Using Sounder Data to Improve Cirrus Cloud Height Estimation from Satellite Imagers
Using Sounder Data to Improve Cirrus Cloud Height Estimation from Satellite Imagers
复制标题
使用测深仪数据改进卫星成像仪的卷云高度估计
DOI：
10.1175/jtech-d-18-0079.1
复制
发表时间：
2019
影响因子：
2.2
通讯作者：
K. Meyer
中科院分区：
文献类型：
--
作者：
A. Heidinger;N. Bearson;M. Foster;Yue Li;S. Wanzong;S. Ackerman;R. Holz;S. Platnick;K. Meyer
现代极地轨道气象卫星同时提供成像和探测观测。然而，大多数成像仪没有H2O和CO2的吸收带，因此很难准确估计光学薄卷云的高度。探空仪提供了这些所需的观测，但空间分辨率太粗糙，无法分辨许多重要的云结构。本文提出了一种技术，合并探测器和成像仪观测的目标是保持成像仪的高空间分辨率和探测器的光谱信息提供的精度提供的细节。该技术涉及从探测器观测中获得云温度，将探测器温度插值到成像仪像素，并使用探测器温度作为成像仪云高最佳估计方法中的附加约束。这种技术证明了使用同位VIIRS和跨跟踪红外探测器（CrIS）观测的影响，使用一致的CALIPSO/CALIOP云高验证的探测器观测这些比较表明显着改善光学薄卷云的云高。该技术应普遍适用于其他成像仪/测深仪组合。
Modern polar-orbiting meteorological satellites provide both imaging and sounding observations simultaneously. Most imagers, however, do not have H2O and CO2 absorption bands and therefore struggle to accurately estimate the height of optically thin cirrus clouds. Sounders provide these needed observations, but at a spatial resolution that is too coarse to resolve many important cloud structures. This paper presents a technique to merge sounder and imager observations with the goal of maintaining the details offered by the imager’s high spatial resolution and the accuracy offered by the sounder’s spectral information. The technique involves deriving cloud temperatures from the sounder observations, interpolating the sounder temperatures to the imager pixels, and using the sounder temperatures as an additional constraint in the imager cloud height optimal estimation approach. This technique is demonstrated using collocated VIIRS and Cross-track Infrared Sounder (CrIS) observations with the impact of the sounder observations validated using coincident CALIPSO/CALIOP cloud heights These comparisons show significant improvement in the cloud heights for optically thin cirrus. The technique should be generally applicable to other imager/sounder pairs.