At https://phys.org/news/2019-08-jet-stream-aircraft-turbulence-climate.html … climate change is according to a new study having an impact on the jet stream. Mind you, our August weather patterns seem to confirm this as it is wet in the UK and Ireland at the moment (and across a band of northern Europe). However, in the study in Nature (Aug 2019) the jet stream is said to be 15 per cent more skewed. In other words, it is further south than it was in the 1990s nd 2000s. Wind sheer creates turbulence, we are told, and human induced climate change will cause turbulence up to 3 times more commonly by 2050-80 (always a long time in the future). This means aeroplane passengers will get a bumpier ride. The study authors do not appear to have taken into consideration that politicos in Europe and other parts of the world say they are going to phase out fossil fuel use by 2050 which means there will be no aeroplanes in the sky to get bumpy about. Mind you, if the study authors had done any proper research, such as visiting the university library, they might have found the likes of HH Lamb described what is happening in very clear detail 50 years ago. Jet stream movements have been going on since the year dot and even ship logs record precipitation and storms – and there is an archive of naval documents to that effect. However, reality gets away from the true motive of these kind of studies. It is designed to keep the alarmism of climate change at full throttle. Hot air and not a lot else.
Like minds can be found at https://blog.drwile.com/more-global-warming-nonsense/ … where the blog author starts by saying the public doesn't take climate change seriously because the media report on it stupidly. Any bad thing, or what is considered to be a bad thing such as a few days of hot weather, is down to climate change. When the opposite happens it is ignored (there is no mention of climate change or climate change is blamed for hot and for cold). He provides an example. In the year 2000 the Great Lakes began to recede at the shore line and New Scientist ran a story on global warming shrinking the Great Lakes. This is what we might expect if global warming was accurate as higher temperatures would increase evaporative rates – and lake levels would drop. However, currently the Great Lakes are at high levels. What might be causing this? Climate change is being invoked once again. So, we have global warming causing a shrinkage, and a filling up of the lakes, and also of draining it. Apparently, we are told, climate change has disrupted the balance between evaporative rates and precipitation levels. Dr Wile then says, when you go and have a look at the data the fluctuations are seen to vary over the past 100 years. Nothing out of the ordinary has happened. In fact, there is a much longer record of lake level changes in the central Asian Caspian and Aral seas, going back to the Greeks and Romans (who left accounts of expansion and contraction of these inland seas). They varied in size over the centuries as the storm track moved – bringing us back to the jet stream once again. When the latter was further south across central Asia the Caspian filled up and expanded. All that water falling out of the sky had to go somewhere and all the rivers make their way into these inland seas (including the Black Sea). When the jet stream was further north, as it is during warmer global climate conditions, the Caspian shrank (as it did in the 1990s). The changes in lake level at the Great Lakes that are going on at the moment are very minor in comparison to the big changes that occur over greater periods of time – such as the Roman Warm Period and the post-Roman cooling. They are minor oscillations in the jet stream – but obviously if the weather gets cooler and then storms across northern Europe will become more common (as in the Little Ice Age of the 16th and 17th centuries). Warm periods are consistent with greater agricultural yields and a higher human populations. We are living in a warm period. Enjoy.