MillerIceAge - Glaciers, the Ice Ages, and global climate...

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Wisconsin Illinoian Kansan Nebraskan Youngest Oldest Glaciers, the Ice Ages, and global climate What caused the ice ages? Last glacial maximum 20,000 yrs ago Milankovitch: Minor variations in Earth’s orbit control insolation and ice ages
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Glaciers, the Ice Ages, and global climate At least 4 ice sheets in last 2 Ma Wisconsin Illinoian Kansan Nebraskan ages are uncertain!
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Ice or Glacial Age Long-term reduction in T 0 at Earth’s surface and atmosphere. Last glacial maximum, mean T 10°C vs. 15.8°C today Expansion of ice and presence of extensive ice sheets. Within ice ages, extra cold period termed “glaciation”; warmer periods “interglacials”.
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CO 2 Global Energy Balance Em itte d Te rre s tria l  Ra dia tio n Inc o m ing  S o la r  Ra dia tio n Ea rth’s  te m pe ra ture  is   de te rm ine d b y the  b ala nc e   b e twe e n the s e  two  e ne rg y  fluxe s .
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Clip from Inconvenient Truth : VP Gore Explains GH Warming
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Light come in, heat trapped by CO 2
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The Goldilocks Planet: CO 2 The difference between -18° and 15°C Provided by A. Broccoli
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Higher CO 2 : Anthropogenic Influence What exit? Looking for America on the NJ turnpike The Keeling curve Observatory at top of Mauna Loa, the big Island
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Gore: CO 2 rise
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Coring Continental Ice Ice cores with climate records of the last ~400,000 yrs have been collected in the ice sheets of Greenland and Antarctica.
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Working With Glacial Ice Geologists examine the stable isotope compositions and trapped gas contents (CO 2 and CH 4 ) of ice cores. Layering in the ice provides a time record, just like varved lake sediments.
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Temperature, CH 4 , and CO 2 Variations Vostok ice core, Antarctica
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Inconvenient Truth : Past vs. Future Warming
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40% higher 385
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Observations past 400,000 yrs.
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MillerIceAge - Glaciers, the Ice Ages, and global climate...

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