Jet stream that brought storm Eunice has been getting faster over last century

Posted: February 23, 2022 by oldbrew in atmosphere, research, Temperature, weather, wind
Tags: ,

Forecaster highlights the jetstream over the UK [image credit: BBC]


Worth noting, even if the somewhat vague conclusion favoured here is that it’s likely to be an effect of global warming (etc.).
– – –
New research from the University of Southampton shows that the winter jet stream over the North Atlantic and Eurasia has increased its average speed by 8% to 132 miles per hour, says Phys.org.

The jet stream, which this week brought storms Dudley, Eunice and Franklin to the UK, has also has moved northwards by up to 330 kilometers.

The findings relate to the 141-year period from 1871–2011.

Jet streams are fast bands of air which flow around the globe at about ten thousand meters above Earth’s surface. They have a significant influence on storm activity and temperature patterns across the northern hemisphere which can impact the weather through strong winds and flooding events.

This is the longest regional study of the northern hemisphere jet stream and the trends observed are potential indicators of climate change.

The new study, published in Climate Dynamics, provides a comparison of the Northern Hemisphere jet stream across oceans and continents and finds that jet stream trends vary on a regional and seasonal basis.

Between 1871 and 2011 the average winter movement in jet stream latitude over the North Atlantic was from 44° to 47° north with a 10 miles per hour increase in speed, but no increases were observed over the North Pacific.

The study was led by Dr. Samantha Hallam, from the Maynooth University in Ireland whilst she was undertaking a Ph.D. at the University of Southampton.

Dr. Hallam said: “Significant increases in winter jet latitude and speed are observed over the North Atlantic and Eurasia. These changes are consistent with the decreasing temperature and increasing pressure gradients observed between the equator and the Arctic over the period, and likely associated with the warming Arctic winters.”

“Over the North Pacific, no increase in jet latitude or speed are observed, however, changes in the North Pacific sea surface temperatures explains over 50% of the variability in jet latitude.”

Full article here.

Comments
  1. oldbrew says:

    iNews: Sting jets that fuelled Storm Eunice set to become more common in the UK
    23/02/2022

    “We do not have a robust estimate of this change in sting jet frequency over the UK, though this is a question we are currently addressing”

    https://vnexplorer.net/sting-jets-that-fuelled-storm-eunice-set-to-become-more-common-in-the-uk-en20225171437.html
    – – –
    So the headline means nothing?

  2. […] Jet stream that brought storm Eunice has been getting faster over last century […]

  3. Gamecock says:

    ‘Between 1871 and 2011 the average winter movement in jet stream latitude over the North Atlantic was from 44° to 47° north with a 10 miles per hour increase in speed, but no increases were observed over the North Pacific.’

    Since the jet stream was discovered in the 1920s by Wasaburo Ooishi, and verified by Wiley Post in 1934, their assertion is hilarious.

    ‘The study was led by Dr. Samantha Hallam, from the Maynooth University in Ireland whilst she was undertaking a Ph.D. at the University of Southampton.’

    Undertaking? So she was graduate student Samantha Hallam, and NOT Dr. Samantha Hallam, and had NOT earned the title Ph.D (sic).

    This cheesy credential inflation is all too common in scientific reporting.

  4. Kip Hansen says:

    This result requires the CREATION of data — where no data can possibly exist. No one was measuring the speed of the jet stream in 1871 — don’t think they even had any idea that there was a jet stream then…..

    So where does the analysis finding an 8% increase in speed come from? Not data, that’s for sure.

  5. Stephen Richards says:

    How the hell do you measure the density, velocity and volume of a fluid that varies over 3000 miles in length and a kilometre in depth and claim an average over 140 years. That’s really clever.

  6. ivan says:

    This is the sort of result that you get when playing with an unverified computer model especially when you are a student and haven’t looked up what information is available, like the fact the jet stream wasn’t discovered until after 1920.

    The fact this student was awarded a PhD for this work just shows how low university degrees have fallen, one could almost say they aren’t worth the paper they are printed on.

  7. Phoenix44 says:

    This work must blend made up data with some but very incomplete and not accurate data with some, incomplete more accurate dara and more comprehensive and more accurate data.

    Any average derived from that is not worth a hoot. It is surely obvious to everyone that that is the case? The claim you can see an 8% change is simply laughable.

  8. watersider says:

    Bear in mind that Maynooth ‘University’ was for over a hundred years a Catholic seminary for training priests. It is comparable to one of those Red Brick ex technical colleges now masquerading as University’s like The university of East Anglia of Climate Gate fame.
    Mind you, with the adoption of the New Global Warming Religion by our Pope, perhaps Maynooth Seminary is doing the right thing.
    BTW as an Irish Catholic I am allowed to be critical for these farcical greenies.

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