Climatology

Concept: Thermodynamic processes are classified based on how heat, pressure, volume, and temperature behave.
Step 1: Understanding the definition.
A process in which no heat is exchanged between the system and surroundings is called an adiabatic process.
Step 2: Key characteristic.
where is heat transfer.
Step 3: Eliminating incorrect options.

• Isothermal: temperature constant.
• Isobaric: pressure constant.
• Isochoric: volume constant.

Conclusion:
Thus, the correct answer is Adiabatic process.

Concept: Albedo is the fraction of incoming solar radiation that is reflected back into space by the Earth's surface and atmosphere.
Step 1: Understanding albedo.
It ranges from 0 (no reflection) to 1 (total reflection).
Step 2: Average value of Earth's albedo.
The Earth reflects about 30% of incoming solar radiation.
Step 3: Eliminating incorrect options.

• 0.1 is too low.
• 0.5 and 0.7 are unrealistically high for Earth.

Conclusion:
Thus, the correct answer is .

Concept: The ITCZ is a region near the Equator where atmospheric circulation plays a key role in global weather patterns.
Step 1: Understanding ITCZ.
The Inter-Tropical Convergence Zone is a low-pressure belt where air rises due to intense heating.
Step 2: Wind behavior at ITCZ.
It is characterized by the convergence of trade winds from the Northern and Southern Hemispheres.
Step 3: Eliminating incorrect options.

• Westerlies occur in mid-latitudes.
• Polar easterlies occur near the poles.
• Jet streams are upper-atmospheric winds.

Conclusion:
Thus, the correct answer is Trade winds convergence.

Concept: The Earth absorbs incoming solar radiation and re-emits energy back into the atmosphere based on its temperature.
Step 1: Understanding radiation types.
The Sun emits shortwave radiation, while the Earth, being cooler, emits longwave radiation.
Step 2: Identifying Earth's emission.
The Earth's surface primarily emits infrared (longwave) radiation.
Step 3: Eliminating incorrect options.

• Ultraviolet and shortwave radiation are mainly solar.
• Gamma radiation is not relevant in this context.

Conclusion:
Thus, the correct answer is Longwave (infrared) radiation.

Concept: Greenhouse gases trap heat in the Earth's atmosphere and maintain the planet's temperature. Different gases contribute differently to the natural greenhouse effect.
Step 1: Understanding greenhouse gases.
Major greenhouse gases include water vapour, carbon dioxide, methane, and nitrous oxide.
Step 2: Identifying the primary contributor.
Water vapour is the most abundant greenhouse gas and contributes the largest share to the natural greenhouse effect.
Step 3: Eliminating incorrect options.

• Carbon dioxide is important but not the largest contributor.
• Methane and nitrous oxide are present in smaller amounts.

Conclusion:
Thus, the correct answer is Water vapour.