BIOL 1442 Ch 44 Climate and Effects of Climate Change
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28 Terms
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Global Climate Change
term used to describe altered global weather patterns, especially a worldwide increase in temperature and resulting changes in the climate, due largely to rising levels of atmospheric carbon dioxide
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Climate
long-term, predictable atmospheric conditions of a specific area
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Weather
conditions of the atmosphere during a short period of time
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Climate change can by understood by approaching three areas of study:
evidence of current and past global climate change; drivers of global climate change; documented results of climate change
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Antarctic ice cores show
that there have been periodic cycles of increasing and decreasing temperature
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Before the late 1800s, the Earth has been as much as ( ) degrees cooler and ( ) degrees warmer
9, 3
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The Medieval Climate Anomaly occurred between 900 and 1300 AD, which included
slightly warmer weather; allowed the Vikings to colonize Greenland
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The Little Ice Age occurred
between 1550 AD and 1850 AD, which included a slight cooling of less than 1 degree Celsius, observable in North America and Europe
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The Industrial Revolution led to advances in
agriculture, food supply, and improved standard of living
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With the beginning of the Industrial Era, atmospheric carbon levels began to
rise
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Milankovitch cycles
describe the effects of slight changes in the Earthās orbit on climate, the length of each lasting from 19,000 to 100,000 years
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The variation in the sunās intensity is a ( ) responsible for climate change
natural factor
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Solar intensity
amount of solar power or energy the sun emits in a given amount of time
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As solar intensity increases (or decreases) the Earthās temperature correspondingly
increases (or decreases)
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Volcanic eruptions are a natural driver of climate change by
releasing solids and gases that influence the climate over a period of years
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haze-effect cooling
global phenomenon that occurs when dust, ash, or other suspended particles block sunlight and trigger lower global temperatures as a result
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Greenhouses gases are the
most significant drivers of the climate
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Greenhouse gases trap
heat in the atmosphere
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The greenhouse gases that effect Earth are
carbon dioxide, methane, water vapor, nitrous oxide, and ozone
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Greenhouse effect
the warming of Earth due to carbon dioxide and other greenhouse gases in the atmosphere
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Beginning only a few centuries ago, atmospheric carbon dioxide concentrations have
increased beyond the historical maximum of 300 ppm
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Human activity releases CO2 into the atmosphere in several ways:
burning of fossil fuels, deforestation, cement manufacture, animal agriculture, clearing of land, and burning of forests
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Methane is produced when
bacteria break down organic matter under anaerobic conditions
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Methane can be released from
natural gas fields, decomposition of plant and animal material, and melting of clathrates
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Permian extinction
event that occurred 251 million years ago towards the end of the Permian period, which was one of the three warmest periods
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The loss of ice leads to an increasing
global sea level, on average 1.8 mm per year
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Temperature and precipitation play key roles in determining
geographic distribution and phenology of plants and animalsp
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phenology
study of climatic conditions on the timing of periodic life cycle events