Il Nuovo Postiglione - Antarctic Peninsula sees record high June temperatures

Esperanza Base, an Argentine research station located in the north of the peninsula, recorded the unprecedented figure on June 6.

The previous highest temperature on record for that month -- 13.3C -- dates back to 1998. The current heat also significantly exceeds Esperanza's June average of -6.2C.

Such a figure is "very unusual for this time of year," Jose Luis Stella, a climatologist at Argentina's National Meteorological Service, told AFP.

Argentine bases Marambio and San Martin also recorded unequalled temperatures between June 5 and 6.

Marambio recorded 11.8C, surpassing a previous high of 9.2C and its June average of -10.7C.

San Martin meanwhile saw 9.4C compared to its previous 7.8C record and June average of -5.6C.

- 'Confirms a trend' -

The northern Antarctic heatwave is not an isolated event, University of Groningen professor Raul Cordero told AFP.

"It confirms a trend," he said, warning that "these kinds of events will continue to occur with increasing frequency" if global warming is not derailed.

Thomas Caton Harrison, a polar climate scientist at the British Antarctic Survey, believes a combination of factors including climate change resulted in the current heat.

"There is credible evidence that climate change is playing a role, but the effect is complex in this region," he said.

"Because Antarctica sees such big swings in temperature, we have to collect lots of data over many years to build a picture of the underlying climate."

Both specialists agree that regional temperatures have been rising for years and are already showing visible effects.

"A surprising amount of precipitation has been falling as rain rather than snow," Caton Harrison said.

"This has implications for polar ecosystems such as penguin colonies," he said, adding that "it poses a challenge to my colleagues working on Antarctic bases because a lot of liquid rain has been falling and creating runoff and ice."

Esperanza Base has been recording above-zero temperatures daily for three consecutive weeks.

This trend has caused "large areas in the far north of the white continent to remain free of snow," according to Cordero, who called it "an unusual scene in the Antarctic landscape during winter."

G.Palmiero--INP