AntiCyclones YouTube Lecture Handouts
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AntiCyclones YouTube - Lecture - Handouts
Features | Cold Anticyclone | Warm Anticyclone |
---|---|---|
Characteristics | Shallow & extends upto 23 km | Deep, slow moving & associated with blocking in higher latitudes |
Origin | Persistent radiational cooling of land surface & cold overlying atmosphere | Convergence in upper troposphere with subsidence beneath |
Intensity | Decreases with height | Increases with height |
Regions of Formation | High latitude continental interiors e. g. Siberia | Subtropical belt latitude e. g. Bermuda, Greenland, North Canada etc. |
Troposphere Temperature | Colder | Warmer |
Tropopause Pressure | Lower | Higher |
Stratosphere Temperature | Warmer | Colder |
Persistence | More immobile & less persistence | Persist for days, weeks, & even months |
Anticyclone to Cyclone
Features | Anticyclone | Cyclone |
---|---|---|
Surface pressure | High | Low |
Air flow | Diverges at surface | Converges at surface |
Vertical air motion | Subsides | Rises |
Wind speed | Weak | Moderate to strong |
Precipitation | Generally dry | Wet |
Cloudiness | No clouds or stratus clouds | Nimbostratus or cumulonimbus clouds |
Stability | Stable air with no subsidence | May be unstable |
Temperature gradient | Little temperature contrast across high | Strong temperature contrasts at fronts |
Speed of movement | Slow moving or stagnant | Generally mobile, moves west-east |
✍ Manishika