Another New Study Points to the Dangers of Geoengineering the Climate
A recently published study from MIT casts doubt on the safety of the science of geoengineering and outlines potential dangers of the controversial field.
A new study from Massachusetts Institute of Technology is adding to the growing list of concerns around the controversial science of geoengineering. Researchers have found that geoengineering techniques could significantly change extratropical storms and introduce changes to the climate.
Geoengineering is a field of research investigating methods to deliberately manipulate the climate in an attempt to fight climate change. One of these methods is known as solar radiation management (SRM). Proposals for SRM suggest that scientists might be able to replicate the results seen from volcano eruptions. MIT reports:
How can the world combat the continued rise in global temperatures? How about shading the Earth from a portion of the sun’s heat by injecting the stratosphere with reflective aerosols? After all, volcanoes do essentially the same thing, albeit in short, dramatic bursts: When a Vesuvius erupts, it blasts fine ash into the atmosphere, where the particles can linger as a kind of cloud cover, reflecting solar radiation back into space and temporarily cooling the planet.
Researchers have proposed using planes, balloons, or blimps to spray various aerosols into the atmosphere in the hopes of reflecting sunlight and cooling the planet. This type of geoengineering is extremely controversial and previous studies have linked the technology to potentially dangerous outcomes for various parts of the planet.
Now a research team lead by Charles Gertler, a graduate student in MIT’s Department of Earth, Atmospheric and Planetary Sciences (EAPS), has found that “solar geoengineering will not simply reverse climate change. Instead, it has the potential itself to induce novel changes in climate.” Gertler and his team have published the results in the journal Geophysical Research Letters.
Specifically, Gertler’s team found that solar geoengineering could alter what are known as extratropical storm tracks. MIT describes storm tracks as “the zones in the middle and high latitudes where storms form year-round and are steered by the jet stream across the oceans and land.” These storm tracks help create extratropical cyclones, and the strength of the storm tracks determine the severity and frequency of storms known as “nor’easters.” A nor’easter is a storm along the East Coast of North America in which the winds over the coastal area are typically from the northeast.
The researchers used a scenario of solar geoengineering known to climate scientists as experiment G1 of the Geoengineering Model Intercomparison Project (GeoMIP). This project provides various geoengineering scenarios for scientists to run to determine various climate effects. G1 assumes an ideal scenario in which geoengineering blocks enough solar radiation to act as a counterbalance with the warming that would occur if carbon dioxide concentration quadruples.
The team found that the strength of storm tracks in both the northern and southern hemispheres weakened significantly in response to geoengineering. This would mean less powerful storms in the winter, but the researchers say the weaker storm tracks could “lead to stagnant conditions, particularly in summer, and less wind to clear away air pollution.” These changes in wind could also affect circulation of ocean water and the stability of ice sheets.
“A weakened storm track, in both hemispheres, would mean weaker winter storms but also lead to more stagnant weather, which could affect heat waves,” Gertler says. “Across all seasons, this could affect ventilation of air pollution. It also may contribute to a weakening of the hydrological cycle, with regional reductions in rainfall. These are not good changes, compared to a baseline climate that we are used to.”
Gertler further stated that his work indicates that “solar geoengineering is not reversing climate change, but is substituting one unprecedented climate state for another.” In the conclusion to their study the researchers note that “there likely exist other consequences of solar geoengineering that the simulations studied here are unable to simulate.”
https://www.naturalblaze.com/2020/06/another-new-study-points-to-the-dangers-of-geoengineering-the-climate.html