Chapter ? Flashcards
troposphere
the bottommost layer of the atmosphere; it extends to 11km (7 mi) to above sea level
statosphere
the layer of the atmosphere above the troposphere and below the mesosphere; it extends from 11km (7 mi) to 50 km (31 mi) above sea level
ozone layer
a portion of the stratosphere, roughly 17 - 30 km (10 - 19 mi) above sea level, that contains most of the ozone in the atmosphere
atmosphere pressure
the weight per unit area produced by a column of air
relative humidity
the ratio of water vapor given volume of air to the maximum amount the air could contain, for a given temperature.
convective circulation
a circular current (of air, water, magma, ect.) driven by temperature differences in the atmosphere, warm air that rises into the regions of lower atmosphere pressure, where it expands and cools and them descends and becomes denser, replacing warm air that is rising. the air picks up heat and moisture near ground level and prepared to rise again. continuing the process
weather
the local physical properties of the troposphere, such as temperature, pressure, pressure,humidity, cloudiness, and wind, over relatively short time periods
climate
the pattern of atmospheric conditions found across long geographic regions over long periods of time
front
the boundary between air masses that differ in temperature and moisture (and therefore density)
warm front
the boundary where a mass of warm air displaces a mass of colder air
cold front
the boundary where a mass of cold air displaces a mass of warmer air
high pressure system
an air mass with elevated atmospheric pressure, containing air that descends, typically bringing fair weather
low-pressure system
an air mass in which air moves towards the low atmospheric pressure at the center of the system and spirals upward, typically bringing clouds and precipitation
temperature inversion (thermal inversion)
a departure from the normal temperature distribution in the atmosphere, in which a packet of relatively cold air occurs near ground. with warmer air above it. the cold air, denser than the air above, traps pollutants near the ground and can thereby cause a build up of smog
inversion layer
in a temperature inversion, the band of air in which temperature rises with altitude (instead of falling with altitude, as temperature does normally)
Hadley cell
one of a pair of cells of convective circulation between the equator and 30 degrees north and south latitude that influence global climate patterns
polar cell
one of a pair of cells of convective circulation between the poles and 60 degrees north and south latitude that influence global climate patterns
ferrel cell
one of a pair of cells of convective circulation between the 30 degrees and 60 degrees north and south latitude that influence global climate change
Coriolis effect
the apparent deflection of north-south air currents to a partly east-west direction. caused by the faster spin of the regions near the equator than of the regions near the poles as a result of Earth’s rotation
hurricane
a cyclonic storm that forms over the ocean but can do damage upon arriving on land. a type of cyclonic or typhoon that usually forms over the atlantic sea ocean
tornado
a cyclonic storm in which funnel clouds pick up soil and objects, threatening life and causing great damage to property
air pollution
the act of polluting the air, or the condition of being polluted by air pollutants
air pollutants
gases and particulate material added to the atmosphere that can affect climate or harm people or other organisms
outdoor (ambient) air pollution
air pollution that occurs outdoors
aerosals
very fine liquid droplets or solid particles aloft in the atmosphere
primary pollutant
a hazardous substance, such as soot or carbon monoxide, that is emitted into the troposphere in a form that is directly harmful
secondary pollutant
a hazardous substance produced through the reaction of substances added to the atmosphere with chemicals normally found in the atmosphere
residence time
(1) in a biogeochemical cycle, the amount of time a nutrient remains in a given pool or reservoir before moving to another (2) in the atmosphere, the amount of time a gas molecule or pollutant remains aloft
clean air act of 1970
revision of prior US legislation to control air pollution that set stricter standards for air quality, imposed limits for emissions from new stationary and malice sources, provided new funds for pollution control research, and enabled citizens to sue parties violating the standards