Geography Topics

The SALR varies because the amount of latent heat released depends directly on air temperature; warm air contains more water vapor mass and releases more latent heat per unit ascent than cold air.

Geostrophic wind flow occurs when there is an exact equilibrium balance between the horizontal Pressure Gradient Force (PGF) and the Coriolis Force.

Rossby waves are initiated and sustained by the conservation of absolute vorticity ($(\zeta + f)$) as air masses are displaced latitudinally over topographic or thermal barriers.

Conditional instability occurs when the ELR lies between the SALR (~5°C/km) and the DALR (9.8°C/km). The air is stable for dry parcels but unstable for saturated parcels.

During El Niño, the Walker circulation weakens or reverses, causing low-pressure convective anomalies to migrate from the western Pacific eastward toward the central and eastern Pacific.

Mie scattering occurs when particles are roughly equal to or larger than the wavelengths of light, scattering all visible wavelengths equally to produce a white or grayish appearance.

Relative humidity expresses the actual vapor pressure as a percentage of the saturation vapor pressure at a specific temperature.

The Ferrel cell is an indirect, mechanically driven circulation loop. It operates like a gear between the strongly thermally driven Hadley and Polar cells.

An occluded front occurs during mid-latitude cyclone development when a cold front catches up to a warm front, trapping and lifting the warm air mass aloft.

Group B climates are dry climates where potential evapotranspiration exceeds annual precipitation, categorized based on moisture deficits rather than temperature thresholds.