Thursday, February 2, 2023

The link between winter storms and global warming

the world is heating upincluding winter.

(See: US death toll from Hurricane Elliot rises to 50).

Although, The United States Has Experienced Severe Winter Storms In recent years, more experts have been taking a closer look at the link between these episodes. Extreme cold and climate change.

opposite of the relationship between global warming and heat waves, behavior of someone who is too direct winter storm It is controlled by complex atmospheric dynamics that are more difficult to study.

still, “There are some aspects of winter storms (…) where the links to climate change are quite clear,” Said to AFP Michael Mann, a climatologist at the University of Pennsylvania.

For example, warming of water bodiessuch as lakes or oceans, affect the amount of snow it’s falling.

(See: Christmas storm kills at least 26 people in the United States).

in the United States, ‘Lake Effect Snow’ are found around the Great Lakes region border with Canada.

buffalo townwhich is situated on the banks of a great Lakes, It was badly hit by deadly snow over the Christmas weekend.

collision between cold air coming from the north with hottest water Convection occurs from these lakes, which leads to snowfall.

(See: How do I know if my flight to the United States was cancelled?)

“The warmer the lake temperature, the more moisture (there is) in the air and the more likely lake-effect snow is”Mann wrote in A 2018 article.

“Unexpectedly, we see a long-term increase in lake-effect snowfall as temperatures have increased over the last century,” Explained.

Although, America have experienced severe winter storms in recent years, and experts are watching closely relationship Between these episodes of extreme cold and climate change.

However, there is no consensus on other mechanisms, such as Effects of Climate Change on the Polar Vortex and jet air streams.

the polar vortex is an air mass above North PoleLocated high in the stratosphere.

humans They reside in the troposphere and the stratosphere is located just above it.

This vortex is surrounded by a band of rotating air, which acts as a barrier between the air Cold air from the north and warm air from the south.

as polar vortex weakens, this band of air begins to ripple and acquires a more elliptical shape, bringing more cold breeze in the south.

Snow in the United States.

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According to a 2021 study, This type of error is happening more often And, when it does, it echoes further down in the atmosphere for the next two weeks, where jet stream.

This air current, which flows from west to east, again follows the boundary between cold and hot airIt then dissipates in such a way as to allow cold air from the north to descend at lower latitudes, especially the eastern America.

“Everyone agrees that when the polar vortex is disturbed, the likelihood of severe winter weather increases,” the newspaper’s head writer Judah Cohen told AFP. studies and climatologists From the Center for Atmospheric and Environmental Research (AER) Analysis.

and the polar vortex ‘Spread’ exactly what was seen just before hurricane in america This December, he noted.

(See: New York asked to declare winter storm disaster area.)

The same phenomenon was also observed in February 2021, when a strong cold wave It hit Texas and caused massive power outages.

But the debate centers on one key question: What is the reason for these increasing disturbances in the polar vortex?

According to Cohen, these changes attached Changes in the Arctic, accelerated by Climate change.

On the one hand, the rapid melting of sea ​​ice and, on the other hand, an increase in Ice sheet in Siberia.

“It’s a topic I’ve been studying for more than 15 years and today I’m more certain of that link than ever”he told AFP.

However, this last point remains a ‘ongoing discussion’ inside of scientific community.

“Climate models still do not capture all of the underlying physics that may be relevant to how climate change is affecting jet stream behavior,” Pure.

Therefore, more studies will be needed in Next year To uncover the secrets of these complexes chain reactions.

AFP

Nation World News Desk
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