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We present vertical profiles of hydrogen chloride (HCl) and chlorine monoxide(ClO) as observed by the Superconducting Submillimeter-Wave Limb-EmissionSounder (SMILES) on the International Space Station (ISS)inside the Antarctic vortex on 19–24 November 2009. The SMILES HCl valuereveals 2.8–3.1 ppbv between 450 K and 500 K levels in potential temperature(PT). The high value of HCl is highlighted since it is suggested that HClis a main component of the total inorganic chlorine (Cly),defined as Cly ≃ HCl + ClO + chlorine nitrate (ClONO2), inside theAntarctic vortex in spring, owing to low ozone values. To confirm the qualityof two SMILES level 2 (L2) data products provided by the Japan AerospaceExploration Agency (JAXA) and Japan's National Institute of Information andCommunications Technology (NICT), vis-à-vis the partitioning ofCly, comparisons are made using other satellite data from the Aura MicrowaveLimb Sounder (MLS) and Atmospheric Chemistry Experiment Fourier TransformSpectrometer (ACE-FTS). HCl values from the SMILES NICT L2 product agree towithin 10% (0.3 ppbv) with the MLS HCl data between450 and 575 K levels in PT and with the ACE-FTS HCl databetween 425 and 575 K. The SMILES JAXA L2 product is 10 to 20%(0.2–0.5 ppbv) lower than that from MLS between 400 and700 K and from ACE-FTS between 500 and 700 K. For ClO in daytime, thedifference between SMILES (JAXA and NICT) and MLS is lessthan ±0.05 ppbv (100 %) between 500 K and 650 K withthe ClO values less than 0.2 ppbv. ClONO2 values as measured by ACE-FTSalso reveal 0.2 ppbv at 475–500 K level, resulting in the HCl / Cly ratios of0.91–0.95. The HCl / Cly ratios derived from each retrievalagree to within −5 to 8 % with regard to their averages. The high HCl valuesand HCl / Cly ratios observed by the three instruments in the lowerstratospheric Antarctic vortex are consistent with previous observations inlate Austral spring

HCl and ClO profiles inside the Antarctic vortex as observed by SMILES in November 2009: comparisons with MLS and ACE-FTS instruments