Constructing a Model of ppbv of Surface Ozone

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Presentation transcript:

Constructing a Model of ppbv of Surface Ozone GLOBE Ozone Protocol Learning Activity Explore. Discover. Understand.

Earth’s Atmosphere Explore. Discover. Understand.

"The Rest" of Earth's Atmosphere Explore. Discover. Understand.

Look at the Numbers Composition of Earth’s Dry Atmosphere (1976 Standard Atmosphere*) Gas Percentage Running % N2 78.084 O2 20.948 99.032 Ar 0.934 99.966 CO2 0.0314* 99.9974 He,Ne,Kr,Xe 0.00254 99.99994 Explore. Discover. Understand.

Expressing concentration of a gas parts per billion volume number density Explore. Discover. Understand.

Let’s look at volume of ozone in this classroom Example: Ozone (trace gas) is probably ~ 20 ppbv in this room. This means that ~ 20 billionths of the volume of gas in this room is ozone. Suppose this room is 6 m wide by 9 m long by 3 m high V = 6 m x 9 m x 3 m V = 162 m3 = 162,000,000 cm3 = 162 x 106 cm3 So what is the volume of ozone in this room? (20 billionths)(162 million cm3) = (20 x 10-9)(162 x 106 cm3) = 3.240 cm3 ~ 3 cm3 ozone in this room Explore. Discover. Understand.

How many molecules of gas in 1 cm3? From ideal gas law, in 1 cm3 of air at 25°C and 1 atm, there are 2.5 x 1019 molecules “25 billion billion” molecules in 1 cm3 Explore. Discover. Understand.

Let’s look at number density for ozone Example: Ozone (trace gas) is probably ~ 20 ppbv in this room What is number density of ozone (2.5 x 1019 molecules/cm3)(20 x 10-9) =50 x 1010 molecules ozone/cm3 =500 x 109 molecules ozone/cm3 or 500 billion molecules ozone/cm3 Explore. Discover. Understand.