4 January 1995 Noise-related limits on the detectability of concentration variations of CH4 and CO with SCIAMACHY
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Abstract
We present results of a sensitivity analysis of CO and CH4 observations in the infrared with the spectrometer SCIAMACHY. 2D simulations of trace gas dispersion are used to predict the concentration distributions of the two target gases. Changes in the concentrations are converted into changes in incoming flux to the instrument by simulating the photon scattering through the atmosphere by using several radiative transfer programs, and the HITRAN database. The incoming flux is transferred to measured detector pixel counts and noise employing the SCIAMACHY instrument simulation software as developed in SRON. The computed noise is translated to uncertainties in the determination of concentrations using the Cramer-Rao formalism. We show that for earth albedo values above 10% and realistic noise values the CH4 concentrations can be determined with a precision better than 1%; for CO the error can be higher than 10% in unfavorable conditions. As a by-product, the sensitivities for measuring H2O and N2O are also given.
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Hans Schrijver, Sander Slijkhuis, Michiel G. M. Roemer, Albert P. H. Goede, "Noise-related limits on the detectability of concentration variations of CH4 and CO with SCIAMACHY", Proc. SPIE 2311, Atmospheric Sensing and Modelling, (4 January 1995); doi: 10.1117/12.198583; https://doi.org/10.1117/12.198583
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