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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 >Sensitivity of passive measurements in VIS, SWIR and TIR to cirrus microphysical vertical profile: application to cloud remote sensing from MODIS
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Sensitivity of passive measurements in VIS, SWIR and TIR to cirrus microphysical vertical profile: application to cloud remote sensing from MODIS

机译：VIS，SWIR和TIR中被动测量对卷云微物理垂直剖面的敏感性：从MODIS应用于云遥感

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摘要

For inferring cirrus optical and microphysical properties from satellite imagery, a common assumption is that the radiative properties of a cirrus cloud may be represented by those associated with a specific ice crystal habit, a single particle size distribution and Ice Water Content (IWC). Various algorithms have been developed to retrieve cirrus optical and microphysical properties in the past 20 years. They can be categorized into the techniques based on either thermal infrared or solar reflection measurements. However, in-situ measurements have shown that shapes, sizes and IWC of ice crystals may vary substantially with height within the clouds. Given the different sensitivity of thermal infrared and solar wavelength to cloud microphysics, it is unlikely that a single cloud layer with homogeneous cloud properties can be used to reproduce both type of measurements. Thus, it is necessary to assess the effect of vertical inhomogeneity within cirrus on the radiative transfer calculations and on the retrieval techniques. The purpose of this study is to investigate a microphysical cirrus model composed of different layers in terms of ice crystal habit, size and IWC. The vertical structure will be given by simple analytic formula derived from various prescribed physical constraints. The primary goal of this study is to determine a simple cloud model that can be used to retrieve consistent information from both solar and thermal measurements. For this purpose, we examine the sensitivity of cirrus reflectances and brightness temperature to its vertical description for a suite of MODIS (MODerate-resolution Imaging Spectroradiometer) bands spanning visible, near infrared and thermal infrared wavelengths. Results of this study are presented and potential application to remote sensing of cirrus clouds with MODIS are discussed.
机译：为了从卫星图像推断卷云的光学和微观物理特性，通常的假设是卷云的辐射特性可以由与特定冰晶习性，单个粒度分布和冰水含量（IWC）相关的那些来表示。在过去的20年中，已经开发出各种算法来检索卷云的光学和微物理特性。可以将它们归类为基于热红外或太阳反射测量的技术。但是，现场测量表明，冰晶的形状，大小和IWC可能会随着云层内的高度而发生很大变化。鉴于热红外和太阳波长对云微物理的敏感性不同，具有均一云特性的单个云层不太可能用于再现这两种类型的测量结果。因此，有必要评估卷云中垂直不均匀性对辐射传输计算和检索技术的影响。这项研究的目的是研究由冰晶习性，大小和IWC组成的不同层组成的微物理卷云模型。垂直结构将通过从各种规定的物理约束条件得出的简单解析公式给出。这项研究的主要目标是确定一个简单的云模型，该模型可用于从太阳和热测量中检索一致的信息。为此，我们检查了卷云反射率和亮度温度对其在垂直，近红外和热红外波长范围内的MODIS（中等分辨率成像光谱仪）波段套件的垂直描述的敏感性。介绍了这项研究的结果，并讨论了利用MODIS进行卷云遥感的潜在应用。

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