Abstract
Abstract. The OSIRIS instrument onboard the Odin spacecraft routinely measures vertical profiles of spectrally dispersed, limb scattered sunlight from the upper troposphere into the lower mesosphere. These measurements are used to retrieve the ozone number density vertical profile using the SaskMART Multiplicative Algebraic Reconstruction Technique, which is a one dimensional modification of an existing two-dimensional tomographic retrieval algorithm. The retrieved profile extends from the cloud top to 60 km. In the absence of clouds the retrieval extends down to 10 km. This technique allows for the consistent merging of the absorption information from radiance measurements at wavelengths in the Chappuis and the Hartley-Huggins bands at each iteration of the inversion. The effectiveness of the retrieval is demonstrated using a set of coincident SAGE II occultation measurements that show a mean bias of less than 2% from 18 to 53 km.
Highlights
In recent years multiple satellite instruments have been developed that measure the spectrum of limb scattered sunlight at ultraviolet, visible and near-infrared wavelengths
In this work we present a new technique for the retrieval of ozone vertical profiles from 10 to 60 km using limb scatter radiances measured by the Optical Spectrograph and InfraRed Imaging System (OSIRIS) instrument
We demonstrate the success of this technique as applied to the OSIRIS measurements through comparison of these retrievals with near coincident Stratospheric Aerosol and Gas Experiment (SAGE) II occultation measurements
Summary
In this work we present a new technique for the retrieval of ozone vertical profiles from 10 to 60 km using limb scatter radiances measured by the OSIRIS instrument. In a fashion similar to the technique employed by Flittner et al (2000), measurement vector elements are formed using radiance profiles that are normalized at a reference tangent altitude. The measurement vector element is, yjk = ln I(j, λref) In this notation, Irepresents a normalized radiance profile and j denotes a measured tangent altitude, i.e. a line of sight. The multiplicative factor used to update the current atmospheric state at each altitude is a weighted average of all the ratios of observed and modelled measurement vector elements that are significant to the retrieved value. The ability to use multi-spectral information to retrieve the ozone at a single altitude is not unique to the SaskMART approach but it is essential for the successful merging of the Hartley-Huggins and Chappuis absorption band information
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