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Earth

Climate Change Made This Summer's Drought 20 Times More Likely, Study Finds 174

Rising global temperatures caused by the burning of fossil fuels made this summer's brutal droughts across the Northern Hemisphere -- which dried up rivers, sparked unprecedented wildfires and led to widespread crop failure -- 20 times more likely, according to a new study. Yahoo News reports: Climate change is rewriting normal weather patterns in real time, said the study by World Weather Attribution, a consortium of international scientists who examine the link between rising average global temperatures and extreme weather. The droughts that affected North America, Europe and Asia this summer were so extreme that they would normally be considered a 1-in-400-year event, the study found, but due to climate change, the planet can now expect a repeat of those conditions every 20 years. Individual daily temperature records in Europe were repeatedly broken over the summer of 2022, and the extreme heat was blamed for 24,000 deaths on the continent. Higher average temperatures also dramatically increase evaporation rates, drying out soils and vegetation and leading to a heightened wildfire risk, all of which negatively impact farming.

"In Europe, drought conditions led to reduced harvests. This was particularly worrying, as it followed a climate-change-fueled heat wave in South Asia that also destroyed crops, and happened at a time when global food prices were already extremely high due to the war in Ukraine," Friederike Otto, professor of climate science at Grantham Institute in the U.K. and one of the authors of the study, said in a statement. But as the summer of 2022 showed, climate change amplifies seemingly contradictory effects, worsening drought while also dramatically increasing the risks of extreme precipitation events. In addition to drying out soil, increased evaporation rates due to higher temperatures result in higher levels of atmospheric moisture.
"Our analysis shows that last summer's severe drought conditions across large parts of the Northern Hemisphere were fueled by human-induced climate change. The result also gives us an insight on what is looming ahead. With further global warming we can expect stronger and more frequent droughts in the future," Dominik Schumacher, researcher at ETH Zurich and one of the authors of the study, said in a statement.
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Climate Change Made This Summer's Drought 20 Times More Likely, Study Finds

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  • I.e. these are the first small and (relatively speaking) benign effects. It will now get worse for the next 100 years or so, maybe longer.

  • We had above average monsoon
  • by Vegan Cyclist ( 1650427 ) on Thursday October 06, 2022 @11:59PM (#62945777) Homepage

    Here in Victoria, BC, Canada (the 'damp' Pacific NW) we just recorded our 90th day with less than 1mm of rain.

    The previous record was 60 days, then 54, and continues to drop.

    It's unheard of here. 30 days past the previous *record*.

    Previously the driest two month period was 4mm. Now it's less than 1mm with this dry spell.

    One consequence that hasn't gotten much coverage: since the rivers are so dry, salmon can't actually swim upstream.

    This is going to be catastrophic.

    • One consequence that hasn't gotten much coverage: since the rivers are so dry, salmon can't actually swim upstream.

      Because a few fish were overshaddowed by the potential collapse of European inland shipping. Farming, industry, heck even coal power (back in vogue due to the lack of gas) is insanely reliant on river shipping which came within inches of water height of grinding to a complete stop as barges already running around with only 30% of their normal payload were at risk of running aground.

      The world depends on rivers far more than people understand.

    • You aren't talking about the same thing as the study.

      The study found that the ground dries up faster with warmer temperatures, as a result of global warming.

      You are talking about rainfall. The study looked at rainfall, but didn't report anything with high confidence.

      In fairness, the summary does conflate the two.

  • by twosat ( 1414337 ) on Friday October 07, 2022 @12:53AM (#62945815)

    Here in New Zealand we've just had the warmest and wettest Winter on record, it's also been the third year in a row that the record for the warmest Winter has been broken. https://niwa.co.nz/news/nzs-wa... [niwa.co.nz] https://www.rnz.co.nz/news/nat... [rnz.co.nz]

    • So what you're saying is that records are broken all the time. This isn't climate change then, just business as usual.

      [yes I AM being sarcastic, for the love of god, but I realized typing it that this is actually slightly less stupid than some of the things I have read typed in earnest about climate change so I yet again fall victim to Poe's law]

  • by xfade551 ( 2627499 ) on Friday October 07, 2022 @02:32AM (#62945923)
    The Hunga Tunga volcanic eruption earlier this year (that was the massive eruption in the south Pacific with the satellite footage that went viral) pushed so much ocean water into the atmosphere, it increased the total water concentration of the stratosphere, worldwide, by 5%. This is a remarkable increase. Water vapor is a much stronger greenhouse gas than CO2, so this will cause near term global warming for the next few years (until that excess water vapor can cycle out of the stratosphere), at levels well above anthropogenic warming levels.
  • The following is what it would take to be persuasive, and I don't see the case having been made. The default assumption is that every few hundred years at irregular intervals there are extremes of weather in Europe (and elsewhere for that matter). The default assumption must be that this is one of them. We know that such droughts have occurred before by the historical records, including the medieval inscriptions on stones below modern water levels.

    We also know the mechanism. Its that you get at the same

    • They're not trying to persuade you. They're trying to persuade others who are willing to force you to do what they say.

      Your buy in is not necessary.

  • ...everything 20 times more likely.

    It makes floods 20 times more likely.

    It makes droughts 20 times more likely.

    It makes heat waves 20 times more likely.

    It makes cold snaps 20 times more likely.

    It makes peace 20 times more likely.

    It makes war 20 times more likely.

    The only thing that can stop these things is climate stability. Let's get to work.

  • Unfortunately, this issue is so politicized that all "studies" should be ignored. Nothing is going to change the rate at which CO_2 is going into the atmosphere, politicians' promises notwithstanding, so I say let's wait 80 years or so, and see if things really changed as predicted. Meanwhile, I've got other fish to fry.

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