Climate Dynamics Lecture Flashcards

Vocabulary flashcards testing key concepts, quantitative values, atmospheric layers, radiation balance terms, topographic effects, and climate drivers from the lecture slides.

Global Climate Dynamics

Climate variations occurring at the global spatial scale, driven by atmospheric circulation, oceanic currents, and solar radiation distribution.

Regional Climate Dynamics

Climate variations occurring at a regional scale, driven by atmospheric circulation, oceanic currents, solar radiation distribution, and topography.

Local Climate Dynamics

Climate dynamics operating at a local scale, influenced by topography, vegetation cover, urbanization, and proximity to water bodies.

Microclimate Dynamics

Climate dynamics operating at very fine spatial scales, determined by topography, vegetation cover, soil color, and soil moisture.

Troposphere

The lowest layer of the atmosphere ($0\text{-}15,km$), heated from the bottom, which serves as the zone of weather, land-atmosphere mass-energy exchange, and the greenhouse effect.

Stratosphere

The atmospheric layer located from $15\text{-}47,km$ above Earth, heated from the top through the absorption of ultraviolet (UV) radiation by ozone.

Atmospheric Structure

The vertical layering of Earth's atmosphere characterized by distinct thermal regimes and pressure boundaries.

Ultraviolet (UV) Radiation

High-energy solar radiation with short wavelengths ($< 400,nm$) capable of destroying biological machinery.

Photosynthetically-Active Radiation (PAR)

Visible light radiation with wavelengths between $400,nm$ and $700,nm$ that is visible to the human eye and contributes most to photosynthesis.

Infrared (IR) Radiation

Long-wavelength ($> 700,nm$) low-energy thermal radiation that is absorbed by gases in the troposphere, driving the greenhouse effect.

Shortwave Radiation Budget

The incoming solar flux where $342,W/m^2$ enters the upper atmosphere, $107,W/m^2$ is reflected by clouds/Earth, $67,W/m^2$ is absorbed by the atmosphere, and $168,W/m^2$ reaches the surface.

Earth Radiation Balance Equilibrium

The steady-state condition where net absorbed solar radiation ($342,W/m^2 - 107,W/m^2 = 235,W/m^2$) equals outgoing longwave radiation ($235,W/m^2$).

Surface Energy Dissipation

The release of absorbed surface energy ($492,W/m^2$ total) through convection ($24,W/m^2$), latent heat evapotranspiration ($78,W/m^2$), and direct surface radiation ($390,W/m^2$).

Earth's Axial Tilt

The constant $23^\bullet$ inclination of Earth's rotational axis relative to its orbital plane that produces seasonal variations in solar radiation, particularly at higher latitudes.

Dry Adiabatic Lapse Rate

The rate at which dry, unsaturated air cools as it ascends, equal to $10,^\bullet\text{C} / 1000,\text{meters}$.

Wet Adiabatic Lapse Rate

The reduced rate at which saturated air cools as it ascends above the condensation level, equal to $5,^\bullet\text{C} / 1000,\text{meters}$.

Adiabatic Lapse Rate

The rate at which an air parcel changes temperature as it moves vertically through the atmosphere without exchanging heat with surrounding air.

Slope Aspect

The compass direction that a terrain slope faces, influencing local solar radiation exposure and microclimatic conditions.

Cold-Air Drainage

The downslope flow and pooling of denser, cooler air into low-lying valley bottoms during calm nights.

Orographic Lift

The forced upward movement of air masses over mountain barriers, leading to cooling, condensation, rain cloud formation, and elevated precipitation on the windward slope relative to the leeward slope.

Rain Shadow

A dry area on the leeward side of a mountain range produced because air loses its moisture through precipitation while ascending the windward side.

Natural Climate Oscillations

Cyclical planetary climate variations such as El Niño/Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO).

El Niño/Southern Oscillation (ENSO)

A major Pacific ocean-atmosphere climate cycle involving fluctuations in trade winds, surface water temperatures, and atmospheric precipitation patterns across South America, Australia, and Indonesia.

Human-Enhanced Greenhouse Effect

Atmospheric warming caused by anthropogenic emissions of greenhouse gases ($CO_2$, $CH_4$, $N_2O$) that re-radiate heat back to the surface, reducing heat loss to space.

Climatic Impacts of Deforestation

Environmental altered state where replacing rainforest canopy with pasture increases surface temperature, lowers latent heat loss, reduces evapotranspiration, and dries the local atmosphere.