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Year 1
Oceans and Climate
Case Studies
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Cards (26)
eocene was
55-40
mya
eocene had
560
parts
per
million
in the atmosphere
eocene was
14C
warmer than today
eocene has increased
oceanic
mixing leading to increased
meridional
current, leading to more
heat
tides were very
energetic
during the eocene
pacific ocean had thee overturning
circulation
venus is an example of an
extreme greenhouse
venus has
high
levels of
CO2
(
97
%) which traps
heat
from
sun
venus has
thick clouds
that trap
heat
Goldilocks zone
distance from a star from which water can exsist as a liquid
venus receive
twice
as much
sunlight
as we do
venus has a surface temperature of
450C
venus has a
slow
rotation,
117
earth days are one venus day
venus spins
backwards
venus is
prograde
but
rotates retrograde
venus allowed heat to escape at
night
venus in its youth could have
hosted
life
venus had a
resurfacing
event
1
bya causing
extreme greenhouse effect
Snowball earth was more
slushy
than
frozen
easy to
freeze earth
but hard to
unfreeze
snowball earth had
-110C
at poles
snowball earth was
715-630
mya
snowball earth had
oceans
you need
120
ppm to
melt
to
snowball earth
ice melted with
geothermal heat flux
from the
mid-atlantic ridge
sponges are found during
snowball earth
meaning that the
oceans
must of been
ice free