Question

Distinguish between Tropical cyclone and Temperate cyclone. (Any three)

Hint:

{Three Key Differences:}

• {Location:} Tropical (5-30°) vs Temperate (30-60°)
• {Structure:} Warm-core with eye vs Cold-core with fronts
• {Energy:} Latent heat from ocean vs Temperature contrast

Answer 1

Tropical Cyclone vs Temperate Cyclone

Tropical cyclones and Temperate cyclones (also called Extratropical or Mid-latitude cyclones) are two different types of atmospheric disturbances with distinct characteristics.

1. Based on Location and Formation

Tropical Cyclone:

• Forms between 5° and 30° latitudes in both hemispheres.
• Develops over warm tropical oceans.
• Requires sea surface temperature greater than \( 26.5^\circ C \).
• Does not form near the equator due to weak Coriolis force.

Temperate Cyclone:

• Forms between 30° and 60° latitudes.
• Develops over both land and sea.
• Forms along fronts (boundary between warm and cold air masses).

2. Based on Structure and Temperature

Tropical Cyclone:

• Warm-core system (center warmer than surroundings).
• No fronts associated.
• Has a well-defined eye at the center.
• Symmetrical circular shape.

Temperate Cyclone:

• Cold-core system.
• Associated with warm and cold fronts.
• No eye formation.
• Asymmetrical, wave-like structure.

3. Based on Wind Speed and Energy Source

Tropical Cyclone:

• Wind speed \( > 119 \, km/h \) (can exceed 250 km/h).
• Energy derived from latent heat of condensation.
• Weakens over land or cold water.

Temperate Cyclone:

• Wind speed between \( 30-100 \, km/h \).
• Energy derived from temperature contrast between air masses.
• Can persist over land.

Comparison Table:

Feature	Tropical Cyclone	Temperate Cyclone
Season	Late summer (warm ocean season)	Winter (maximum temperature contrast)
Size	100–500 km diameter	1000–3000 km diameter
Precipitation	Heavy convective rainfall	Widespread moderate rainfall or snowfall
Life Span	Few days to one week	Several days to two weeks

Energy Representation:

For Tropical Cyclone:

\( Energy \propto Latent \, Heat \, Release \)

For Temperate Cyclone:

\( Energy \propto Temperature \, Gradient \)