Antarctic Heatwave Explained: Timing, Causes, and Implications
In a stark reminder of the escalating climate crisis, Antarctica experienced an unprecedented heatwave earlier this year, with temperatures soaring to unprecedented levels.
The World Meteorological Organization (WMO) Secretary-General, Petteri Taalas, warned that we are the first generation to fully understand climate change and the last generation to be able to do something about it. His words echoed the gravity of the situation as the continent, known for its icy landscapes, saw temperatures rise.
On February 6, the Esperanza research base recorded a temperature of 18.4°C, a record for Antarctica. This was followed by a nearby research station recording a temperature of 20.75°C on February 9, marking the first time Antarctica exceeded 20°C.
The cause of this Antarctic heatwave in 2020 was primarily the accelerated climate change driven by increased greenhouse gases, especially carbon dioxide (CO2), which led to rapid warming and ice melt in the region, as part of a broader trend of rising global temperatures between 2011 and 2020.
The heatwave also coincided with a significant event in January, when researchers recorded what they consider to be the biggest widespread melting of the George VI ice shelf. The exact reason for this widespread melting is unknown, but scientists suspect that the warm temperature may be a factor.
Ocean warming may have played a significant role in the recent ice loss in Antarctica. Over the last few years, ocean warming has caused more than half of Antarctica's total ice loss, especially in the eastern Antarctic Peninsula.
The positive state of the Indian Ocean Dipole (IOD) may have lasted until January, also contributing to the warmer temperature in the Antarctic regions. Additionally, the late Indian monsoon retreat, the most delayed in 60 years, caused the water in the Indian Ocean to be warmer than usual, contributing to the warmer temperature in the Antarctic regions.
The weakened state of the Southern Hemisphere westerlies due to the Antarctic Oscillation is another factor in the transportation of warm weather to the Antarctic Peninsula.
High-temperature trends in the Antarctic Peninsula give a clearer depiction of the continent's climate, essential in observing rising sea levels and global warming conditions.
The warming trend in Antarctica has been further highlighted by the increased flow of ice from the Thwaites Glacier. According to a study, the amount of ice flowing from the Thwaites Glacier has nearly doubled over the last three decades.
Another concerning development is the collapse of ice shelves, such as the one from the Pine Island Glacier, which broke off into smaller pieces between February 2019 and February 2020. A 2018 study reveals that ice shelf collapse from 1992 to 2017 increased the Antarctic Peninsula ice loss rate from 7 to 33 billion tons a year.
The warming trend in Antarctica has far-reaching implications. A paper by the WWF states that a 4°C increase in global temperature would melt nearly all the glaciers on Earth. This would lead to a significant rise in global sea levels, affecting food security, access to clean water, species extinction, and economic productivity, as warned by WMO Deputy Secretary-General Elena Manaenkova.
However, there is hope. Concrete and realistic plans by global leaders paired with transformative climate action would address the current climate crisis, ensuring that future generations can still marvel at the beauty of Antarctica's icy landscapes.
In the face of these challenges, it is crucial to remember Taalas' words: "We are the first generation to fully understand climate change and the last generation to be able to do something about it."
