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GOME-2 FM202-2: PM2 Slit function analysis

GOME-202-2 slit function analysis PM2 Part 3: Retrieved Slit R. Siddans, B. Latter, B. Kerridge RAL Remote Sensing Group 26 th June 2012 RAL. GOME-2 FM202-2: PM2 Slit function analysis. Linearly mapped error analysis for FM202-2 Dominant error – wavelength registration?

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GOME-2 FM202-2: PM2 Slit function analysis

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  1. GOME-202-2 slit function analysisPM2Part 3: Retrieved SlitR. Siddans, B. Latter, B. KerridgeRAL Remote Sensing Group26th June 2012RAL

  2. GOME-2 FM202-2: PM2Slit function analysis • Linearly mapped error analysis for FM202-2 • Dominant error – wavelength registration? • Note larger Echelle angular range used cf. 2004 • Gaussian broadening more significant on 0.5mm (expected) • New vs. old • 0.5mm +/-10% • 1.0mm +/-20% • Codes in plots: FM202-{ver}_{slit_width}_{order}[g] • {ver} : 1= 2004, 2 = 2012 • {slit_width} : _1_0 = 1mm, _0_5 = 0.5mm • {order} : (not present)=main order, _1=overlapping • “g”= SFS Gaussian broadened

  3. SFS shape Order 1mm / 0.5mm New / old 1mm New 1mm/old 0.5mm

  4. SFS shape New (GB)/Old 0.5mm New (no GB)/Old 0.5 Old 1mm Order Old 1mm /0.5mm

  5. Conclusions • Large change in FPA1,3,4 slit functions • Some change in FPA2 • Wavelength registration for FM202-2 still dominant error source (FM202-1 more consistent) • SFS shape significant (particularly 0.5mm slit) • Impact on O3 profile? Wls error dominated? • Need to improve wavelength information: • Remove extreme Echelle angel data? • Retrieve?

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