Wednesday, November 22, 2017
NOAA “reels in” data on Utah’s winter ozone problem

NOAA “reels in” data on Utah’s winter ozone problem

Novel research method allows precise tracking of ozone production rates

A deep sea fishing rod is probably not the first tool that comes to mind when thinking about how to study air pollution in a remote inland desert, but it’s the heart of a new NOAA system that has given scientists a minute-by-minute look at how quickly the sun can convert oil and gas facility emissions to harmful ground-level ozone.

Tethersonde Deployment

Tethersonde Deployment

NOAA researchers deploy a “tethersonde” - an instrumented weather balloon tethered to a fishing rod driven by a computer-controlled electric motor - to study the rate of ozone formation in Utah’s remote Uinta Basin in 2013. Credit: NOAA
Results from a new NOAA study using this method to examine the formation of ozone pollution in eastern Utah's Uinta Basin has revealed just how quickly sun, snow and chemical vapors emitted by oil and gas facilities produce ozone levels that can be harmful to human health.

Data collected during field work in 2013 showed that under proper conditions, ozone levels rose as much as 10 ppb per hour. Over the course of a week, ozone levels surged from a background of 40 parts per billion to 165 ppb - more than double the federal ozone standard of 75 ppb.

“This study ties up a lot of loose ends from our earlier work,” said Russ Schnell, deputy director of the Global Monitoring Division and lead author of the study. “What’s new is the method we developed to conduct this study. We can now see how ozone is being formed in real time over the space of minutes and how it’s distributed in the air column.”

Studying Ozone Formation

Studying Ozone Formation

NOAA researchers studying ozone formation in Utah’s Uinta Basin sampled the atmosphere using an innovative, tethered weather balloon during the winter of 2013. Credit: Patrick Cullis/NOAA-CIRES
Dubbed the “tethersonde,” the sampling system mates a deep sea fishing rod to a standard weather balloon carrying an ozone-measuring instrument and radio transmitter. Driven by an electric motor and controlled by custom software, the rig allows researchers to raise and lower the balloon to specific altitudes at precise rates. 

In addition to providing better data, the system also saves researchers money, Schnell said. A single ozone profile obtained with a traditional weather balloon costs between $1,200 and $1,500 because the balloon and instrumentation are rarely recovered. 

“Now we can do 100 profiles for the same cost,” Schnell said. “We can cycle a balloon through an up-and-down profile in less than 30 minutes, which gives us the ability to understand ozone formation over time and space at a high resolution. We can repeat the cycle up to 40 times in a day, then test the calibration of the instrument at the end of the day.”

Ozone pollution is typically a summertime phenomenon associated with large, urban areas. The Green River Basin in Wyoming, another major energy field, also suffers from high winter ozone levels.

High in the stratosphere, ozone protects life on Earth from the sun’s harmful ultraviolet rays. When elevated levels of ozone are trapped near the ground, it can impair breathing and aggravate lung diseases such as asthma and emphysema. The Environmental Protection Agency recommends that people, especially those in sensitive groups — children, the elderly, and anyone with pre-existing respiratory conditions — limit time outdoors during bad ozone days.

Uinta Basin

Uinta Basin

When winter winds die down in Utah’s remote Uinta Basin, oil and gas emissions and sunlight reflected off of snow cover can produce dramatic spikes of ozone pollution over the course of a few hours, a NOAA study has found. Credit: Patrick Cullis/NOAA-CIRES
The NOAA study showed that while the center of the ozone production zone is the sparsely populated Uinta basin, high ozone levels did spread up the White River valley into the town of Rangely, Colorado, and into portions of Dinosaur National Monument in Utah. Researchers found that the ozone pollution was mainly caused by oil and gas development. A nearby power plant’s nitrogen dioxide emissions did not appear to contribute to the problem.

The study also confirmed the important role played by the reflection of sunlight off of snowpack in amplifying the chemical reactions that convert oil and gas facility emissions to ozone. A previous study in the Uinta Basin in the snow-free winter of 2012 found no episodes of elevated ozone.

The chemical drivers of winter ozone formation in the Uinta Basin differ greatly from summer ozone formation in urban areas.

The research, which included scientists from NOAA, CIRES and INSTAAR, was published September 19 in the Journal of Geophysical Research-Atmospheres. View the study online: To view earlier work, visit:

For more information please contact Theo Stein, media relations for NOAA Research for Earth System Research Laboratory, at 303-497-6288 or by email at

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