Antarctica melts under its hottest days on record
On February 6, 2020, weather stations recorded the hottest temperature on record for Antarctica. Thermometers at the Esperanza Base on the northern tip of the Antarctic Peninsula reached 18.3°C (64.9°F) – around the same temperature as Los Angeles that day. The warm spell caused widespread melting on nearby glaciers.
The warm temperatures arrived on February 5 and continued until February 13, 2020.
Mauri Pelto, a glaciologist at Nichols College, observed that during the warming event, around .9 square miles (1.5 square km) of snowpack became saturated with meltwater (shown in blue above). According to climate models, Eagle Island experienced peak melt – 1 inch (30 millimeters) – on February 6. In total, snowpack on Eagle Island melted 4 inches (106 millimeters) from February 6-February 11. About 20 percent of seasonal snow accumulation in the region melted in this one event on Eagle Island.
I haven’t seen melt ponds develop this quickly in Antarctica. You see these kinds of melt events in Alaska and Greenland, but not usually in Antarctica.
He also used satellite images to detect widespread surface melting nearby on Boydell Glacier.
Pelto noted that such rapid melting is caused by sustained high temperatures significantly above freezing. Such persistent warmth was not typical in Antarctica until the 21st century, but it has become more common in recent years.
The warm temperatures of February 2020 were caused by a combination of meteorological elements. A ridge of high pressure was centered over Cape Horn at the beginning of the month, and it allowed warm temperatures to build. Typically, the peninsula is shielded from warm air masses by the Southern Hemisphere westerlies, a band of strong winds that circle the continent. However, the westerlies were in a weakened state, which allowed the extra-tropical warm air to cross the Southern Ocean and reach the ice sheet. Sea surface temperatures in the area were also higher than average by about 2-3°C (about 3.5-5.5 F).
Dry, warm foehn winds also could have played a part. Foehn winds are strong, gusty winds that cause downslope windstorms on mountains, often bringing warm air with them. In February 2020, westerly winds ran into the Antarctic Peninsula Cordillera. As such winds travel up the mountains, the air typically cools and condenses to form rain or snow clouds. As that water vapor condenses into liquid water or ice, heat is released into the surrounding air. This warm, dry air travels downslope on the other side of the mountains, bringing blasts of heat to parts of the peninsula. The drier air means fewer low-lying clouds and potentially more direct sunlight east of the mountain range.
Rajashree Tri Datta, an atmospheric researcher at NASA’s Goddard Space Flight Center, said:
Two things that can make a foehn-induced melt event stronger are stronger winds and higher temperatures.
With warmer air in the surrounding atmosphere and ocean, the conditions were conducive this month for a foehn wind event.
This February heatwave was the third major melt event of the 2019-2020 summer, following warm spells in November 2019 and January 2020. Pelto said:
If you think about this one event in February, it isn’t that significant. It’s more significant that these events are coming more frequently.
Bottom line: In February 2020, weather stations recorded the hottest temperatures on record for Antarctica. The warm spell caused widespread melting on nearby glaciers.