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Assimilation and validation

Assimilation and validation. Martin Juckes, BADC. ACE-FTS.

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Assimilation and validation

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  1. Assimilation and validation Martin Juckes, BADC

  2. ACE-FTS ACE-FTS is the main instrument on SCISAT-1. It is a high spectral resolution (0.02 cm-1) Fourier Transform Spectrometer (FTS) operating from 2.2 to 13.3 µm (750-4400 cm-1) with a Michelson interferometer that was custom designed and built by ABB-Bomem.

  3. Background: MIPAS vs. ACE-FTS Wang et al. (2007; ACP) show mean differences between ACE-FTS and MIPAS HNO3 of around 0.5ppbv, standard deviation around 1.

  4. Wang et al. – MIPAS vs. Odin The MIPAS – Odin differences are generally larger than the MIPAS – ACEFTS differences.

  5. Validation of assimilated fields Blue: HIRDLS, Green: ACE-FTS, Orange: MLS-AURA

  6. 500K Mean differences from assimilaton and standard deviation in 6 latitude bands and 12 months.

  7. 650K and 850K

  8. Equivalent latitude means (a) (b) (a) HIRDLS, (b) MLS-AURA

  9. (b) (a) (a) HIRDLS, (b) MLS-AURA

  10. Odin SMR (Orsolini et al., 2008, ACPD)

  11. N. hemisphere, 650K HIRDLS, HNO3 ECMWF, PV MLS-AURA, HNO3

  12. Closing remarks • Validation against ACE-FTS gives reasonable results: detailed analysis still needs to be done • The annual cycle is markedly different from that obtained by Orsolini et al. from ODIN SMR data, but consistent with MLS-AURA • Evolution of large scale structures broadly consistent with potential vorticity evolution

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