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9_GlobalWeather - Biosphere climate patterns and how they...

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Climate patterns influenced by: - spherical shape of Earth - tilt of Earth’s axis - Earth’s orbit around sun higher average temp.; less seasonality in temp.; more seasonality in rainfall lower average temp., higher seasonality in temp. mid & high latitudes tropics Biosphere : climate patterns, and how they influence the distribution & abundance of biodiversity
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Spherical shape of Earth: uneven heating of surface (more direct incidence on equator) uneven heating due to angle of incidence of sunlight (not proximity to Sun) latitudinal variation in temperature: temp. decreases from equator to poles
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tilt is constant throughout year Earth is tilted (23.5° relative to orbit around Sun) Spherical shape + tilt + orbit: basic mechanism causing seasonal variation in temperature Northern summer: N. hemisphere tilted towards Sun: - more direct sunlight - longer days Southern summer: S. hemisphere tilted towards Sun Tropics: more direct sunlight throughout year: - higher average temp., - less seasonal as Earth orbits Sun: - change in sun equator (where sun hits surface perpendicularly); - seasonal change in uneven heating
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Tropics : rainfall seasonality (wet & dry seasons) Oscillation: caused by spherical shape, orbit & tilt: site of most heating changes along the year:
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