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首页> 外文期刊>Applied optics >Use of high-resolution measurements for the retrieval of temperature and gas-concentration profiles from outgoing infrared spectra in the presence of cirrus clouds
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Use of high-resolution measurements for the retrieval of temperature and gas-concentration profiles from outgoing infrared spectra in the presence of cirrus clouds

机译：在存在卷云的情况下使用高分辨率测量值从传出的红外光谱中检索温度和气体浓度曲线

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We explore ways in which high-spectral-resolution measurements can aid in the retrieval of atmospheric temperature and gas-concentration profiles from outgoing infrared spectra when optically thin cirrus clouds are present. Simulated outgoing spectra that contain cirrus are fitted with spectra that do not contain cirrus, and the residuals are examined. For those lines with weighting functions that peak near the same altitude as the thin cirrus, unique features are observed in the residuals. These unique features are highly sensitive to the resolution of the instrumental line shape. For thin cirrus these residual features are narrow (≤0.1 cm~(-1)), so high spectral resolution is required for unambiguous observation. The magnitudes of these unique features are larger than the noise of modern instruments. The sensitivities of these features to cloud height and cloud optical depth are also discussed. Our sensitivity studies show that, when the errors in the estimation of temperature profiles are not large, the dominant contribution to the residuals is the misinterpretation of cirrus. An analysis that focuses on information content is also presented. An understanding of the magnitude of the effect and of its dependence on spectral resolution as well as on spectral region is important for retrieving spacecraft data and for the design of future infrared instruments for forecasting weather and monitoring greenhouse gases.
机译：当存在光学稀薄的卷云时，我们探索高光谱分辨率的测量方法可以帮助从传出的红外光谱中检索大气温度和气体浓度曲线。包含卷云的模拟出站光谱与不包含卷云的光谱拟合，然后检查残差。对于那些具有与稀薄卷云相同高度的峰的加权函数的线，在残差中观察到独特的特征。这些独特的功能对仪器线形的分辨率高度敏感。对于薄的卷云，这些残留特征很窄（≤0.1cm〜（-1）），因此要进行清晰的观测需要很高的光谱分辨率。这些独特功能的幅度大于现代乐器的噪音。还讨论了这些特征对云层高度和云层光学深度的敏感性。我们的敏感性研究表明，当温度曲线估算中的误差不大时，对残差的主要贡献是对卷云的误解。还提出了针对信息内容的分析。了解影响的大小及其对光谱分辨率以及光谱区域的依赖性，对于检索航天器数据以及设计未来的用于预测天气和监测温室气体的红外仪器至关重要。

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    《Applied optics》 |2003年第12期|共11页
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