Australian news, and some related international items

Some climate models now predict unexpected , unprecedented spike in global temperatures

A few climate models are now predicting an unprecedented and alarming spike in temperatures — perhaps as much as 5 degrees Celsius, Business Insider, CONNOR PERRETT FEB 9, 2020  

  • A handful of climate projections are predicting much higher rise in global temperatures than scientists have seen in the models before.
  • While there’s concern over the number, some scientists hope the latest projections are outliers.
  • A 2-degree rise in temperature could lead sea level to jump, coral reefs to die, and water to become dangerously scarce in some parts of the world. Some models right now predict a 5-degree rise.
Several recent climate models have suggested the Earth’s climate could warm to a far higher temperature than scientists previously predicted, according to a report from Bloomberg.

The startling anomaly first appeared in models from the National Centre for Atmospheric Research (NCAR), which suggested that if Earth’s atmospheric carbon-dioxide concentration doubles (as it’s expected to do by the end of the century), the planet could wind up 5.3 degrees hotter. That’s 33% higher than the group’s previous estimate.

About a fifth of new climate-model results published in the past year have indicated similarly stark global temperature spikes, according to Bloomberg. The UK-based Met Office Hadley Centre predicted a 5.5 degrees of warming, the US Department of Energy calculated a 5.3°-degree jump, French scientists estimated a 4.9-degree increase, and a model from Canadian scientists predicted the largest rise: 5.6 degrees

Scientists hope the models are an “overshot,” Bloomberg reported. It will take scientists a significant amount time – at least months – to figure out how to interpret the results.

The climate models estimate “climate sensitivity,” which tells scientists how much warmer the planet will get as a result of rising CO₂ concentrations. For four decades, the expected temperature rise if CO2 levels double has been about 3 degrees.

These models have a proven track record of accurately forecasting climate change. A recent study from the American Geophysical Union found that climate projections over the past five decades have largely been accurate – actual climate observations aligned with the models’ predictions.

Still, there’s a hope among climate scientists that the new projections are outliers. About a dozen other models are still due to be released, Bloomberg reported, and they could help paint a clearer picture…….

February 11, 2020 - Posted by | General News

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