3/17 ERS102 - o 41,000-year cycle Croll also predicted the...

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Exam Next Monday Causes of climate change Important concepts o What causes climate change? What is climate? o Long-term average of day-to-day weather over a specific time period Temperature Precipitation Wind speeds and directions Climate change o Short-term (years to 100’s of years) o Long-term (1000’s of years) What causes Ice Ages? = Glacial period o Changes in the amount of energy at Earth’s surface o Amount of energy that reaches the Earth (or parts of the Earth) o Amount of energy that leaves the Earth Energy from the sun o Sunspots o Insolation= amount of energy from the sun Croll o Seasonal variations in insolations due to shape of earth’s orbit Precession o Affects degree of seasonality (11,000 year cycle) o Perihelion- closest to sun Eccentricity o Affects impact of perihelion position o 100,000 year and 400,000 year cycles Milankovitch o Recognition of the role of axial tilt, or obliquity
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Unformatted text preview: o 41,000-year cycle Croll also predicted the impact of feedback mechanism o Albedo: reflectance of light Plate tectonics o Movement of continents with respect to poles o Formation and erosion of mountain ranges Ca-rich minerals eroded as mountains uplifted. Ca washed to ocean Marine organisms combine Ca with CO2 to form shells. Remove CO2 from atmosphere o Interruption of large-scale weather patterns Change in atmosphere o Large igneous provinces: SO2, dust, CO2 Green house gases o H2O (water vapor) naturally occuring o CO2 (carbon dioxide) naturally occurring/ human activitied o CH4 (methane)naturally occurring/human activated o NiO2 (nitrous oxide) o CFCs (chlorofluorocarbons) o HFCs (halofluorocompounds) o PFCs (perfluorcarbons)...
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3/17 ERS102 - o 41,000-year cycle Croll also predicted the...

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