milankovich cycles Flashcards
Eccentricity how many years?
100,000
eccentricity what is it?
changing from eliptical to circular orbit
what is term for point when earth is furthest from the sun
aphelion
what is term for when earth is closest to the sun
perhelion
what is present day eccentricity of earth orbit
6%
is present day eccentricity high?
no, almost minimum
what is maximum eccentricity?
between 20-30%
what is obliquity
the tilt of the earths axis
how long is an obliquity cycle?
41,000 years
how many can the tilt change
3 degrees
what does a small tilt mean for climate?
Ice sheet growth due to warm winters bringing moisture and snowfall
what is precession?
a combination of obliquity and eccentricity (wobbling)
what is current tilt of earth (obliquity)
23.5 degrees
what is current tilt of earth (obliquity)
23.5 degrees
how long are precession cycles
19,000 or 23,000
what are the effects of precession
greater seasonal contrasts
which milankovich cycle goes in 41,000 yrs
obliquity
which cycle goes in 19,000 or 23,000 years
precession
which cycle goes in 100,000 years
eccentricity
which cycle is to do with tilt
obliquity
which cycle is to do with tilt and orbit
precession
which cycle is to do with orbit
eccentricity
where can evidence be found in rocks
Blue Lias
Kimmeridge Clay
What cycle is shown in Blue Lias
Obliquity
