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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Determination of Cloud Optical Thickness Over Snow Using Satellite Measurements in the Oxygen A-Band
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Determination of Cloud Optical Thickness Over Snow Using Satellite Measurements in the Oxygen A-Band

机译:使用氧气A波段中的卫星测量确定雪上云的光学厚度

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We present our newly developed Cloud optical thickness Retrieval Over Snow (CROS) algorithm, which makes use of the sensitivity of top-of-atmosphere (TOA) reflectance in the oxygen A-band to the cloud optical thickness. The CROS algorithm applies forward simulations for clouds over snow using the radiative transfer model SCIATRAN in order to find the cloud optical thickness (and cloud bottom height and effective underlying surface albedo) representing the measured TOA radiance for a given cloud top height and solar zenith angle. We present results for synthetic retrievals as well as an error analysis with respect to errors in cloud top height. It was demonstrated that the retrievals are most robust for thin high clouds. The retrievals for low-level clouds require an accurate estimation of the cloud altitude ahead of the cloud optical thickness retrieval. Also, it is demonstrated that the retrievals become less accurate for the cases of low Sun.
机译:我们介绍了我们新开发的“雪上云光学厚度反演”(CROS)算法,该算法利用了氧气A波段中的大气顶(TOA)反射率对云光学厚度的敏感性。 CROS算法使用辐射传递模型SCIATRAN对雪上的云进行正演模拟,以便找到代表给定云顶高度和太阳天顶角时测得的TOA辐射的云光学厚度(以及云底高度和有效的下表面反照率)。 。我们提出了综合检索的结果以及关于云顶高度误差的误差分析。事实证明,对于薄薄的高云来说,这种检索是最可靠的。对低层云的检索需要在云光学厚度检索之前准确估算云的高度。此外,事实证明,在太阳较低的情况下,反演变得不那么准确。

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