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28 Cards in this Set
- Front
- Back
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Charles Lyell |
Ice rafted boulders. Erratics carried by icebergs during biblical era. |
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Louis Agassiz |
That a vast sheets of ice covered earth and killed everything. |
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Erratic |
Rock carried by glacial ice to an area where it differs in size and type to its surroundings |
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IRD |
Not sure |
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Snowball Earth |
That between 600-700 million years ago the earth was completely covered in ice |
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THC or MOC |
Thermohaline Circulation. Part of large scale oceanic circulation driven by global density gradients created by surface heat and freshwater fluxes. Lecture 8. |
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Maunder Minimum |
Prolonged sunspot minimum between 1645 until 1715. When sunspots became exceedingly rare. |
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Uniformitarianism |
Charles Lyells idea of it: Uniformity of... law: laws of nature are constant across space and time Methodology: hypotheses for explaining the geological past are those with analogy today Kind: past and present are all the same kind, have the same energy, and produce the same effects Degree: geological circumstances have remained the same over time |
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Sunspots |
Temporary phenomenon on the photosphere of the sun. Dark spots of reduced surface temperature. Correlation between minimal sun spots and lower mean temperatures. |
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Mitigation |
Doing something to stop the increase of greenhouse gases. |
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Foraminifera |
Microscopic marine organisms that incorporate oxygen into their shells. Isotope ratios reveal informative about environment and global ice volume. Act as proxy. |
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Water isotopes |
· There are heavy O-18 and light O-16 isotopes of oxygen. · Light more common · Ratio in proxies reveals past climate changes · Effects evaporation and condensation. · Water made of light evaporates easier · Heavy condenses easier |
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Last glacial maximum |
21ka. Relative to pre industrial era .1750 climate. Last glacial period when ice sheets were at their maximum. |
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Pleistocene |
Geological epoch such which lasted from 2,588,000 to 11700 years ago. Most recent period of glaciation. End of Pleistocene corresponds with end of last glacial period |
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Anthropocene |
Epoch dating the last 50 years when man started effecting climate. |
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Medieval warm period |
800-1400 ad. In areas such as North Atlantic were warmer than normal. The area of warning was limited and probably due to changing wind patterns |
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Milankovitch Cycles |
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Orbital insolation |
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Holocene Stability |
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Holocene temperature variability |
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Reconstructed temperature |
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Global temps |
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Cronin 8.1 |
Cronin 8.1 |
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The walker circulation |
Seen at surface as easterly trade winds which move water and air warmed by the sun towards the West. The western side of the equatorial Pacific is characterized by Warren, wet low pressure weather. |
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ENSO, effects of el Nino, nina |
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How did Milanvkovitch Assist? |
Postulated that consolation in the summer characterizes the ice and warm periods at sixty five degrees north. |
