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The ACE-FTS (Atmospheric Chemistry Experiment – Fourier TransformSpectrometer) instrument on the Canadian SCISAT satellite, which has been inoperation for over 12 years, has the capability of deriving stratosphericprofiles of many of the NOy (N + NO + NO2+ NO3+ 2 ×  N2O5+ HNO3+ HNO4+ ClONO2+ BrONO2)species. Version 2.2 of ACE-FTS NO, NO2, HNO3, N2O5, andClONO2 has previously been validated, and this study compares the mostrecent version (v3.5) of these five ACE-FTS products to spatially andtemporally coincident measurements from other satellite instruments – GOMOS,HALOE, MAESTRO, MIPAS, MLS, OSIRIS, POAM III, SAGE III, SCIAMACHY, SMILES,and SMR. For each ACE-FTS measurement, a photochemical box model was used tosimulate the diurnal variations of the NOy species and the ACE-FTSmeasurements were scaled to the local times of the coincident measurements.The comparisons for all five species show good agreement with correlativesatellite measurements. For NO in the altitude range of 25–50 km, ACE-FTStypically agrees with correlative data to within −10 %.Instrument-averaged mean relative differences are approximately −10 %at 30–40 km for NO2, within ±7 % at 8–30 km for HNO3,better than −7 % at 21–34 km for local morning N2O5, andbetter than −8 % at 21–34 km for ClONO2. Where possible, thevariations in the mean differences due to changes in the comparison localtime and latitude are also discussed

atmospheric measurement techniques

Validation of ACE-FTS version 3.5 NO&amp;lt;sub&amp;gt;&amp;lt;i&amp;gt;y&amp;lt;/i&amp;gt;&amp;lt;/sub&amp;gt; species profiles using correlative satellite measurements