EEB100 Ecology Midterm Study Guide

EEB100 Ecology Midterm Study Guide - 1. Forests 0, 60;...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1. Forests – 0 ° , 60 ° ; Deserts – 30 ° , 90 ° ; Global circulation causes cold, dense, dry air to sink at poles, travels N or S away from pole toward equator; heats and picks up moisture as it travels; ° ° , circulation cells. 2. Causes for deserts – 1. Climate zones are caused by global wind circulation cells; 2. Continental isolation – away from water source; 3. Rain shadow of mountains – tall mountains prevent water vapor from making it over the peak, it condenses before moving over to other side, dry air goes over to the other side. 3. A fantastically wealthy and not-very-environmentally-conscious person decides to build their own island near the equator. They also decide that they would enjoy having a desert environment. They hire you as a consultant on designing the island, which can be any size and have any geomorphology they like. a. How would you explain to the crazy rich person that desert islands (not to be confused with deserted islands) are unlikely at low latitudes? Sunlight strikes at a more direct angle at the equator. Large air masses heat up and rise (as with a hot air balloon). As the air reaches the upper atmosphere it cools, causing water vapor to condense and fall as rain. This creates very warm, wet conditions in equatorial areas, and you tend to find rainforests rather than deserts. b. What are two methods you could use to terraform the island and create a desert, or at least much dryer conditions, on part of it? Determine the prevailing wind direction. Construct a mountain range perpendicular to it so that a rain shadow is created. A desert will form in the rain shadow. Make the island so massive that a desert forms by continental isolation. 4. 1. Thermal Inertia – thermal inertia of water > land or air; oceans will heat & cool more slowly than land; predict greater temp variation in continental interior; ex. 100 cal of heat raises 1 ° C of water, but 5 ° C of land; 2. Continental Isolation – air picks up moisture over ocean; loses moisture as it moves over land; areas inside continent have less rain; 5. Upwelling – winds blow from poles along western coastlines; wind drives surface water currents through friction; Coriolis effect deflects surface water away from coastline; cold, nutrient rich water comes from depth to replace it. Upwelling systems = 1% of ocean, but support 50% of fisheries; largest kelp forests in upwelling area. 6. Imagine you are on a planet that is exactly like eh earth, but rotates in the opposite direction. On which coastlines, west or east would you expect top find more upwelling? You would expect upwelling to occur on the eastern coastlines. Because the earth is rotating in the opposite direction, the coriolis effect is reversed- it will be to the left in the Northern hemisphere and to the right in the southern. Upwelling is driven by the Coriolis effect. On the new planet, winds form the pole traveling down eastern coastlines would have the surface water deflect offshore.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/06/2011 for the course EEB 100 taught by Professor Halpin during the Fall '08 term at UCLA.

Page1 / 3

EEB100 Ecology Midterm Study Guide - 1. Forests 0, 60;...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online