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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Development of a Multispectral Albedometer and Deployment on an Unmanned Aircraft for Evaluating Satellite Retrieved Surface Reflectance over Nevada’s Black Rock Desert
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Development of a Multispectral Albedometer and Deployment on an Unmanned Aircraft for Evaluating Satellite Retrieved Surface Reflectance over Nevada’s Black Rock Desert

机译：开发多光谱反射计并部署在无人飞机上以评估内华达州黑岩沙漠卫星获取的地面反射率

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Bright surfaces across the western U.S. lead to uncertainties in satellite derived aerosol optical depth (AOD) where AOD is typically overestimated. With this in mind, a compact and portable instrument was developed to measure surface albedo on an unmanned aircraft system (UAS). This spectral albedometer uses two Hamamatsu micro-spectrometers (range: 340–780 nm) for measuring incident and reflected solar radiation at the surface. The instrument was deployed on 5 October 2017 in Nevada’s Black Rock Desert (BRD) to investigate a region of known high surface reflectance for comparison with albedo products from satellites. It was found that satellite retrievals underestimate surface reflectance compared to the UAS mounted albedometer. To highlight the importance of surface reflectance on the AOD from satellite retrieval algorithms, a 1-D radiative transfer model was used. The simple model was used to determine the sensitivity of AOD with respect to the change in albedo and indicates a large sensitivity of AOD retrievals to surface reflectance for certain combinations of surface albedo and aerosol optical properties. This demonstrates the need to increase the number of surface albedo measurements and an intensive evaluation of albedo satellite retrievals to improve satellite-derived AOD. The portable instrument is suitable for other applications as well.
机译：美国西部地区明亮的表面导致卫星衍生的气溶胶光学深度（AOD）的不确定性，通常会高估AOD。考虑到这一点，开发了一种紧凑且便携式的仪器来测量无人机系统（UAS）上的地表反照率。该光谱反照率仪使用两个Hamamatsu微型光谱仪（范围：340–780 nm）来测量表面的入射和反射太阳辐射。该仪器于2017年10月5日部署在内华达州的黑岩沙漠（BRD）上，调查一个已知具有高表面反射率的区域，以便与人造卫星的反照率产品进行比较。结果发现，与安装了UAS的测斜仪相比，卫星取回低估了表面反射率。为了突出卫星反射算法对AOD的表面反射率的重要性，我们使用了一维辐射传输模型。该简单模型用于确定AOD相对于反照率变化的灵敏度，并表明对于表面反照率和气溶胶光学特性的某些组合，AOD取回对表面反射率的灵敏度较高。这表明需要增加地表反照率测量的数量，并需要对反照率卫星取回进行深入评估，以改善源自卫星的AOD。便携式仪器也适用于其他应用。

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