CLIMATE: L2 - quaternary and cooling.

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  • Created by: Elena
  • Created on: 01-04-14 21:53
What is proxy data?
Shows reqular and frequent climate fluctuations. preserve physical characteristics of the past. eg forams - shell that stores oxygen isotopes.
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How and when did we get into a glacial global climate?
first evidence widespread glaciation (N hem) = deep ocean cores reveal large volume of ice debris at 2.6MA BP. also contain volcanic ash.
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Long timescale climate change: quaternary ice cover due to tectonic uplift eg himalayas?
led to modified circulation patterns, more weathering (removal of c02 from atmosphere)
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Main causes of plio-pleistocene boundary?
disposition of land masses (poleward migration of land masses, separation of ant and aus), tectonic activity, feedback mechanisms (atmos and ocean circulation)
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What is the croll-milankovitch astronomical theory?
change in intensity of seasons in NH control ice inception/decay.
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earths distance from sun varies seasonally: what is diff between perihelion and aphelion?
peri - near in NH winter, aphelion - furthest away in NH summer.
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UNEVEN receipt of insolation complicated by orbital factors. what are the 3 main factors?
Eccentricity, Obliquity, precession.
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What is eccentricity?
change in Earth’s ORBIT from circular to ellipsoidal (100ka & 400ka cycle)
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What is obliquity?
change in tilt of Earth’s AXIS of rotation (21.8o – 24.4o over 41ka)
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What is Precession of the equinoxes?
wobbling of Earth on its axis due to GRAVITATIONAL ATTRACTION of sun & moon (23ka & 19ka cycles)
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Card 2

Front

How and when did we get into a glacial global climate?

Back

first evidence widespread glaciation (N hem) = deep ocean cores reveal large volume of ice debris at 2.6MA BP. also contain volcanic ash.

Card 3

Front

Long timescale climate change: quaternary ice cover due to tectonic uplift eg himalayas?

Back

Preview of the front of card 3

Card 4

Front

Main causes of plio-pleistocene boundary?

Back

Preview of the front of card 4

Card 5

Front

What is the croll-milankovitch astronomical theory?

Back

Preview of the front of card 5
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