MSC 220 Lecture Notes - Lecture 14: Continental Shelf, Ice Rafting, Carbon Cycle
13 Oct 2016
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Document Summary
A trend to cooler temperature and bigger ice volume over last. Oscillations: 100,000yr and 41,000yr cycles, with less important 23,000 year cycles: ice rafted debris, coral reefs and sea level data. Corals tend to grow near sea level and follow the sea level. Last glacial period ice sheets: insolation = amount of radiation from the sun. Increased albedo = radiation reflected = cooler temperature: two factors were different. During last glacial period, was similar to today"s values: of earth"s continents were covered in ice up to 1 mile thick. Low greenhouse gas concentrations: land was depressed (usually by 30% of ice thickness) Movement of glaciers: caused erosion by abrasion and plucking, scars from these movements seen today as glacial striations, moraines and glacial valleys were formed, tophat question. It causes intensification of the removal of co2 from the atmosphere because of increase in weathering.
