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A study published in the journal Nature Communications not only estimated the frequency of heat waves, but also developed a new heat measurement unit called cumulative heat, he writes. phys.org.
For many years, climate scientists have predicted that one of the clearest signs of climate change is changes in heat waves.
The cumulative heat indicator shows how much additional heat, expressed in degrees Celsius, has accumulated during a heat wave or season.
For example, one of the strongest heat wave seasons in Australia has accumulated 80 degrees of extra heat across the country. In Russia and the Mediterranean, peak heat wave seasons added 200 degrees and more additional heat.
“Not only are more heat waves recorded each year, but they are longer and have been happening for 70 years,” said Sarah Perkins Kirkpatrick, a researcher at the Center for Extreme Climate Change at the Australian Research Council (ARC).
According to the researcher, on average, heat waves accumulate 1-4.5 degrees of heat every ten years, but in the Middle East, South America and some regions of Africa, there is an increase of 10 degrees.
The only unchanged indicator of heat waves is their intensity. In other words, the cumulative estimate of heat waves increases because they become longer and more frequent, not because they get hotter. However, it is observed that the most aggressive heat waves are a barrier in South America and South Australia.
The study revealed that the increase in heat wave duration in some regions is dramatic, he writes. phys.org. The researchers are particularly concerned that the frequency and duration of the heat wave have increased significantly in the past 30-40 years.
For example, 1950-2017. In the Mediterranean, heat waves lasted an average of 2 days in 10 years. However, in the period 1980-2017, the growth is 6.4 days in 10 years.
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“For many years, climate scientists have predicted that one of the clearest signs of climate change is changes in heat waves,” said Perkins Kirkpatrick.
According to the researcher, the rapid changes in the duration and frequency of heat waves recorded in different regions of the world over 70 years are indisputable proof that climate change is not only occurring but is also intensifying.
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