Urban Climate
Urban climate is the climate of a city as modified by buildings, streets, materials, vegetation, traffic, energy use, and the geometry of the built environment. It describes the recurring atmospheric conditions that emerge when the regional climate interacts with the urban surface and the urban atmosphere.
Why it matters
Cities alter radiation budgets, heat storage, roughness, moisture availability, and pollutant dispersion. These modifications affect thermal comfort, air quality, energy demand, and heat risk, making urban climate an applied as well as scientific field.
Main controls
- Surface materials with high heat storage and low evaporative capacity
- Street canyons and building geometry that modify wind and radiation
- Reduced vegetation and soil moisture availability
- Anthropogenic heat from transport, buildings, and infrastructure
- Regional weather conditions that determine how strongly urban effects are expressed
Urban climate vs urban meteorology
Urban meteorology focuses on the atmospheric processes that generate urban weather conditions, such as turbulence, heat exchange, and flow distortion. Urban climatology focuses more on recurring patterns, long-term distributions, and spatial contrasts within and around cities.
Urban climate is the umbrella concept linking those process and pattern perspectives.
Typical manifestations
- Urban heat island effects
- Modified wind and turbulence fields
- Changes in humidity and surface energy partitioning
- Altered precipitation and storm behavior in some metropolitan regions
See also: urban meteorology, urban climatology, Urban heat island, Anthropogenic heat, MOC Regional and Urban Climate Modeling