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According to sciencealert.com, temperatures in Antarctica vary greatly by season and region, and for many years the South Pole was thought to remain cool despite global warming.
However, scientists from New Zealand, Britain and the United States have analyzed data collected by weather stations for 60 years and, using computer models, have determined what accelerates such warming.
They found that the highest ocean temperatures in the western Pacific reduced atmospheric pressure over the Vedel Sea in the South Atlantic for several decades. This, in turn, increased the flow of hot air just above the South Pole, where temperatures had increased by more than 1.83 degrees Celsius since 1989.
The study authors say the natural warming trend is likely to have been accelerated by anthropogenic greenhouse gas emissions, and may mask the warming effect of carbon pollution on the South Pole.
“While temperatures in West Antarctica and the Antarctic Peninsula were known to increase in the 20th century, the South Pole was cooling,” Kyle Clem, a researcher at Victoria University in Wellington, who led the study, told AFP. – It is suspected that this part of Antarctica … may be heat resistant. We have found that to be the case. “
Data collected by scientists has shown that the temperature at the South Pole, the outermost part of Earth, increases by about 0.6 degrees Celsius every decade, compared to a rise of about 0.2 degrees in the rest of the planet.
The authors of a study published in the journal Nature Climate Change attribute this change to a phenomenon called IPO (Interdecadal Pacific Oscillation). The IPO cycle lasts approximately 15-30 years and alternates between the “positive” stage, when the tropical Pacific is warmer and the northern part colder than average, and the “negative” stage, when the temperature anomaly changes.
The OPI entered a negative phase earlier this century and led to further increases in convection and pressure in the northern areas, resulting in a stronger flow of warmer air just above the South Pole.
Clem said the heat of 1.83 degrees Celsius exceeded 99.99 percent. all warming trends modeled over 30 years.
“While warming has remained within the variability of natural patterns of climate change, it is highly likely that human activities contributed to it,” he said.
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