System Earth Ch 14

Question 1

glacial striations

Answer 1

directions of past glacial movement. These are rocks trapped under moving glaciers

Question 2

how does oxygen isotope record holding work?

Answer 2

colder temperature, more 18O in CaCO3 because the minerals incorporate it more easily.

Question 3

oxygen ratio notation

Answer 3

delta where 18O is the ratio of 18O to16O so a positive delta 18O means colder temperatures. 16O is lighter so more in the atmosphere

Question 4

what are the stats during glacials?

Answer 4

9-10 degrees and 200ppm CO2

Question 5

when did the whole periodicity mess up?

Answer 5

700,000 years ago

Question 6

eccentricity

Answer 6

period: 100,000 years
how eliptical the orbit is

Question 7

obliquity

Answer 7

period: 41,000 years
tilt of the earth - between 22 &24. 5 degrees - responsible for seasonal changes

Question 8

precession

Answer 8

period: 26,000 years
spinning top idea
has changed through the years

Question 9

current eccentricity value

Answer 9

0.017 (varies between 0 and 0.06)

Question 10

how do you best describe the glacial and interglacial variation?

Answer 10

as two steady states but when you push them too far, you end up in the other steady state.

Question 11

ice albedo feedback

Answer 11

positive loop

Question 12

evidence from ice cores

Answer 12

data up to 800,000 years ago. Contains air bubbles

Question 13

biological pump

Answer 13

a very active biological pump removes the CO2 from the atmosphere. The CO2 is then stored elsewhere. With 100% efficiency of the pump, you would have 165 ppm CO2