are compromised by
  inconsistencies between observed and modelled
  atmosphere
• Tomographic limb-sounding addresses these problems

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Iterative 2-D Retrieval Simulations

• H2O (MASTER band C)
• Retrieval started from flat field

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2-D/1-D retrieval comparison

• MASTER Band C H2O

1-D retrieval, profiles retrieved independently,
atmosphere assumed spherically symmetric
2-D retrieval
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2-D Linear simulations

• MASTER band B O3
• Systematic errors show impacts of
• Instrument errors e.g. pointing, radiometric,
  antenna knowledge
• Model errors e.g. temperature

Random (noise) errors Individual systematic
errors (coloured lines) Total systematic
errors Total errors
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Tomographic Limb Sounding

• 2-D radiative transfer scheme successfully
  developed and applied for MASTER and MIPAS
  simulations
• 2-D retrieval scheme implemented
• Multiple limb scans inverted simultaneously
• Novel methods (e.g. matrix manipulation)
  developed to reduce memory requirements
• 2-D iterative retrievals for realistic
  atmospheres
• 2-D linear diagnostics to characterise errors
• UTLS H2O, O3 and other constituents can be
  retrieved successfully in 2-D cloud-free
  simulations

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MIPAS GOME Synergy

• Standard a priori for RAL scheme(Fortuin
  Kelder uniform trop).

South AtlanticAnomaly
1012molecules/cm3

• After info from GOME Huggins bands.
• Trop. lower (c.f. Strat. Bias.)
• SAA !

Latitude
Orbit on23/08/02
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Issues

• If platform resources can be increased ?
• Some ideas could be imported from ACECHEM
• MetOp tandem flying limb-nadir synergy with
  IASI GOME-2
• Antenna HPBW
• SSB receivers at 300, 325, 345 GHz
• Broad bandwidths to discriminate spectral baseline