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Principles of Environmental Science Inquiry and Appications9
Chapter 9: Air: Climate and Pollution
40
Environmental Studies
Undergraduate 1
11/08/2012

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Cards

Term
Weather   
Definition

The physical conditions of the atmosphere

(moisture, temperature, pressure, and wind)

Term
Climate
Definition
A description of the long-term pattern of weather in a particular area. 
Term
Aerosols
Definition
Minute particles or liquid droplets suspended in the air. 
Term
Troposphere
Definition
The layer of air nearest to the earth’s surface; both temperature and pressure usually decrease with increasing altitude. 
Term
Convection Currents
Definition
Rising or sinking air currents that stir the atmosphere and transport heat from one area to another. Convection currents also occur in water. 
Term

Ozone

 

Definition

A highly reactive molecule containing three oxygen atoms; a dangerous pollutant in ambient

air. In the stratosphere, however, ozone forms an ultraviolet absorbing shield that protects us from mutagenic radiation. 

Term
Stratosphere
Definition
The zone in the atmosphere extending from the tropopause to about 50 km (30 mi) above the earth’s surface; temperatures are stable or rise slightly with altitude; has very little water vapor but is rich in ozone. 
Term
Albedo
Definition
A description of a surface’s reflective properties. 
Term

 

Greenhouse Effect 

 

Definition
Trapping of heat by the earth’s atmosphere, which is transparent to incoming visible light waves but absorbs outgoing longwave infrared radiation. 
Term

Latent Heat

Definition

Stored energy in a form that is not

sensible (detectable by ordinary senses).

Term
Thermohaline Circulation 
Definition
A large-scale oceanic circulation system in which warm water flows from equatorial zones to higher latitudes where it cools, evaporates, and becomes saltier and more dense, which causes it to sink and flow back toward the equator in deep ocean currents. 
Term

Milankovitch Cycles

 

Definition

Periodic variations in tilt,

eccentricity, and wobble in the earth’s orbit; Milutin Milankovitch suggested these are responsible for cyclic weather changes. 

Term

El Niño

Definition

A climatic change marked by shifting of a large warm water pool from the western Pacific Ocean toward the east. Wind direction and precipitation patterns are changed over much of the Pacific and perhaps around

the world.

Term
Southern Oscillation 
Definition
The combination of El Niño and La Niña cycles. 
Term
La Niña
Definition
The opposite of El Niño.
Term
Intergovernmental Panel on Climate Change (IPCC) 
Definition
A large group of scientists from many nations and a wide variety of fields assembled by the United Nations Environment Program and World Meteorological Organization to assess the current state of knowledge about climate change. 
Term
Kyoto Protocol
Definition
An international treaty adopted in Kyoto, Japan, in 1997, in which 160 nations agreed to roll back CO2, methane, and nitrous oxide emissions to reduce the threat of global climate change. 
Term
Carbon Neutral 
Definition
Producing no net carbon dioxide emissions. 
Term

Carbon Management

Definition

Projects to reduce carbon

dioxide emissions from fossil fuel or to

ameliorate their effects.

Term
Point Sources
Definition
Specific locations of highly concentrated pollution discharge, such as factories, power plants, sewage treatment plants, underground coal mines, and oil wells. 
Term
Primary Pollutants
Definition
Chemicals released directly into the air in a harmful form. 
Term
Photochemical Oxidants
Definition
Products of secondary atmospheric reactions. See also smog. 
Term
Smog
Definition
The combination of smoke and fog in the stagnant air of London; now often applied
to photochemical pollution. 
Term

 

Fugitive Emissions

 

Definition
Substances that enter the air without going through a smokestack, such as dust from soil erosion, strip mining, rock crushing, construction, and building demolition. 
Term

Nonpoint Sources 

 

Definition

Scattered, diffuse sources of

pollutants, such as runoff from farm fields, golf

courses, and construction sites. 

Term

Conventional (Criteria) Pollutants

Definition

The seven substances (sulfur dioxide, carbon monoxide, particulates, hydrocarbons, nitrogen oxides, photochemical oxidants, and lead) identified by the Clean Air Act as the most serious threat of all pollutants to human health

and welfare.

Term
Ambient Air 
Definition
The air immediately around us.    
Term

Unconventional Pollutants

 
Definition

Toxic or hazardous substances, such as asbestos, benzene, beryllium, mercury, polychlorinated biphenyls, and vinyl chloride, not listed in the original Clean Air Act because they were not released in large quantities; also called noncriteria pollutants. 

Term
Sulfur Dioxide 
Definition
A colorless, corrosive gas directly damaging to both plants and animals. 
Term
Nitrogen Oxides
Definition
Highly reactive gases formed when nitrogen in fuel or combustion air is heated to over 650°C (1,200°F) in the presence of oxygen or when bacteria in soil or water oxidize nitrogen-containing compounds. 
Term

Carbon Monoxide

 

Definition

Colorless, odorless, nonirritating

but highly toxic gas produced by incomplete combustion of fuel, incineration of biomass or solid waste, or partially anaerobic decomposition of organic material. 

Term

Particulate Material 

 

Definition

Atmospheric aerosols, such

as dust, ash, soot, lint, smoke, pollen, spores, algal cells, and other suspended materials; originally applied only to solid particles but now extended to droplets of liquid. 

Term
Volatile Organic Compounds
Definition
Organic chemicals that evaporate readily and exist as gases in the air. 
Term
Chlorofluorocarbons
Definition
Chemical compounds with a carbon skeleton and one or more attached chlorine and fluorine atoms. Commonly used as refrigerants, solvents, fire retardants, and blowing agents. 
Term
Temperature Inversions
Definition
Atmospheric conditions in which a layer of warm air lies on top of cooler air and blocks normal convection currents. This can trap pollutants and degrade air quality. 
Term
Heat Islands
Definition
Areas of higher temperatures around cities. 
Term
Dust Domes
Definition
High concentrations of dust and aerosols in the air over cities. 
Term
Synergistic Effects 
Definition
The combination of several processes or factors is greater than the sum of their individual effects. 
Term
Acid Precipitation 
Definition
Acidic rain, snow, or dry particles deposited from the air due to increased acids released by anthropogenic or natural resources. 
Term

New Source Review 

 

Definition

A permitting process required

by 1977 amendments to the Clean Air Act, required when industries expand or modify facilities. The rule is contentious because vague language in the law allows industries to avoid oversight. 

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