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B. A New Tool Gives Scientists New Insight into Ozone

Narrator: This is Science Today. A new way to measure the amount of stratospheric ozone present in the upper troposphere has been developed by scientists at the Lawrence Livermore National Laboratory. Physicist Cyndi Atherton of the Atmospheric Sciences Division explains that the stratosphere is where the ozone hole is and the troposphere is the lowest layer of Earth's atmosphere, where ozone is a pollutant and greenhouse gas.

Atherton: So the two layers are very different in terms of how ozone is formed and what the role in the ozone is. Our group has a global model, so it's three-dimensional and it goes all the way up to the troposphere and the stratosphere, which is very important. In the past, people only modeled either the troposphere or the stratosphere and the other one was just pretty boundary condition, the computers just couldn't support it, but now we can.

Narrator: This gives researchers a way to realistically look at how much ozone is being formed from pollution in the troposphere versus how much is coming from the stratosphere.

Atherton: So it gives us an idea of how effective controls of hydrocarbons and nitrogen oxides can be in controlling ozone.

Narrator: For Science Today, I'm Larissa Branin.