{ natural changes in climate. 8.9 long term and short term changes in climate 8.10 feedback loops...
TRANSCRIPT
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{Natural Changes in Climate
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8.9 Long Term and Short Term Changes in Climate
8.10 Feedback Loops and Climate
8.11 Clues to Past Climates
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The Earth’s climate is not static and goes through natural cyclic changes (ex: Ice Age 20000 years ago)
Changes in climate are triggered by changes in Earth’s energy balance (ie: if the Sun’s energy is absorbed differently, climate changes)
Long Term and Short Term Changes in Climate
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Continental Drift When continents move, ocean currents
and wind patterns change causing changes in climate
Long Term Changes
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As mountain ranges form, regional climates change
Long Term Changes
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When surrounded by more larger bodies of water, you get more moderate climates (ie: Southern Hemisphere)
When you have fewer, large bodies of water you
get harsher winters and hotter summers (ie: Northern Hemisphere)
Long Term Changes
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Over the last 400 000 years or more, climate has continually cycled from ice ages to warmer interglacial periods about every 100 000 years.
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Earth’s orbit around the sun changes due to eccentricity, tilt and its wobble
Why do Interglacial Periods and Ice Ages Happen?
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A decrease in the energy from the Sun causes lower temperatures (ice age) and an increase will cause higher temperatures (interglacial)
http://www.youtube.com/watch?v=6lbJrvtxWNE
Why do Interglacial Periods and Ice Ages Happening?
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Albedo: a measure of how much of the Sun’s radiation is reflected by a surface. (related to percent of radiation reflected) ice and snow have high albedo (therefore it’s cold) grass and trees have a low albedo (therefore it’s
warm)
Albedo
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an increase in the Earth’s temperature causes ice to melt, so more radiation is absorbed by Earth’s surface, leading to further increases in temperature
Albedo Effect
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Is the albedo effect a positive or a negative feedback loop?
It is a positive loop!
Albedo Effect
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Small term variations occur over 10s of years to 100s of years
Short-Term Variations In Climate
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Volcanic Eruptions More dust in the air inhibits Sun’s energy
from reaching that area causing a temporary cool down
Short-Term Variations In Climate
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Mount Pinatubo in the Phillipines erupted in June 1991 There was so much lava and ash in the
stratosphere that the amount of sunlight reaching earth’s surface reduced by 10%
Global temperatures lower an average of
Volcanic Eruptions
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Air and Ocean Currents Changes in the circulation of these currents
can result in climate changes
If the salinity of the water changes, it can have an effect on the thermohaline circulation
El-Nino effect occurs every 3-7 years. It involves a change in prevailing winds that causes changes in climate
http://www.youtube.com/watch?v=7FVZrw7bk1w
Short Term Variations in Climate
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Proxy Records Stores of information in tree rings, ice
cores, and fossils that can be measured to give clues to what the climate was like in the past
How do we study climate change?
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Ice has tiny air bubbles that have been trapped for thousands of centuries and can be tested for various gases
Ice Cores
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http://www.youtube.com/watch?v=JS2PhRd_5NA
Ice Cores
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The thickness of a tree ring indicates the growing conditions Warm, wet year will produce a thick ring Cold, dry year will produce a thin ring
Tree Rings
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Corals have layers of growth each season and give clues about the temperature of the ocean
Coral Reefs
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Scientists can look at rocks and layers of soil for clues like plant pollen or fossils that would give us an idea about what the climate was like
In the ocean floor, scientists can find fossils of marine plants and animals that may not have been there previously suggesting a change in climate
Rocks & Fossils
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Read Section 8.9 (pg. 348-353) answer questions #1, 3, 4, 8
Read Section 8.10 (pg. 355-357) answer questions #3, 5, 7
Read Section 8.11 (pg. 358-361) answer questions 1, 4, 5
Homework