Geol30_08_Lecture_13b

Albedo more ice etc a positive reinforcing feedback

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: er direction... Continued volcanism causes CO2 levels to rise Eventually, CO2 levels became very high Earth warmed up--perhaps very rapid up-- Cf. enhanced greenhouse effect Ice melted near equatorial regions Albedo decreased, accelerating the warming , g g Evaporation increased, increasing water vapor in the atmosphere The Freeze-Fry: The Fry, cont. FreezeGreenhouse effect became even stronger, stronger, accelerating the warming CO2 levels now very high Atmosphere is incredibly hot (possibly ~50C = 122F) ~50 122 "Hothouse world" 28 2/19/2008 Snowball Earth: Explaining the geology Carbonates directly over tillites, tillites, Explanation: Snowball conditions rapidly changed to hothouse conditions Return of BIFs, Explanation: Ocean was capped by ice for ~10 million years Photosynthesis effectively shut down & seawater became anoxic 29...
View Full Document

Ask a homework question - tutors are online