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首页> 外文会议>Sensors, systems, and next-generation satellites XIV >Tracking long-term stability of the response versus angle for the MODIS thermal emissive bands with observations over clear ocean
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Tracking long-term stability of the response versus angle for the MODIS thermal emissive bands with observations over clear ocean

机译：跟踪MODIS热发射带响应与角度的长期稳定性，并在晴朗的海洋上进行观测

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摘要

This study uses observed brightness temperatures (BT) over clean ocean to track the stability of the on-orbit response versus scan angle (RVS) for the thermal emissive bands (TEB) of the MODIS (the Moderate Resolution Imaging Spectroradiometer) instrument onboard Aqua and Terra spacecraft. The stability is examined by tracking the BT difference between those obtained at each scan angle and the scan angle of the view for the onboard blackbody. Over two thousands granules over the Atlantic Ocean for Terra and Aqua MODIS are used. Cloudy pixels within each granule are excluded to improve trending quality and consistency. The BT trends are derived at 13 angles of incidence (AOI) over the entire Aqua and Terra missions. Results show that the relative changes in BT for the long-wave infrared bands are within a few tenths of a degree, equivalent to 0.5 to 1.0%, while those for a few middle-wave infrared bands still show large fluctuations due to their high sensitivity to atmospheric water vapor contents. A comparison with trends obtained using measured BT for instrument interior cavity shows that both results are in good agreement. The BT differences between two mirror sides at each scan angle are also derived to examine the consistency of the RVS results.
机译：这项研究使用了在干净的海洋上观测到的亮度温度（BT）来跟踪水上和水上MODIS（中分辨率成像光谱仪）仪器的热发射带（TEB）的在轨响应稳定性与扫描角（RVS）的关系。 Terra宇宙飞船。通过跟踪在每个扫描角度获得的值与车载黑体的视图扫描角度之间的BT差来检查稳定性。大西洋上有超过两千个用于Terra和Aqua MODIS的颗粒。排除每个颗粒中的浑浊像素，以改善趋势质量和一致性。在整个Aqua和Terra任务中，BT趋势是从13个入射角（AOI）得出的。结果表明，长波红外波段的BT相对变化在十分之一度以内，相当于0.5％至1.0％，而中波红外波段的BT相对变化由于其高灵敏度而仍然显示出较大的波动。到大气中的水蒸气含量。与使用仪器内部腔体的测得BT所获得的趋势进行比较表明，两个结果吻合良好。还得出了在每个扫描角度下两个镜面之间的BT差异，以检查RVS结果的一致性。

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