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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Bibliographische Detailangaben
Körperschaften: USA National Oceanic and Atmospheric Administration (VerfasserIn), USA National Aeronautics and Space Administration (VerfasserIn)
Format: Elektronisch E-Book
Sprache:English
Veröffentlicht: [Washington, D.C.,] NASA 2017
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Zusammenfassung: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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