02 - ECOSYSTEMS I

02 - ECOSYSTEMS I - ECOSYSTEMS I: CLIMATE I. Seasons a....

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ECOSYSTEMS I: CLIMATE I. Seasons a. Earth’s tilt causes seasons; summer (in north), northern hemisphere tilted toward sun b. Solstice – longest, shortest day c. Equinox – 12 hrs day, 12 hrs night i. Longyearbyen, Norway; northern-most town, daylight can change 45 minutes/day ii. Singapore on equator, daylight changes – seconds II. Sun intensity – latitudinal variation in sunlight intensity – due to earth’s shape a. Equator – sunlight hits earth perpendicularly – most energy per unit area b. Poles – sunlight hits earth at oblique angle – energy diffuse c. Same # hours light / different amounts heat d. Net movement of energy from equator to poles i. Global air circulation ii. Ocean currents e. Warm air rises, air cools as rises from earth, cooler air falls f. Warm air holds more moisture than cool, when air cools – condensation happens – clouds, precipitation III. Air circulation patterns a. Hadley cells i. High temperatures in tropics- evaporation ii. Warm, wet air rises, cools, rains in tropics
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This note was uploaded on 12/10/2008 for the course BILD 632282 taught by Professor Henter during the Fall '08 term at UCSD.

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02 - ECOSYSTEMS I - ECOSYSTEMS I: CLIMATE I. Seasons a....

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