The Far-INfrarEd Spectrometer for Surface Emissivity (FINESSE) – Part 1: Instrument description and level 1 radiances

IF 3.2 3区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Measurement Techniques Pub Date : 2024-08-19 DOI:10.5194/amt-17-4757-2024

Jonathan E. Murray, Laura Warwick, Helen Brindley, Alan Last, Patrick Quigley, Andy Rochester, Alexander Dewar, Daniel Cummins

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Abstract

Abstract. The Far-INfrarEd Spectrometer for Surface Emissivity (FINESSE) instrument combines a commercial Bruker EM27 spectrometer with a front-end viewing and calibration rig developed at Imperial College London. FINESSE is specifically designed to enable accurate measurements of surface emissivity, covering the range 400–1600 cm−1, and, as part of this remit, can obtain views over the full 360° angular range. In this part, Part 1, we describe the system configuration, outlining the instrument spectral characteristics, our data acquisition methodology, and the calibration strategy. As part of the process, we evaluate the stability of the system, including the impact of knowledge of blackbody (BB) target emissivity and temperature. We also establish a numerical description of the instrument line shape (ILS), which shows strong frequency-dependent asymmetry. We demonstrate why it is important to account for these effects by assessing their impact on the overall uncertainty budget on the level 1 radiance products from FINESSE. Initial comparisons of observed spectra with simulations show encouraging performance given the uncertainty budget.

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地表发射率远红外光谱仪（FINESSE）--第 1 部分：仪器说明和 1 级辐射量

摘要表面发射率远红外光谱仪（FINESSE）将商用布鲁克 EM27 光谱仪与伦敦帝国学院开发的前端观察和校准装置结合在一起。FINESSE 专为精确测量表面发射率而设计，测量范围为 400-1600 cm-1，并且可以获得 360° 角范围内的全视角。在本部分（第一部分）中，我们将介绍系统配置，概述仪器的光谱特性、数据采集方法和校准策略。在此过程中，我们将评估系统的稳定性，包括黑体（BB）目标发射率和温度知识的影响。我们还建立了仪器线形（ILS）的数值描述，它显示出强烈的频率不对称。我们通过评估这些效应对 FINESSE 1 级辐射率产品的总体不确定性预算的影响，说明了为什么必须考虑这些效应。观测光谱与模拟的初步比较显示，在不确定性预算的情况下，观测光谱的性能令人鼓舞。

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来源期刊

Atmospheric Measurement Techniques METEOROLOGY & ATMOSPHERIC SCIENCES-

CiteScore

7.10

自引率

18.40%

发文量

331

审稿时长

3 months

期刊介绍： Atmospheric Measurement Techniques (AMT) is an international scientific journal dedicated to the publication and discussion of advances in remote sensing, in-situ and laboratory measurement techniques for the constituents and properties of the Earth’s atmosphere. The main subject areas comprise the development, intercomparison and validation of measurement instruments and techniques of data processing and information retrieval for gases, aerosols, and clouds. The manuscript types considered for peer-reviewed publication are research articles, review articles, and commentaries.