The impact Of burning fossil fuels at today’s extreme weather #Jet_StreamFebruary 12, 2019
A new study warns that the continued burning of fossil fuels will likely lead to even more extreme summers than that of 2018 because of its impact on the jet stream.
In a study published in Science Advances October 31 , Michael Mann, professor of atmospheric science and director at Penn State University, along with an international team of climate scientists, identified how the faster warming of the Arctic twists the jet stream into an extreme pattern that leads to persistent heat and drought extremes in some regions, with flooding in other areas.
The researchers used climate models to predict changes in the occurrence of so-called Quasi-Resonant Amplification (QRA) events associated with persistent weather extremes.
Heat and drought in California led to the worst wildfire season ever recorded.
The extremely wavy pattern, called “quasi-resonant amplification,” was evident during the extreme summer of 2018, Mann said.
What’s with the jet stream and extreme weather events?
“It played out in real time on our television screens and newspaper headlines in the form of an unprecedented hemisphere-wide pattern of extreme floods, droughts, heat waves and wildfires,” Mann added.
How the QRA plays a role Mann and his colleagues, in previous work, showed the connection between extreme climate events and climate-induced changes in the jet stream.
While researchers cannot accurately identify QRA events in climate models, one thing the climate models capture very well is temperature change.
If these countries, through mid-century, switch to cleaner coal-burning technology, then the mid-latitude areas of the world will warm and Arctic Amplification will diminish.
Cloud condensation nuclei (also known as cloud seeds) are small particles typically 0.2 µm, or 1/100th the size of a cloud droplet on which water vapor condenses. CCNs are aerosols, an aerosol is a colloidal suspension of microscopic particles dispersed in air or gas. The aerosols can be a combination of solid particles and liquid compounds (liquid water or organic residues). Examples of CCNs include: – dust particles (c…