5.6: Polar Ozone Destruction

Question 1

When is the Antarctic O3 layer thinnest?

Answer 1

Spring

Question 2

what causes the thinning of the ozone layer during spring?

Answer 2

catalytic destruction by Cl⦁ (rise in ClO⦁)

Question 3

what is the role of polar stratospheric clouds in polar ozone destruction? in the spring

Answer 3

efficiently absorbs HNO3 and ClONO2 (converted to Cl2)

Question 4

what is the role of polar stratospheric clouds in polar ozone destruction? in the winter

Answer 4

polar vortex, no sun, absorb HNO3 and ClONO2

Question 5

in winter the ozone hole __ because the O3 layer ___

Answer 5

• decreases
• increases

Question 6

in the spring the ozone hole __ because the O3 layer ___

Answer 6

• increases
• decreases

Question 7

as stratospheric Cl increases, the O3 hole…

Answer 7

increases

Question 8

when does the seasonal O3 hole end?

Answer 8

when the sun comes back after the dark/polar winter and evaporates the clouds

Question 9

how does the greenhouse effect affect temperatures in the stratosphere?

Answer 9

decreases

Question 10

how does the greenhouse effect affect temperatures in the troposphere?

Answer 10

increases