Lectures_3 - Seasons What are the drivers of the seasons?...

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06/06/10 EATS 1011 0.3 Winter Seasons What are the drivers of the seasons? Orbital parameters Ellipticity of orbits Perihelion 147x10 6 km, 4 th January Aphelion 153x10 6 km, 4 th July 7% change in insolation Insolation: Sun’s energy averaged over 24 hours Fig. 2-15, p.44
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06/06/10 EATS 1011 0.3 Winter Fig. 2-15, p.44
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06/06/10 EATS 1011 0.3 Winter Seasons ctd Obliquity: Tilt Rotation axis – pole star 23.5° Solstice N. pole Sun 21 st June, Sun overhead at noon at tropic of Cancer (23.5N) S. Pole Sun 21 st December, Sun overhead at noon at tropic of Capricorn (23.5 S) Regions of perpetual day and night Equinox Axis 90 to Sun-Earth line vernal 21 st march Autumnal 21 st September Length of Day
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06/06/10 EATS 1011 0.3 Winter Fig. 2-17, p.45 Seasonal Heating
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06/06/10 EATS 1011 0.3 Winter Fig. 2-19, p.46 1 m 2 1 m 2 2 m 2 24 hrs Daylight 24 hrs darkness
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06/06/10 EATS 1011 0.3 Winter Fig. 2-22, p.50 AM PM PM AM
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This note was uploaded on 06/05/2010 for the course EATS 1011 taught by Professor Johnm during the Winter '10 term at York University.

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Lectures_3 - Seasons What are the drivers of the seasons?...

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