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首页> 外文会议>Remote Sensing of Clouds and the Atmosphere XII; Proceedings of SPIE-The International Society for Optical Engineering; vol.6745 >Characterization of tropical atmosphere through wide-band emission spectra acquired with a balloon-borne uncooled FTS spectroradiometer
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Characterization of tropical atmosphere through wide-band emission spectra acquired with a balloon-borne uncooled FTS spectroradiometer

机译：通过气球载非冷却FTS光谱仪获得的宽带发射光谱表征热带大气

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摘要

On June 30th, 2005 the REFIR-PAD (Radiation Explorer in the Far InfraRed - Prototype for Application and Development) Fourier transform spectroradiometer performed the first wide-band spectral characterization of the top-of-atmosphere emitted radiation in the far-infrared with an uncooled instrument. The nadir emitted radiance has been measured down to 100 cm~(-1), thus covering a spectral interval that, until now, was nearly unexplored, and up to 1400 cm~(-1), including the well characterized atmospheric window region, in which it is possible to perform comparison and intercalibration with operative instruments. The measurements were performed at an altitude of 34 km, from a stratospheric balloon launched in tropical region, near Teresina (Brazil). The acquired spectra have a spectral resolution of 0.5 cm~(-1). It should be noted that despite the operating spectral range extending to the far-infrared region, REFIR-PAD does not require any cooled components, thanks to the use of pyroelectric detectors and an optical scheme that compensates for the instrument self-emission. This work shows the results of the analysis of the spectra, focusing on the far infrared portion of the atmospheric emitted radiance. The retrieval of the vertical profiles of water vapour and temperature during the flight is presented. The vertical resolution of the retrieval is 2 km in the upper troposphere - lower stratosphere (UTLS) region, and lower at higher altitudes. The comparison with ECMWF for validation is also shown. Besides the characterization of temperature and water vapour, from the analysis of the emitted radiance useful information can be gathered about cloud and aerosol contribution to radiation budget.
机译：2005年6月30日，REFIR-PAD（远红外辐射探测器-应用和开发原型）傅里叶变换光谱辐射仪对远红外大气层顶部的辐射进行了首次宽带光谱表征，未冷却的仪器。测量到的最低辐射辐射低至100 cm〜（-1），因此涵盖了直到现在几乎尚未探测到的光谱间隔，一直到1400 cm〜（-1），包括特征明确的大气窗口区域，可以与手术器械进行比较和相互校准。这些测量是从巴西特雷西纳附近的热带地区发射的平流层气球在34 km的高度上进行的。所获得的光谱具有0.5cm〜（-1）的光谱分辨率。应当指出，尽管工作光谱范围扩展到了远红外区域，但由于使用了热释电检测器和补偿仪器自发光的光学方案，REFIR-PAD不需要任何冷却组件。这项工作展示了光谱分析的结果，重点是大气辐射辐射的远红外部分。提出了在飞行过程中水蒸气和温度的垂直剖面的检索。对流层的垂直分辨率在高对流层-低平流层（UTLS）区域为2 km，而在较高高度则较低。还显示了与ECMWF的比较以进行验证。除了表征温度和水蒸气外，还可以通过分析辐射的辐射来收集有用的信息，以了解云和气溶胶对辐射预算的贡献。

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