WEEK 2: Wednesday April 6: Earth’s past climate and what caused those changes

• slides posted 4/7 p.m.:  Belanger OLLI week2 slides pptx; Belanger OLLI week2 slides pdf
• Handout – handouts week 2
• Further explanation of Isotopic fractionation: 2 slides included in slides above: O18 fractionation;
• VERY GOOD supplemental article to explain isotopes: isotopes explained L16-N

LINKS to week 2 CONTENT:

• Earth’s deep past before the Cambrian (600 MaBP): hot and cold – Snowball Earth: video shown in class from U of Exeter password protected – sorry unavailable

Article Link: BBC Nature http://www.bbc.co.uk/nature/ancient_earth/Snowball_Earth

You Tube: https://www.youtube.com/results?search_query=snow+ball+earth

Google Snowball earth for other links; also see links within pptx above

• Earth’s past: Cambrian onward: mostly hot-house Earth;  100s parts per million (ppm) A human induced climate-GSAtoday2012-02

• Climate trend in the Cenozoic – the last 65 million years; proxy data from 3600ppm to <200 ppm.

• More recent past: 180-280 part per million; how do we know – empirical data. Preview of next week’s field trip

• Today: 400 ppm and growing 2-3 ppm/year

• Timing and climatic consequences of the opening of Drake Passage: Science-2006-Scher-428-30

FOR THE AMBITIOUS: go to the “FOR THE AMBITIOUS” PART OF THE WEB PAGE AT https://denverclimatestudygroup.com/?page_id=1219