Past paper questions

Question 1

Define and calculate the lifetime of NO2 in hours under daytime conditions?

Answer 1

tNO2=1/k[OH]

Question 2

We assume of lifetime of NOx (tNOx) and lifetime of NO2 are the same (tNO2)- why?

Answer 2

There is fast cycling between NO and NO and there is no major losses of NOX by loss of NO

Question 3

Given that [O3] at 40 km is 5 x 1011 molecules cm-3, sketch approximate
vertical profiles of ozone and atomic oxygen concentrations throughout the
stratosphere.

Answer 3

X-axis=conc 10^8 to 10^12
Y axis- height 10-50km
Concentration rises- peaks at 25-30km and then falls gradually