milankovitch cycles Flashcards
1
Q
orbital variations
A
lead to a variation in the intensity of insolation received at the earths surface
2
Q
3 mechanisms
A
-stretch (eccentricity) of orbit
-axis tilt (obliquity)
-wobble (precession)
3
Q
variations
A
of up to 25% in the amount of incoming insolation at earths mid-latitude
4
Q
time frame of stretch
A
100,000 year cycles
5
Q
earth orbit when its most elliptic
A
23% more
6
Q
variation of tilt over last million years
A
22.1 and 24.5 degrees
7
Q
timeframe the cycle of tilt operates over
A
41,000 years
8
Q
affect tilt has on climate
A
gradually makes seasons milder, resulting in warmer winters and cooler summers
9
Q
how long does one wobble cycle take
A
25,771.5 years
