16 June 2003 Far infrared spectroscopy of the troposphere (FIRST): sensor concept
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FIRST (a NASA Instrument Incubator Program) is a balloon-based demonstration of a space-based sensor to measure the Earth’s thermal infrared at high spatial and spectral resolution. The radiative balance of the troposphere, and hence climate, is dominated by the infrared absorption and emission of water vapor, particularly at far-infrared (far-IR) wavelengths longer than 15 µm (650 cm-1), the distribution of water vapor and its far-IR radiative forcings and feedbacks are major uncertainties in understanding and predicting future climate. However, far-IR emission (spectra of band-integrated) has rarely been directly measured from space platforms. FIRST will be a Fourier Transform Spectrometer (FTS) with radiometric calibration in the spectral range from 10 to 100 µm (1000 to 100 cm-1) at 0.6 cm-1 unapodized resolution. It will incorporate a broad bandpass beamsplitters and a high-throughput optical and detector system. FIRST has a NEΔT performance goal of 0.2K from 10 to 100 µm. The spectral resolution will allow simultaneous retrievals of temperature and water vapor profiles. A 10 × 10 array of 10 km IFOVs is desired isolate clear and cloudy fields of view, while providing daily global coverage capability.
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Gail E. Bingham, Gail E. Bingham, Stanley J. Wellard, Stanley J. Wellard, Martin G. Mlynczak, Martin G. Mlynczak, David Geoffrey Johnson, David Geoffrey Johnson, Wesley A. Traub, Wesley A. Traub, Kenneth W. Jucks, Kenneth W. Jucks, } "Far infrared spectroscopy of the troposphere (FIRST): sensor concept", Proc. SPIE 4897, Multispectral and Hyperspectral Remote Sensing Instruments and Applications, (16 June 2003); doi: 10.1117/12.467705; https://doi.org/10.1117/12.467705

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