Deglacial%20Climate%20Change - PowerPoint PPT Presentation

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Deglacial%20Climate%20Change

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Deglacial Climate Change Humans and Paleoclimate Deglacial Climate Change Humans and Paleoclimate Radiocarbon dates showing the retreat of the N. American ice sheet ... – PowerPoint PPT presentation

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Title: Deglacial%20Climate%20Change


1
Deglacial Climate Change
2
Radiocarbon dates showing the retreat of the N.
American ice sheet
3
Coral data provided data on the rate of sea level
change
4
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5
Proxy records provide evidence for a cold episode
(Younger Dryas) that interrupted the deglacial
process.
6
The Greenland ice cores show rapid (lt100 yrs)
changes in ice accumulation and dust.
7
Routes of meltwater flow
8
Deglaciation flooding of coastlines
9
Tropical monsoons were stronger in the northern
hemisphere 9,000 yrs ago
10
Proxy records also show tropical monsoon maximum
9,000 yrs ago.
11
Decreased summer insolation in the northern
tropics has produced weaker tropical monsoons.
12
Decreased summer insolation at high northern
latitudes during the last 6,000 yrs coincides
with cooler temperatures.
13
Humans and Paleoclimate
14
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15
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16
The spread of agriculture
17
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18
Quelccaya ice cap in Peru
19
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20
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21
The Little Ice Age could have resulted from
orbital-scale cooling or from a millennial-scale
oscillation.
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