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This study introduces stratospheric and mesospheric hydroperoxyl radical(HO2) estimates from the Aura Microwave Limb Sounder (MLS) using anoffline retrieval (i.e. run separately from the standard MLS algorithm). Thisnew data set provides two daily zonal averages, one during daytime from 10 to0.0032 hPa (using day-minus-night differences between 10 and 1 hPa toameliorate systematic biases) and one during nighttime from 1 to 0.0032 hPa.The vertical resolution of this new data set varies from about 4 km at10 hPa to around 14 km at 0.0032 hPa. A description of the methodologyand an error analysis are presented. Comparisons against the Whole AtmosphereCommunity Climate Model (WACCM), the Superconducting Submillimeter-WaveLimb-Emission Sounder (SMILES) and the Far Infrared Spectrometer (FIRS-2)measurements, as well as photochemical simulations, demonstrate therobustness of the retrieval and indicate that the retrieval is sensitiveenough to detect mesospheric HO2 layers during both day and night. Thisnew data set is the first long-term HO2 stratospheric and mesosphericsatellite record and it provides needed constraints to help resolve the O3deficit problem and the "HOx dilemma"

Stratospheric and mesospheric HO&lt;sub&gt;2&lt;/sub&gt; observations from the Aura Microwave Limb Sounder

Stratospheric and mesospheric HO<sub>2</sub> observations from the Aura Microwave Limb Sounder