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25 Cards in this Set
- Front
- Back
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Sun spots |
variations in solar activity 11-22 years related to social/ climatic events |
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Milankovith |
published theories which solved the mystery of the ice ages |
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Tilt of the earth on axis |
21-24.5 degrees with 40,000 year cycle |
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Variation in time of far position and near position |
21,000 year cycle |
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Solar radiation in the hemispheres |
only in the northern hemisphere |
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Rising in Canada causes what? |
Changes in climate/ colder and longer winters |
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Krakatoa |
global ash covering and blocking the sunlight caused a 5 year climate change |
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Palio dating methods |
oxygen 16/ 18 isotopes |
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The past 12,000 years |
holoscence= present inter glaciacer |
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Warmest period in past glacier time? |
2,000 year period centered around 7,000-8,000 years BP |
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Period known as the 'Little Ice age' |
600 PB to 200 PB= 400 year time period |
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Washington and Valley Forde |
1780-1880's got close to being a continental advance |
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Inadvertent climate change due to man |
c02 increase- 30% increase since 1900's The climate of cities |
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Urban heat island |
cities are warmer by and average temp of 2-5 degrees |
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Urban heat island is _________ in the winter |
stronger |
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Urban heat island is _________ during the day |
weaker |
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Evaporative cause of city heat |
in the city, everything is dry by design= little to no evaporative cooling/ 55% of the cause |
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Surface area heat in cities |
side area is more than top area/ sides emit IR and it is trapped between sides= warmer temp in the city |
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Wind in the city |
builings create friction= redirection of wind down the city canyons either up of down/ less wind in the city |
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Frequency of fog in the city |
30-50% more because topographicly located in valleys/ valleys have more fog |
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Precip in cities |
cities have slightly to moderatly more precip than country side/ 10-30% more |
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Advertant climate change caused by humans |
Cloud seeding |
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Cloud seeding application |
1. to prevent and reduce hail 2. Snow fall increase 3. fog into snow 4. Warm cloud seeding mechanism= more precip |
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Argon half life |
very long half life with the ability to date igneous rocks that are not very old |
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k40 |
long half life- no short term precision |
