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

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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