5. Concentrations: In September 2016, the concentration of CH4 measured at Mauna

Question

5. Concentrations: In September 2016, the concentration of CH4 measured at Mauna Loa Observatory in Hawaii (T = 75°F, z = 3.4 km) was 1863.21 ppm. The concentration of CH4 as measured at South Pole Station in Antarctica (T = 28 °F, z = 0.015 km) is only 1806.91 ppm. Calculate the ratio between the number density of CH4 at Mauna Loa Observatory and at South Pole Station. You can assume that h = 7.4 km. (Point of interest: Mauna Loa Observatory has the longest, continuous, direct measurements of atmospheric CH4 concentrations in the world!) (7 pts) concentrati Statton in Antarstic -28 iven the difference in concentrations of CH4 at Mauna Loa and South Pole Station, are emissions of 4 likely to be greater in the northern hemisphere or the southern hemisphere? (2 pts)

Explanation / Answer

The ratio of the number density is not dependent on the temperature.

So the ratio simply comes out to be the ratio of the concentration of the two ratio =1863.21/1806.91=1.03115

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