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Presentation on the OMPS Nadir Mapper Ozone Profile Mixing Ratio Limits

Presentation on the OMPS Nadir Mapper Ozone Profile Mixing Ratio Limits. DR #7310 Introduction.

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Presentation on the OMPS Nadir Mapper Ozone Profile Mixing Ratio Limits

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  1. Presentation on theOMPS Nadir MapperOzone Profile Mixing Ratio Limits

  2. DR #7310 Introduction The algorithm compares the measurement residuals and ozone obtained by using the standard mid latitude LUT with those from the standard high latitude LUT. A value is computed to "mix" the two cases to generate the ozone that would theoretically lead to a zero residual. If the residuals bracket zero then this is just an interpolation. If the residuals have the same sign, then an extrapolation takes place. If the two residual values are also close in size, then this extrapolation can go beyond reasonable limits. Further since the residuals can be produced by factors other than real profile shape errors, the process can respond to calibration errors or atmospheric constituents and produce poor results. We have  identified some simple limit checks that can be placed in the code to restrict the extrapolation.

  3. Current OMPS OOTCO Mixing Fractions for 20150501

  4. Description of the Approach 4) Calculate the mixing fraction (limit it to -0.5 to 1.5): fm = Res1/(Res1 – Res2) If fm > 1.5 then fm =1.5 if fm < -0.5 then fm =-0.5 5) Calculate ozone using this mixing fraction: Code changes to ozmix.f !         -- Calculate mixing fraction using triplet residues to give zero residues.           if (abs(adjres1-adjres2).gt.0.0001) then prf = adjres1 / (adjres1-adjres2)  !         -- Do not allow extrapolation more than 0.5 steps away.              if (prf.lt.-0.5) prf=-0.5              if (prf.gt.1.5) prf=1.5 prfrac = prf endif

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