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Retrieval of total precipitable water from thermal infrared observations of INSAT-3D imager over the ocean

机译:从海洋中的Insat-3D成像仪热红外观测中可降水的总可降水

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The present study aims to develop a retrieval algorithm for total precipitable water (TPW) over the ocean using Indian geostationary satellite INSAT-3D observations. The algorithm computes TPW as the sum of two broad layers using thermal infrared observations of the Imager for clear sky and upper tropospheric humidity (UTH) products. First, the differential absorption of the atmospheric water vapour in split-window channels is exploited to estimate atmospheric water vapour concentration from surface to mid-troposphere. Secondly, the contribution from UTH products available from the INSAT-3D Imager is added to estimate TPW. The algorithm performance has been assessed by comparing the INSAT-3Dretrieved TPW with collocated TPW products from radiosonde, INSAT-3D Sounder and Moderate Resolution Imaging Spectroradiometer (MODIS) onboard Aqua satellite for the year 2018. The standard deviation of the error was found to be around 0.5 cm for each of the months.
机译:本研究旨在使用印度地球静止卫星INSAT-3D观测在海洋上出现可降低水(TPW)的检索算法。 该算法使用成像器的热红外观察为清晰的天空和上部对流层湿度(UTH)产品来计算TPW作为两个宽层的总和。 首先,利用分裂窗口通道中的大气水蒸气的微分吸收,以估计从表面到中层的大气水蒸气浓度。 其次,添加了从Insat-3D成像仪获得的UTH产品的贡献来估算TPW。 通过将Insat-3多段产品与来自无线电探测器,INSAT-3D发声器和适度分辨率成像分光仪(MODIS)的搭配TPW产品进行比较,通过从2018年开始评估算法的性能。发现错误的标准偏差是 每个月份约为0.5厘米。

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