Using the GOES-16 Split Window Difference to Detect a Boundary prior to Cloud Formation
Using the GOES-16 Split Window Difference to Detect a Boundary prior to Cloud Formation
复制标题
使用 GOES-16 分割窗口差异在云形成之前检测边界
DOI：
10.1175/bams-d-17-0141.1
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发表时间：
2018
影响因子：
8
通讯作者：
L. Grasso
中科院分区：
文献类型：
--
作者：
D. Lindsey;D. Bikos;L. Grasso
对地静止环境卫星 16 (GOES-16) 于 2016 年底发射进入地球静止轨道，并于 2017 年初开始提供前所未有的空间和时间分辨率图像。其先进基线成像仪具有额外的光谱带，包括红外光谱的“透明”窗口和“脏窗口”部分中的两个波段，这两个波段的差异（有时称为分割窗口差异）提供了有关低层水蒸气的独特信息。在某些条件下，沿边界的低层汇聚可能会导致局部水蒸气汇集，并且这种汇集的信号有时可以在任何云形成之前被 GOES-16 检测到。这个 2017 年 6 月 15 日的案例研究说明了如何在业务预测设置中使用该技术。在第一片云形成前 2 个多小时，利用分割窗口差异检测到了堪萨斯州西部的边界。
Geostationary Operational Environmental Satellite-16 (GOES-16) was launched into geostationary orbit in late 2016 and began providing unprecedented spatial and temporal resolution imagery early in 2017. Its Advanced Baseline Imager has additional spectral bands including two in the “clear” window and “dirty window” portion of the infrared spectrum, and the difference of these two bands, sometimes called the split window difference, provides unique information about low-level water vapor. Under certain conditions, low-level convergence along a boundary can cause local water vapor pooling, and the signal of this pooling can sometimes be detected by GOES-16 prior to any cloud formation. This case study from 15 June 2017 illustrates how the technique might be used in an operational forecast setting. A boundary in western Kansas was detected using the split window difference more than 2 h before the first cloud formed.