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#jetstream

1 post1 participant0 posts today
Pedro J. Hdez

"50% of the observed shift in the Southern Hemisphere's #jetstream is directly attributable to #globalwarming . The other half is caused by a combination of other climate-related changes. These include the warming of the upper tropical atmosphere, the strengthening of the winds in the stratosphere and the warming of the tropical Pacific. While some of these factors are also influenced by anthropogenic #climateChange , others are more difficult to attribute."

phys.org/news/2025-07-insights

phys.orgNew insights into the jet stream make better climate predictions possibleJet streams are often referred to as the "motor" of global weather: High-altitude wind currents steer areas of high and low pressure, playing a crucial role in shaping our weather. However, how these atmospheric flows are affected by climate change remains uncertain.
*
anlomedad

What you always wanted to know, especially in summer, but never dared to ask

about jetstream and Rossby waves,

Mike Mann has you covered.
Pub-sci article, written 2019 for the curious like you and me.

Where the curtain folds come into existence, and why – and then, what the folds do with the weather on the ground when they stay locked in place – locked for reasons also explained.

Quantum is also used!! 😁 😁 🖖🏽

scientificamerican.com/article

Scientific American · Droughts and Floods May Level Off until 2050, but Then Watch OutBy Michael E. Mann
#climatechange#jetstream#atmosphere
rexi

phys.org/news/2025-07-ocean-at

(like the apparent static storm front from TX to PA, and the 'Gulf formerly known to be of Mexico' turning into a steaming crock pot?)

"The cold blob can disturb the atmospheric #jetstream and storm activities, so it has implications for #extremeweather events in North America and Europe," said Laifang Li, assistant professor of #meteorology and atmospheric science at Penn State.

phys.orgOcean and atmosphere equally responsible for Atlantic 'cold blob,' scientists findA patch of the Atlantic Ocean just south of Greenland is cooling while much of the world warms. The origin of this "cold blob" has been linked to weakening ocean currents that help regulate global climate—called the Atlantic Meridional Overturning Circulation (AMOC). A team of scientists led by Penn State has found a weakening AMOC impacts not just the ocean but also the atmosphere, and that these two factors may contribute equally to the cold anomaly.
#AMOC
O=C=O

Strange Atlantic cold spot linked to century-long slowdown of major ocean current

The #AMOC acts like a giant conveyor belt, delivering heat and salt from the tropics to the North #Atlantic. A slowdown in this system means less warm, salty water reaches the sub-polar region, resulting in the cooling and freshening observed south of #Greenland.

When the current slows, less heat and salt reach the North Atlantic, leading to cooler, fresher surface waters. This is why salinity and temperature data can be used to understand the strength of the AMOC.

The study also found that the weakening of the AMOC correlates with decreased #salinity. This is another clear sign that less warm, salty water is being transported northward.

The consequences are broad. The South Greenland anomaly matters not just because it's unusual, but because it's one of the most sensitive regions to changes in ocean circulation. It affects #weather patterns across #Europe, altering #rainfall and shifting the #JetStream, which is a high-altitude air current that steers weather systems and helps regulate temperatures across North #America and Europe.

The slowdown may also disturb marine #EcoSystems as changes in salinity and temperature influence where species can live.

phys.org/news/2025-06-strange-

#ClimateScience
#ClimateCrisis

Tino Eberl

Rauch von Waldbränden in #Kanada hat am Wochenende für ungewöhnlich orangefarbene Himmelsphänomene über dem Vereinigten Königreich gesorgt.

Die Partikel in der #Atmosphäre streuen blaues Licht, sodass Rot- und Orangetöne dominieren. Die #Rauchwolken wurden durch den #Jetstream über den #Atlantik transportiert.

bbc.com/weather/articles/c4g2k

Orange-yellow coloured sun with silouttes of birds and tv aerials in foreground
BBC WeatherCanada wildfires smoke turns UK skies orangeSmoke from wildfires burning in central Canada was visible in the skies over the UK this weekend.
#Waldbrände#Luftströmungen#Wetterphänomen
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anlomedad

More on Bananas from North Atlantic in 2023, here by #MattEngland, Stefan #Rahmstorf et al
nature.com/articles/s41586-025

They also wrote prose on the Conversation theconversation.com/unpreceden

Low surface wind speed led to shallower-than-normal ocean mixing which enabled heating the surface more.
Less clouds from shipping SO2 were only marginally responsible and only in small pockets.

Okay. But where did the wind go?
Surface wind is impacted by jetstream. And I think, the jetstream got diverted in June and July 2023 to Northern Greenland. Due to low spring snow cover in Eastern Canada which led to dry soil – which in turn gets hotter than wet soil.
And according to
"Summer atmospheric circulation over Greenland in response to Arctic amplification and diminished spring snow cover over Canada" by
Preece et al 2023
nature.com/articles/s41467-023
that hot soil in Eastern Canada leads to a High over Greenland – and a low over the #ColdBlob
East Canada was ablaze in June July 2023 suggesting dry and hence hot soil =perfect conditions for a North Greenland High, diverting the jetstream.

#climatechange#ocean#Atlantic
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