Exercise1
You will find;1. Fog / Stratiform Cloud2. Cb / Cg3. Transverse Line4. Upper level flow5. Jet stream, upper level vortex…6. Lower level flow7. Tropical Cyclone
Answer the questionsChec
k‘Text
’
7 questions
Fog / Stratiform Cloud
Visible and Infrared ImageryVisible Image• Detect intensity of reflected solar radiation• Measure the optical thickness of cloud
Infrared Image• Detect brightness temperature emitted from target object• Measure the height of cloud
ThinDarker
Thick ( or dense)Brighter
Low LevelDarker
High LevelBrighter
Detect Fog/Stratiform cloud• Fog / Stratiform cloud is dense cloud in very low level.• This means that it looks darker in Infrared image and
brighter in Visible image.• Also, the surface of the fog area is smooth in Visible
image because it’s just under stable layerInfrare
d Visible
Cb / Cg
How to differentiate Cb and Cg
Cb• Looks whiter than Cg in
Infrared image• Accompanied with anvil
Ci
Cg• Looks like dots
Anvil Ci• Use animation to see
the movement
Upper level phenomenon
Use Water Vapor Imagery
Mixing Ratio
Hei
ght
[km
]
H2O
Tropopause
WV
Low level flow
Compare Visible with Infrared
Low level = Darker in Infrared imageMiddle density = Relatively bright in Visible image