Lecture 10 Eco1

Lecture 10 Eco1 - 2/19/09 Lecture 11 Ecosystems I: Climate...

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2/19/09 1 Lecture 11 Ecosystems I: Climate Reading Ch 52 2. If the Earth’s axis of rotation suddenly lost its tilt (became perpendicular to its plane of orbit around the sun), the most predictable effect would be a. no more night and day b. a loss of seasonal variation at high latitudes c. a big change in the length of the year d. a cooling of the equator e. the elimination of ocean currents Overview I. Seasons II. Sun intensity III. Air circulation patterns IV. Ocean currents V. Effects of ocean currents VI. El Niño Sun drives everything about climate I. Seasons Earth’s tilt causes seasons summer (in north) - northern hemisphere is tilted toward sun Solstice - longest, shortest day Equinox - 12 hrs day, 12 hrs night Longyearbyen, Norway northern-most town daylight can change 45 minutes/day Singapore on equator daylight changes - seconds
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2/19/09 2 equator - sunlight hits earth perpendicularly - most energy per unit area poles - sunlight hits earth at oblique angle - energy diffuse
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Lecture 10 Eco1 - 2/19/09 Lecture 11 Ecosystems I: Climate...

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