International Archives of the Photogrammetry, Remote Sensing and Spatial Information Science, Volume XXXVIII, Part 8, Kyoto Japan 2010 
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Figure 7. Statistics of 110 0 3 coincidences compared with 52 
ENVISAT/MIPAS (MIPAS IML ver.40) observations at the 
55°N-65°N latitude region. 
4.2 HC1 
Figures 8 and 9 show example of coincidences with ACE-FTS 
ver 2.2 (Mahieu et al., 2008) and MLS ver. 2.2 (Froidevaux et 
al., 2008B), respectively. Figures 10 and 11 show the 
coincidence statistics of SMILES compared with ACE-FTS and 
MLS in the 55°N-65°N latitude region, respectively. As similar 
to 03 coincidence statistics, SMILES HC1 agreed quite well (< 
5%) with ACE-FTS and MLS at 20-40 km altitude region. 
SMILES HC1 value tends to be 20% smaller than ACE-FTS and 
MLS above 50 km. HC1 should be ~ 3.5 ppb based upon 
observations and model studies, and SMILES HC1 value (ver. 
0032) above 40 km should not be used for science. 
We think possible reasons that the SMILES HC1 value to be too 
low (~3.0 ppb) above 50 km could be instrumental 
characteristics; such as, AOS frequency resolution, AOS 
frequency scaling, calibration, etc. And HC1 value will be 
updated in the future release. 
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Figure 8. Example of HCI coincidence with ACE-FTS, at the 
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Figure 9. Example of HCI coincidence with AURA/MLS, at the 
event same as Figure 4. 
Figure 10. Statistics of HCI coincidence comparison with ACE- 
FTS at the 55°N-65°N region. 
Figure 11. Statistics of HCI coincidence comparison with 
Aura/MLS at the 55°N-65°N region. 
4.3 HN0 3 
Figure 12 shows a priori used for the ver. 0032 processing and 
sample retrieval results. A priori is prepared from AURA/MLS 
ver.2.2 monthly zonal mean (Santee et ah, 2007). MLS HNO3 
value is valid only up to 50 km, the retrieval error S clearly 
shows notch structure at the 50 km. By applying proper a priori 
constriction, we can retrieve HNO3 properly even at 30-60 km 
altitude region. 
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Figure 12. a priori used for the ver.0032 and retrieval results. 
Figures 13 and 14 show the examples of HNO3 coincidence 
with SCISAT-l/ACE-FTS ver.2.2 (Wolff et ah, 2008) and 
ENVISAT/MIPAS, MIPAS-IMK ver.40 (Von Clarmann et ah, 
2009), respectively. Figures 15 and 16 show coincidence 
statistics at the 55°N-65°N latitude region. SMILES HN0 3 
values are consistently higher, ~20%, than ACE-FTS and 
MIPAS. This is explained that the rotational quantum number 
dependence of pressure broadening parameter (Mencaraglia et 
ah, 2006) is not used for the SMILES ver.0032. HNO3 value of 
SMILES (ver.0032) and MLS (ver. 2.2) are quite similar since 
both do not include the rotational quantum number dependence 
of pressure broadening properly.