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Variational Cloud Decontamination for IASI Measurements of Atmospheric Parameters

This study presents a novel variational cloud-decontamination prototype that integrates the measurement of partially cloudy spectra observed by the IASI (Infrared Atmospheric Sounding Interferometer). It outlines the method for retrieving clear component spectra by combining linear approximations of clear and cloudy components. Furthermore, it assesses the atmospheric parameters derived from decontaminated spectra. The methodology is demonstrated with measured spectra from four IASI fields of view, enhancing the accuracy of atmospheric analysis in cloudy conditions.

orla-herring
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Variational Cloud Decontamination for IASI Measurements of Atmospheric Parameters

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  1. Clear component Measurement Partially cloudy adjacent IASI fields of view(FOV) Variational cloud-decontamination prototype Cloudy component Decontaminated spectrum Atmospheric parameters Cloud decontamination scheme Each measured spectrum (black) is the linear combination of clear (blue) and cloudy (red) components. Measured spectra for the 4 IASI fields of view are given as input of the cloud-decontamination process, which provides the clear component spectrum, and the corresponding retrieved atmospheric parameters. NOV-30XX-SL-XXX

  2. AVHRR analysis j=1,J RTM Scguessj (j=1,J) ajk , qjk , qk (j=1,J: k=1,K) Spectral correction algorithm k=1,K eik (k=1,K) Sok (k=1,K) + i=1,It Seik (k=1,K) Variational cloud-clearing algorithm ajk (j=1,J: k=1,K) j=1,J Scij (j=1,J) Spectral correction algorithm NOV-30XX-SL-XXX

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