Heating and cooling of the atmosphere

After noon incoming energy can remain greater than outgoing energy for some time. In exams link maximum temperature with energy balance lag.

Longwave energy escapes through the night and heat loss continues until before sunrise. In exams remember it through nocturnal radiational loss.

Arrival of a cold air mass can rapidly lower temperature. In exams understand advection as horizontal temperature change.

Advection of warm dry air can raise temperature and reduce relative humidity. In exams focus on the source region of wind.

Trees reduce sunlight and transpiration converts energy into latent heat. In exams treat vegetation as a microclimate regulator.

A hot surface warms nearby air making it lighter and able to rise. In exams link surface-air temperature difference with convection.

Aerosols scatter and reflect incoming energy. In exams treat them as modifiers of solar radiation.

Snow has a high albedo, which means it reflects a large fraction of incoming sunlight. Because much of the solar energy is reflected, only a smaller part is absorbed by the snow surface and converted into heat. Consequently, the surface receives less daytime heating and its temperature tends to remain low. Therefore, option B is correct. Low albedo would mean strong absorption and greater warming, while more sensible heat and low reflection contradict what happens on a bright snow surface.

The answer follows from the meaning of albedo: it is the proportion of radiation reflected by a surface. Fresh, clean snow is among the most reflective natural surfaces, so its high albedo reduces the net solar energy available for heating. Some energy can still be absorbed, and air temperature also matters, but the principal radiational explanation in the choices is high albedo. Thus, option B gives the correct reason for the relatively low daytime temperature over snow.

Black asphalt absorbs more energy and heats nearby air upward. In exams link low albedo with stronger convection.

Air is a poor conductor so conduction is most effective in the contact layer. In exams treat it as an initial contact process.

Convection changes heat through vertical motion and advection through horizontal air motion. In exams identify them by direction.

In stability an air parcel tends to return downward after lifting. In exams link stable layers with poor dispersion.

Warm air expands becomes lighter and tends to rise. In exams treat buoyancy as the basis of convection.

Moisture and clouds divide energy into latent heat and reflection instead of only heating. In exams treat humidity as reducing temperature range.

Strong daytime heating and strong night radiational cooling occur. In exams link deserts with high diurnal range.

By day clouds reduce shortwave solar energy and by night they trap longwave energy. In exams remember day-night cloud effect separately.

Water takes latent heat to become vapour so the surface remains cooler. In exams treat evaporation as a cooling process.

Long term balance of energy input and output prevents runaway warming or cooling. In exams understand heat balance as energy budget.

Greenhouse gases absorb and re radiate longwave energy emitted by the surface. In exams remember longwave energy.

Water vapour traps longwave energy and releases latent heat during condensation. In exams treat it as a multi effect component.

On a clear calm night the surface cools by radiation and frost can form near freezing. In exams link frost with radiational cooling.

Water releases daytime heat slowly keeping nearby air relatively warmer. In exams treat water bodies as temperature moderators.

Dark and rough materials can absorb and store more energy. In exams treat surface properties as temperature factors.

Trees and water shift energy into latent heat and shade reducing surface heat. In exams link green and water areas with urban cooling.

A warm moist surface provides vapour and rising air which can condense. In exams remember the sequence from energy to cloud.