Climatology of stratocumulus cloud morphologies: Microphysical ...
RGB Applications for Cloud Microphysical Analysis in NinJo
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Transcript of RGB Applications for Cloud Microphysical Analysis in NinJo
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RGB Applications for Cloud Microphysical Analysis in NinJo
Victor Chung
SAAWSO Project Workshop
April 22-24, 2013
National Lab for Nowcasting and Remote Sensing MeteorologyMSC Ontario
Environment Canada
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Objective
To demonstrate how to use RGB imageries in NinJo to perform
daytime cloud microphysical analysis
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Why do we need RGB?
...because you can see more with an RGB.....
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Role of 3.9 µm in RGB
http://www.meted.ucar.edu/satmet/goeschan/print/6_2_4_3.htm
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The microphysics RGB in NinJoMicrophysics (day) [0.67, 3.7-10.7, 10.7i]
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RGB examples to differentiate between water and ice clouds
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Color enhanced imagery at 10.7 µm.
A
B
CD
E
F
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Color enhanced imagery at 3.7 µm
A
B
CE
D
F
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Let us look at cloud masses A, D, E, and B
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Cloud mass AAppearance in channel 10.7 and 3.7 µm
cold at IR but quite warm at NIR super-cooled water droplets
10.7µm
3.7 µm
T_10.7: -23 to -29 C
T_3.9: 12 to 20 C
Cloud mass A
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Cloud mass AAppearance in RGB
Super-cooledwater droplets
RGB
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Cloud mass D & EAppearance in 10.7 and 3.7 µm
E (-20 to -25 C)
D (-20 to -25 C)
E (-13 to -15 C)
D (~15 C)
10.7 µm
3.7 µm
D: cold at IR, warm at NIR Super-cooled droplets
E: cold at IR, cold at NIR Ice particles
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Histogram Plots for 10.7 and 3.7 µm Channels for a Line Across Cloud Masses D and E
10.7 µm (IR) 3.9 µm (NIR)
Small temperatureRange at IR
Two distinct peak atNIR
Ice
Water
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Cloud masses D & EAppearance in RGB
E
D
RGB E: ice
D: super-cooled water
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Let us look at cloud mass B evolution from 19 to 21z
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Cloud mass B evolution from 19 to 21Z(at 19Z)
Ice or water?10.7 µm 3.7 µm
0.65 µm RGB2
It is water!
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Scatter Plots of 3.7 versus 10.7 µm Channels for an Area over Cloud Mass B at 19Z
IR well below freezingNIR warm waterConclusion: super-cooledcloud droplets
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Histogram Plots for 10.7 and 3.7 µm Channels for an Area over Cloud Mass B at 19Z
10.7 µ 3.7 µm
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Cloud mass B at 20ZIce nucleation is
underway!10.7 µm (IR) 3.7 µm (NIR)
RGB0.65 µm
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Scatter Plots of 3.7 vs 10.7 µm Channels for an Area over Cloud Mass B at 20Z
Small IRspread
Large NIRspread
Ice nucleation in process(water drops + ice crystals)
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Histogram Plots for 10.7 and 3.7 µm Channels for an Area over Cloud Mass B at 20Z
10.7 µm 3.7 µm
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Cloud mass B at 21Z
10.7 µm 3.7 µm
0.65 µm RGB
Clouds consists of mainly ice crystals
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Scatter Plots of 3.7 vs 10.7 µm Channels for an Area over Cloud Mass B at 21Z
More pixels with NIRtemperature shift toThe colder side
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Histogram Plots for 10.7 and 3.7 µm Channels for an Area over Cloud Mass B at 21Z
10.7 µm 3.7 µm
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Conclusion• The special characteristics of the 3.7 um allows us to create a useful
RGB for cloud microphysical analysis
• Several examples have been used to demonstrate how to use this RGB operationally to differentiate between water and ice clouds
• This RGB can be applied for summer storm analysis, for example ice nucleation and lightning
• This RGB can be used in conjunction with other icing products for better cloud icing detection
Water Ice
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Thank You!
Questions?
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Outline --- this slide will not be shown
Objective- To demonstrate how to perform cloud
microphysical analysis using RGB imageries in NinJo
IntroductionOpener
- With RGB imagery, you can see things that can not be seen with a single channel imagery
- Characteristics of 3.9 um and its role on RGB imagery
Topic- Use of RGB in NinJo for cloud microphysics analysis
Thesis (idea convey)- RGB imagery helps forecasters to monitoring
cloud microphysical properties- Good microphysical analysis helps detecting
icing, and convective storm analysis
The Body- A list of examples for cloud microphysical analysis
ConclusionRestate the thesis
- RGB should be used more for cloud top microphysical analysis to improve our weather monitoring capabilityAction for future works
- Real-time applications for summer and winter storms
- Use in conjunction with icing product