Week 6 Flashcards
What was the result of human migrations
Human DNA altering as we spread around the world
What is the constraint of DNA analysis
It is hard to find samples from old relatives
What effects required adaptation in human history
- Weaker summer monsoons - long term drying in africa and the Nile
- Intensification of ice sheets - long term cooling and weakening effect on monsoons
When was the first evidence of agriculture, what did it consist
12 kyrs years ago, Cultivation: wheat, rye, barley
Domestication: pig Goat, Sheep
What is RWP
Roman Warm Period
What was the impact of climate on early civilizations
Early egyption - ferticle “cresent”
- turned to weaker monsoons, resulted in droughts
Mayan civilization - drought
Anasazi people - Drought (found in tree ring studies)
What is the Early Anthropogenic hypothesis
There was an anomalous rise in CO2 8000 yrs ago, blammed on humans.
- critics, too few humans to have a large impact.
What are the best paleoclimate records for the past 2000 years and 500 years
2000 years- laminated ice cores and lake sediments
500 years
Tree rings
Multi-proxy and multi archives are useful because?
They compare all tpes of paleoclimatology data and give us the bigger picture in terms of how the climate has changed in the past.
Was the little ice age local or global
It is difficult to tell. but records exist all over the globe.
What caused a year without a summer.
what were the ramifications?
Causes - Lower insolation - Mt Tambora eruption Effects - Lower temp 0.4-0.7 -Food shortages - Western migration in the US - Inventions in europte
Down fall of instrumental Era?
Not enough information due to sparse observatories, ect.
Benefits of the instrumental Era?
We are making progress and information is starting to correlate, giving us appreciable values.
When was the little ice age? how cool was it globally?
1400-1900 AD
-1.4 C
Why 1816 special? name some phycal characteristics about it
It was “the year without a summer”
- lower insolation
- Mt tambora eruption
