Assimilation and validation
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Assimilation and validation
Martin Juckes, BADC
ACE-FTSACE-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.
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.
Wang et al. – MIPAS vs. Odin
The MIPAS – Odin differences are generally larger than the MIPAS – ACEFTS differences.
Validation of assimilated fields
Blue: HIRDLS, Green: ACE-FTS, Orange: MLS-AURA
500K
Mean differences from assimilaton and standard deviation in 6 latitude bands and 12 months.
650K and 850K
Equivalent latitude means
(a) (b)
(a) HIRDLS, (b) MLS-AURA
(a) (b)
(a) HIRDLS, (b) MLS-AURA
Odin SMR (Orsolini et al., 2008, ACPD)
N. hemisphere, 650K
HIRDLS, HNO3 ECMWF, PV MLS-AURA, HNO3
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