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Water vapour continuum in windows: Processing the recent MSF RAL measurements

Water vapour continuum in windows: Processing the recent MSF RAL measurements. Igor Ptashnik Dept. of Meteorology, University of Reading. 10 February 2011 Cambridge. Processing MSF RAL pure H 2 O measurements.

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Water vapour continuum in windows: Processing the recent MSF RAL measurements

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  1. Water vapour continuum in windows:Processing the recent MSF RAL measurements Igor Ptashnik Dept. of Meteorology, University of Reading 10 February 2011 Cambridge

  2. Processing MSF RAL pure H2O measurements Ptashnik, McPheat, Shine, Smith, Williams, submitted to J. Geophys. Res. Retrieved experimental self-continuum in windows is anorder of magnitudestronger than MTCKD in model. For 2500 cm-1 and 4600 cm-1 windows the disagreement increases with temperature, reaching a factor 25 at470 K.

  3. Temperature dependence. Simple analysis.

  4. Temperature dependence. Simple analysis.

  5. MSF RAL measurements(R. McPheat, K. Smith, G. Willaims) Foreign H2O measurements (foreign-continuum) 1) empty cell 2) Air (5 atm) - background 3) H2O + Air (total 5 atm) - sample 4) Air (5 atm) - background 5) empty cell

  6. MSF RAL measurements: H2O - Air Foreign H2O-Air continuum Is derived as: (RAL – UCLlines) – RALself-continuum CIA N2-N2 and O2-O2 contribution is subtracted by using Air as a background.

  7. Foreign continuum: H2O – Air 350 K 372 K Air Air 400 K Foreign H2O-Air continuum in near-IR windows is also an order of magnitude stronger than in MT_CKD-2.5 model!

  8. “Water vapour self-continuum and water dimers: 1. Analysisof recent work” IV Ptashnik, KP Shine, AA Vigasin, JQSRT, in press

  9. Water vapour self-continuum and water dimers: 2. ..... in preparation...

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