Information and disturbances contained in the reflected solar radiation spectra measured with space-borne Fourier transform spectrometer for greenhouse gas mapping

Tadao Aoki; Tatsuya Yokota; Gen Inoue; Koji Nobuta; Akira Kotani

doi:10.1117/12.693840

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22 December 2006 Information and disturbances contained in the reflected solar radiation spectra measured with space-borne Fourier transform spectrometer for greenhouse gas mapping

Tadao Aoki, Tatsuya Yokota, Gen Inoue, Koji Nobuta, Akira Kotani

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Proceedings Volume 6405, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications; 640506 (2006) https://doi.org/10.1117/12.693840
Event: SPIE Asia-Pacific Remote Sensing, 2006, Goa, India

Abstract

For measuring weak radiations with high spectral resolution, the Fourier Transform Spectrometer (FTS) is a powerful tool by virtue of its multiplex advantage. When we use this advantage for measuring Earth-reflected solar radiations from a moving satellite in space, however, we encounter a difficulty that during the acquisition of the interferogram, the optical characteristics of instantaneous filed of view (IFOV) could change. The change of IFOV radiance is caused by, e.g., the fluctuation of line-of-sight of the spectrometer, the change of reflection angle, the glittering of the water surface, or other causes. In this paper, we examine the effects of such pseudo signals contained in the interferograms on resultant spectra and retrieval accuracies of CO₂. Simulations showed that such pseudo signals could generate serious errors in CO₂ retrieval with the FTS of the GOSAT (Greenhouse Gases Observing Satellite). A method is shown to correct these types of disturbances on the interferograms. Together with these topics, we also discuss about other issues such as the ability of the measuring system of GOSAT-FTS to resolve the vertical density profiles of gases or the method to avoid the uncertainty of the existing data for high resolution spectra of solar radiance spectra.

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Tadao Aoki, Tatsuya Yokota, Gen Inoue, Koji Nobuta, and Akira Kotani "Information and disturbances contained in the reflected solar radiation spectra measured with space-borne Fourier transform spectrometer for greenhouse gas mapping", Proc. SPIE 6405, Multispectral, Hyperspectral, and Ultraspectral Remote Sensing Technology, Techniques, and Applications, 640506 (22 December 2006); https://doi.org/10.1117/12.693840

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