Chapter 17 - Atmospheric Science, Air Quaility, and Pollution Control 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
clean air act of 1990
US legislation that strengthened regulations pertaining to air quality standards, auto emissions, toxic air pollution, acid deposition, and depletion of the ozone layer, while also introducing market based incentives to reduce pollution
carbon monoxide (CO)
a colorless, odorless gas produced primarily by the incomplete combustion of fuel
sulfur dioxide (SO2)
a colorless gas that can result from the combustion of fuel. in the atmosphere, it may rect to form sulfur trioxide (SO3) and sulfuric acid, which may return to the earth in acid deposition
lead
a heavy metal that may be ingested through water or paint, or that may enter the atmosphere as a particulate pollutant through combustion of leaded gasoline or other processes. atmospheric lead deposited on land and water can enter the food chain, accumulate within body tissues, and cause lead poisoning in animals and in humans. an EPA criteria pollutant
volatile organic compound (VOC)
one of a large group of potentially harmful organic chemicals used in industrial processes. one of the six major pollutants whose emissions are monitored by the EPA and state agencies
particulate matter
solid or liquid particles small enough to be suspended in the atmosphere and able to damage respiratory tissues when inhaled. includes primary pollutants such a dust or soot as well as secondary pollutants such as sulfates and nitrates. an EPA criteria pollutant
nitrogen oxide (NOx)
one of a family of compounds that includes nitric oxide (NO) and nitrogen oxide (NO2)
scrubber
technology to chemically treat gases produced in combustion in order to reduce smoke stack emissions. these devices typically remove hazardous components and neutralize acidic gases, such as sulfur dioxide and hydrochloric acid, turning them into water and salt
industrial smog
“gray-air” smog caused by the incomplete combustion of coal or oil when burned
ozone-depleting substances
airborne chemicals, such as halocarbons, that destroy the ozone layer in the stratosphere
acid deposition
the settling of acidic or acid forming pollutants from the atmosphere onto Earth’s surface, this may take place by precipitation, fog, gases, or deposition of dry particles
acid rain
acid deposition that takes place through rain
atmospheric deposition
the wet or dry deposition on land of a wide variety of pollutants, including mercury, nitrates, organochlorines, and others. acid deposition is one type of atmospheric deposition
indoor air pollution
air pollution that occurs indoors
nitrogen dioxide (NO2)
a foul smelling reddish brown gas that contributes to smog and acid deposition. it results when atmospheric nitrogen and oxygen react at high temperatures created by combustion engines. an EPA criteria pollutant
tropospheric ozone
ozone that occurs in the troposphere, where it is a secondary pollutant created by the interaction of sunlight, heat, nitrogen oxides, and volatile carbon-containing chemicals. a major component of smog, it can injure living tissues and cause respiratory problems. an EPA criteria pollutant
toxic air pollutant
air pollutant that is known to cause cancer, reproductive defects, or neurological development, immune system, or respiratory problems in humans, and or cause substantial ecological harm by affecting the health of nonhuman animals and plants. the clean air act of 1990 identifies 188 toxic air pollutants, ranging from the heavy metal mercury to VOCs such as benzene and methylene chloride
halocarbon
a class of human-made chemical compounds derived from simple hydro-carbons in which hydrogen atoms are replaced by halogen atoms such as bromine, fluorine, and chlorine. many halocarbons are ozone depleting substances and or greenhouse gases
chlorofluorocarbons (CFC)
a type of halocarbon consisting of only of carbon, hydrogen, fluorine, and chlorine. CFCs were used as refrigerants, fire extinguishers, propellants for aerosals spray cans, cleaners for electronics, and for making polystyrene foam. they were phased out under the Montreal protocol because they are ozone depleting substances that destroy stratospheric ozone
ozone hole
term popularly used to describe the thinning of the stratospheric ozone layer that occurs over Antartica each year, as a result of CFCs and other 03 depleting substances
Montreal protocol
international treaty ratified in 1987 in which 180 (now 196) signatory nations agreed to restrict production of CFCs in order to halt stratospheric 03 depletion. this was a protocol of the Vienna convention for the protection of the ozone layer. the Montreal protocol is widely considered the most successful effort to date in addressing a global environmental problem
