Ch. 24.7: Climate.

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Presentation transcript:

Ch. 24.7: Climate

Climate =______________________ Depends on_________________________ Climate Regions: Tropical: Hot & wet or Hot w/ wet & dry seasons Dry: Desert Temperate marine: humid w/ mild winters Temperate continental: cold, snowy winters Highlands: mt. regions, cool & wet Polar: tundra & ice cap

Factors Affecting Temperature Altitude:________________________ Latitude: _________________________________ ________________________________ Distance from bodies of water: ______________________________

Factors Affecting Precipitation Latitude __________________________________ Distribution of air pressure systems & global winds Mt. Barriers

Mt. Barriers Warm air is pushed up by mt. Dry Air on opposite side Condenses Precip Dry Air on opposite side Desert - like

SHORT TERM Climate Change: El Nino ___________________________________ Ocean currents in Pacific______________ Result: Abnormal weather When: Every ______ yrs

El Nino year

Climate Change: Ice Age Naturally Occuring & Long Term Change When: 4 major ice ages in last 2 million years Last one ended 10 000 yrs ago Why: http://www.pbs.org/wgbh/nova/ice/chill.html

Icehouse vs. Greenhouse LOW 18O:16O HIGH 18O:16O Icehouse vs. Greenhouse ICE HOUSE = Ice present @ poles GREEN HOUSE= NO ice present @ poles

Causes of Ice Ages 1. www.atmo.arizona.edu/.../sec5/robust.html

2. Changes in Solar Radiation (solar cycles)

Causes of Ice Ages continued 3. Volcanic Activity

55 Ma: Uplift of the Himalayas Ice Ages - Cause 55 Ma: Uplift of the Himalayas 4.

Ice Ages: Cause 5. Change in OCEAN Circulation

Ancient Ice Age: Snow Ball Earth Ice covered Earth ~ 2.4 bya (end of Precambrian Time) Global temps: ~ - 74 F 6. Biology Driven Ice Age = Snowball Earth

Global Warming Debate: How much is natural? How much is due to burning fossil fuels? Reducing CO2 levels could limit global warming http://yosemite.epa.gov/oar/globalwarming.nsf/content/Climate.html

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