By P Gosselin
Alarmist climate research centers like the Potsdam Institute and the unquestioning media have been claiming for years that the Jet Stream is weakening, hence this would lead to greater weather extremes across the northern hemisphere due to blocking. Responsible for this of course is man-made global warming.
Hat-tip: The Klimaschau
But a recent paper by Samantha Hallam et al published in the journal Climate Dynamics looks at the seasonal to decadal variations in Northern Hemisphere jet stream latitude and speed over land for the period 1871–2011. The authors were unable to find any weakening of the sort climate alarmists have been warning about.
Quite to the contrary, the authors in fact found that the winter jet stream over the North Atlantic and Eurasia has increased in average speed by 8% to 132 mph. The authors found the 141-year trends in jet latitude and speed show differences on a regional basis and that jet speed shows significant increases evident in winter (up to 4.7 ms −1 ), spring and autumn over the North Atlantic, Eurasia and North America. Over the North Pacific, no increase was observed.
Source: Figure 9, Climate Dynamics.
Moreover, the Jet Stream was found to have shifted northward by some 330 kilometers. Overall, the paper’s findings contradict the claims of a weakening Jet Stream regularly made by the climate alarmists and their media minions.
Applying climate alarmist science, we’d have to conclude now, due to the strengthening Jet Stream, less weather extremes should be expected. This would be good news of course. But don’t expect the fear-porn media to look at this.
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less extreme weather, more precipitation, more livable area, higher crop yields, more arable area, fewer temperature-related deaths, lower energy costs
welcome to the climate crisis, everyone
This paper is about strength of the jet stream and changes in that during a period that started in 1871. However, this phenomenon was discovered in incrementing stages from the 1920s to WWII, and significant meteorological measurement coverage of this started with the 1937 start (in the US) of the routine weather balloon radiosonde usage we have now.
Meanwhile, the northern polar front jet stream is powered by horizontal temperature gradient in the atmosphere from its level downward through the atmosphere below it. The Arctic has been warming more than the tropics at least since about the beginning of 1979, according even to UAH v6.
Anyone know where the 2022 hurricane season went?
It decided to keep quiet, just like the Arctic sea-ice extent isn’t drawing attention to the fact that it is relatively high for the middle of August (~6.4 Wadhams, when the extent on 11th August in the “record low” year of 2012 was around 5.2 Wadhams).
NB : Link to “supporting evidence”. Griff et al please take note …
Sorry about this – when all you have is a hammer…
Since the early 1920s the North Atlantic has been increasingly polluted with oil and surfactant spills and smoothed, reducing breaking wave amount and preferentially increasing laminar flow. (This is not big leaks, it’s small drops accumulating.) See SeaWifs data – out of date but indicative.
Less friction/turbulence, higher wind speed.
JF
Moreover, the Jet Stream was found to have shifted northward by some 330 kilometers. Overall, the paper’s findings contradict the claims of a weakening Jet Stream regularly made by the climate alarmists and their media minions.
This has caused most warming in Western Europe. Now is this because of global warming or is this causing it? Chicken and egg.
despite all the different studies, there is one overall, non-ignorable fact|;
THE CLIMATE CONSTANTLY CHANGES EVERY YEAR