Ozone fears as space race hots up

As the space race continues there are warnings that the projected growth in rocket launches for space tourism, moon landings, and perhaps travel to Mars may further impact the ozone layer.

The study by the National Oceanic and Atmospheric Administration (NOAA)says while dreams of a new era of space exploration may spell catastrophe for the planet.

“Kerosene-burning rocket engines widely used by the global launch industry emit exhaust containing black carbon, or soot, directly into the stratosphere, where a layer of ozone protects all living things on the Earth from the harmful impacts of ultraviolet radiation, which include skin cancer and weakened immune systems in humans, as well as disruptions to agriculture and ecosystems,” it warned.

According to the research a 10-fold increase in hydrocarbon fuelled launches, which is plausible within the next two decades based on recent trends in space traffic growth, would damage the ozone layer, and change atmospheric circulation patterns.

“We need to learn more about the potential impact of hydrocarbon-burning engines on the stratosphere and on the climate at the surface of the Earth,” said lead author Christopher Maloney, a CIRES research scientist working in NOAA’s Chemical Sciences Laboratory. “With further research, we should be able to better understand the relative impacts of different rocket types on climate and ozone.”

Launch rates have more than tripled in recent decades, Maloney said, and accelerated growth is anticipated in the coming decades. Rockets are the only direct source of human-produced aerosol pollution above the troposphere, the lowest region of the atmosphere, which extends to a height of about 4 to 6 miles above the Earth’s surface.

The research team used a climate model to simulate the impact of approximately 10,000 metric tons of soot pollution injected into the stratosphere over the northern hemisphere every year for 50 years. Currently, an estimated 1,000 tons of rocket soot exhaust are emitted annually. The researchers warned that the exact amounts of soot emitted by the different hydrocarbon fuelled engines used around the globe are poorly understood.

The researchers found that this level of activity would increase annual temperatures in the stratosphere by 0.5 – 2° Celsius (or approximately 1-4°Farenheit), which would change global circulation patterns by slowing the subtropical jet streams as much as 3.5% and weakening the stratospheric overturning circulation.

Stratospheric ozone is strongly influenced by temperature and atmospheric circulation, explained co-author Robert Portmann, a research physicist with the Chemical Sciences Laboratory, so it was no surprise to the research team that the model found changes in stratospheric temperatures and winds also caused changes in the abundance of ozone. The scientists found ozone reductions occurred poleward of 30 degrees North, or roughly the latitude of Houston, in nearly all months of the year. The maximum reduction of 4% occurred at the North Pole in June. All other locations north of 30° N experienced at least some reduced ozone throughout the year.

This spatial pattern of ozone loss directly coincides with the modelled distribution of black carbon and the warming associated with it, Maloney said.

“The bottom line is projected increases in rocket launches could expose people in the Northern Hemisphere to increased harmful UV radiation,” he added.

The research team also simulated two larger emission scenarios of 30,000 and 100,000 tons of soot pollution per year to better understand the impacts of an extremely large increase in future space travel using hydrocarbon-fuelled engines, and more clearly investigate the feedbacks that determine the atmosphere’s response. Results showed that the stratosphere is sensitive to relatively modest black carbon injections. The larger emission simulations showed a similar, yet more severe disruptions of atmospheric circulation and climate loss than the 10,000 metric ton case.

The study built on previous research by members of the author team. A 2010 study led by co-author Martin Ross, a scientist with The Aerospace Corporation, first explored the climate impact of an increase in soot-producing rocket launches. A second study performed at NOAA in 2017, on which Ross was a co-author, examined the climate response to water vapor emissions from a proposed reusable space launch system utilizing cleaner hydrogen-fuelled rockets.

“Our work emphasises the importance of ozone depletion caused by soot particles emitted by liquid-fuelled rockets,” Ross said. “These simulations change the long-held belief that spaceflight’s only threat to the ozone layer was from solid-fuelled rockets. We’ve shown that particles are where the action is for spaceflight’s impacts.”