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Exam 4
climate change
38
Environmental Studies
Undergraduate 3
12/12/2011

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Term
9000 records were broken or tied in this month
Definition
July 2011
Term
Climate
Definition
the prevailing atmospheric conditions at a particular place or region over a given time period
Term
Paleoclimate
Definition
earths climates over the past 4.5 billion years
Term
Proxy
Definition
a substitute
Term
Paleoclimate proxy
Definition
the study of natural phenomena (animal, vegtable or mineral) which are climate dependent and which incorporate into their structure a measure of this dependency
Term
Proxy Climate Data
Definition
observational data used as surrogates for conditions not directly observable- tree rings, ice cores, fossil pollen, ocean sediments, corals, vertebrate remains
Term
Palynology
Definition
microscopic study of pollen remains, most widely used technique for paleoenvironmental analysis
Term
Isotopes
Definition
elements having differing numbers of neutrons, these variations of the same element are called isotopes
Term
18,O
Definition
Heavier than 16,O
during glacial periods, seawater is enriched in 18,O
Term
16, O
Definition
Lighter than 18,O
usually evaporated
during glacial periods, large amounts of precipitated water is held in glaciers
Term
Pleistocene Glaciations
Definition
by 2.4 mya, substantial ice sheets had developed across the northern hemisphere
at their maximum extent, 30% of Earths surface was covered by ice
Term
Laurentide Ice Sheet
Definition
Over Canada
Term
Cordilleran Ice Sheet
Definition
Below Alaska
Term
Late Pleistocene (130-10 ka)
Definition
Earliest part is Sangaman Interglacial, the warmest period of the Quaternary, numerous paleosols developed, corresponds to oxygen isotope substage
numerous glacial advances and retreats
Term
The Younger Dryas
Definition
Brief cold period 13-11 BP
Rapid cooling (1000years) followed by rapid warming (100years)
possibly caused by disruption of NADW ocean circulation pattern
Term
Holocene Climate Change
Definition
Holocene begins 10,000 years ago
Considered an interglacial
Documented climatic oscillations
Term
The Hypsithermal
Definition
Mid Holocene period of maximal warmth and dryness
ca 8000 to 4000 yr BP
warmest period of the Holocene, 2-4c warmer than at present
Pollen records provide best evidence
Term
Medieval Warm Period
Definition
Roughly 700AD to 1300AD
during this time wine grapes were grown in Europe up to 300 miles north of their present northerly growing limit.
Term
The Little Ice Age
Definition
A period of unusual cooling which began immediately following the Medievel Warm Period and lasted nearly until the present time (1300AD to 1900AD)
Reached its peak between 1550 and 1700AD
the average global temperature dropped between 1 and 2 degrees Celsius
Term
Possible Causes for the Little Ice Age
Definition
increased volcanic activity
reduction in solar output:Maunder Minimum period of severely reduced sunspot activity
changes in the course of the Gulf Stream
Increase in the reflectivity of incoming solar radiation
Term
The Anthropocene
Definition
most recent period in the Earth's history during which humans have had a significant global impact, particularly on ecology and climate
James Watt's invention of the steam engine in 1784
Term
Early Anthropocene Hypothesis
Definition
William Ruddiman, greenhouse gas emissions began 8000 years before the industrial era when ancient farmers cleared forests to grow crops
Term
Secundum Ruddiman I
Definition
beginning 8000 years ago humanss reversed an expected decrease in CO2 by clearing forests in Europe, China, and India for croplands and pasture
Term
II
Definition
beginning 5000 years ago humans reversed an expected decrease in methane (CH4) by diverting water to irrigate rice and by tending large herds of livestock
Term
III
Definition
in the last few thousand years the size of the climate warming caused by these early greenhouse emissions may have grown large enough to prevent a glaciation that climate models predict should have begun in the northeast Canada
Term
IV
Definition
Abrupt reversals of the slow CO2 rise caused by deforestation correlate with bubonic plague and other pandemics near AD200-600, 1300-1400 and 1500-1700
Term
V
Definition
high mortality rates caused by the plague led to massive abandonment of farms causing them to regrow lowering CO2 levels
Term
VI
Definition
when the farms were reoccupied the forests were cut returning the CO2 to the atmosphere
Term
Climate Forcing
Definition
an imposed change of earths energy balance( solar forcing, volcanic forcing, anthropogenic forcing
measured in Wattts per square meter (W/m2)
positive values are associated with temp increase and negative values with temp decrease
Term
Climate sensitivity
Definition
a measure of how responsive the temp of the climate system is to a change in the radiative forcing
usually expressed as the temp change associated with a doubling of the concentration of carbon dioxide in earths atmosphere
Term
Climate Response Time
Definition
the amoutn of time that it takes for the climate to respond to a climate forcing event
Term
Solar Forcing
Definition
the change in the amount of radiation emitted by the Sun
variations have periodic components, the main one being the approximately 11 year solar cycle
Term
Volcanic Forcing
Definition
volcanoes can propel enormous amounts of particulate matter high into the atmosphere
these aerosols are transported by strong upper-level, winds around the globe
aerosols reflect a significant amount of the sunlight, which results in a net cooling of earths surface
Term
Mount Pinatubo Eruption, June 1991
Definition
Caused global temps to decrease 2.3C over a year
Term
Anthropogenic Forcing
Definition
Human-induced effects on climate
Greenhouse gases, particularly carbon dioxide emissions, are the major culprit
Term
Global Dimming
Definition
the reduction in incoming solar energy by as much as 10% caused by human induced increases in particulate matter in the atmosphere
Global dimming creates a cooling effect that is offsetting the effect of greenhouse gases on global warming by as much as 50%
Term
Top 5 Greatest Effects of Global Warming
Definition
5. Spread of Disease-vector agent that transmits infections
4. Warmer Ocean Temperatures-stronger hurricanes
3. Economic Consequences- intense storms cause damage
2. Increase in frequency of heat waves and droughts
1.Melting of Polar Ice
Term
Red Queen Hypothesis
Definition
a species must continually adapt to a dynamic environment or risk extinction
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