CU-Boulder ATOC 1060 - ATOC CH 12-14 (8 pages)

Previewing pages 1, 2, 3 of 8 page document View the full content.
View Full Document

ATOC CH 12-14



Previewing pages 1, 2, 3 of actual document.

View the full content.
View Full Document
View Full Document

ATOC CH 12-14

141 views


Pages:
8
School:
University of Colorado at Boulder
Course:
Atoc 1060 - Our Changing Environment: El Nino, Ozone, and Climate
Our Changing Environment: El Nino, Ozone, and Climate Documents

Unformatted text preview:

1 Sarah Rose CH 12 LONG TERM CLIMATE REGULATION Faint Young Sun Paradox sun puts out 30 less energy during the early Solar System increasing brightness ever since increasing present day luminosity most likely solution to paradox is the greenhouse effect enough greenhouse gases would warm Earth enough to stay above freezing Energy Balance with Faint Sun Global average surface temperature Energy in from sun Energy out from black body radiation from top of atmosphere Surface temperature warmer then top of atmosphere due to green house effect Based on assumptions we gather Earth was frozen 2 Gyr reality stromatolites show photosynthesis by 3 5 Gyr conclusion earth not completely frozen at all times 2Gyr ago CO2 most likely warmed Earth smaller continents less weathering less CO2 removal more CO2 impact degassing of planetismals and volcanoes more CO2 weathering of seafloor less CO2 1 000 times the current amount of CO2 would have been needed to keep the Earth from freezing relatively small in comparison to the amount of carbon in total carbon cycle Methane in early atmosphere prior to formation of life impact degassing produced CH4 reaction of rocks on seafloor produce CH4 estimate concentration prior to life 10 100 ppm today 1 75 ppm earliest organisms methane producing bacteria methanogenic 1000 ppm 3 8 2 3 Gyr ago Negative feedback involving methanogenic bacteria and haze production could have controlled Archean climate 2 5 3 8 Gyr Tillites mixture of cobbles pebbles sand and mud packed together to form rocks mix of sediments pushed together by glaciers Moraines debris carried by glaciers as they move and deposited in piles of rubble hills created by glaciers pushing dirt and rocks 2 Glacial striations parallel scratches on rocks formed when moving glaciers drag other rocks across their surface gouges cut by rocks frozen in moving glaciers Dropstones misplaced chunks of rock that occur in finely laminated sediments Loess fine grained sediment produced by glacial



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view ATOC CH 12-14 and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view ATOC CH 12-14 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?