Split Window Difference (10.3mm – 12.3mm): Quick Guide

The Split Window Difference (SWD) is a Brightness Temperature Difference (BTD) field that highlights low-level moisture and dust. Moisture can be detected because there is more absorption by water vapor of energy at wavelengths in the ‘Dirty Window’ Channel (12.3 µm) than in the ‘Clean Window’ (10.3...

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Bibliographic Details
Corporate Authors: USA National Oceanic and Atmospheric Administration (Author), USA National Aeronautics and Space Administration (Author)
Format: Electronic eBook
Language:English
Published: [Washington, D.C.,] NASA 2017
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Online Access:Volltext
Summary:The Split Window Difference (SWD) is a Brightness Temperature Difference (BTD) field that highlights low-level moisture and dust. Moisture can be detected because there is more absorption by water vapor of energy at wavelengths in the ‘Dirty Window’ Channel (12.3 µm) than in the ‘Clean Window’ (10.3 µm). Dust can be detected because airborne silicates absorb more 10.3 µm energy than 12.3 µm energy. More absorption of energy leads to colder brightness temperatures. In the image at right, lighter grays highlight a greater SWD, i.e., more moisture in the atmosphere. Convection later forms on the moist axis
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