earth’s climate through timeiceage.umeqs.maine.edu/ers121/slides/dinosaurs2mammoths.pdfearth’s...
TRANSCRIPT
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Earth’s climate through time
"The Blue Marble" is a famous photograph of the Earth taken on December 7, 1972, by the crew of the Apollo 17 spacecraft en route to the Moon at a distance of about 29,000 kilometres (18,000 mi). It shows Africa, Antarctica, and the Arabian Peninsula.
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dinosaurs
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mammoths
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Geologic Time Scale
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Late Precambrian ice ages
Cambrian explosion
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Late Precambrian ice age
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Cambrian explosion
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Cambrian explosion
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Cambrian explosion
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Cambrian explosion
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Cambrian explosion
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Ordovician
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Devonian/Carboniferous
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Phanerozoic CO2
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Permo-Carboniferous ice age
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Permian
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Mesozoic - Age of the Dinosaurs
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Triassic
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Jurassic
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Cretaceous
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Cretaceous
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Cretaceous
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Cenozoic cooling
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Cenozoic cooling
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Eocene
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Miocene
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Key factors
Radiative forcing • solar variability
Greenhouse forcing • carbon dioxide
• water vapor
Tectonic forcing • position & size of continents
• mountain building • ocean circulation
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CO2 - temp
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Plio-Pleistocene
onset of northern hemisphere glaciation
100,000 year world
41,000 year world
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Plio-Pleistocene
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Vostok CO2
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Northern hemisphere ice sheets at the last glacial
maximum (LGM)
global temperature was 6˚C lower
sea level was 120 m lower
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sea level
120 meters lower at the LGM (20,000
year ago)
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mammoths