Scientists have discovered a new island off the coast of Greenland, which they say is the world’s northernmost point of land and was revealed by shifting pack ice.

“It was not our intention to discover a new island,” polar explorer and head of the Arctic station research facility in Greenland, Morten Rasch, said of the find last month. “We just went there to collect samples.”

The scientists initially thought they had arrived at Oodaaq, an island discovered by a Danish survey team in 1978. Only later, when checking the exact location, they realised they had visited another island 780 metres to the north-west.

“Everybody was happy that we found what we thought was Oodaaq island,” said Swiss entrepreneur Christiane Leister, creator of the Leister Foundation that financed the expedition.

“It’s a bit like explorers in the past, who thought they’d landed in a certain place but actually found a totally different place.”

The small island, measuring roughly 30 metres (100ft) across and a peak of about 3 metres, consists of seabed mud as well as moraine – soil and rock left behind by moving glaciers. The team said they would recommend it is named “Qeqertaq Avannarleq”, which means “the northernmost island” in Greenlandic.

Several US expeditions in the area have in recent decades searched for the world’s northernmost island. In 2007, Arctic veteran Dennis Schmitt discovered a similar island close by.

The scientists said that although the new island was exposed by shifting pack ice, its appearance now was not a direct consequence of global warming, which has been shrinking Greenland’s ice sheet.

Rene Forsberg, professor and head of geodynamics at Denmark’s National Space Institute, said the area north of Greenland has some of the thickest polar sea ice, though he added it was now 2-3 metres thick in summer, compared with 4 metres when he first visited as part of the expedition that discovered Oodaaq in 1978.

Any hope of extending territorial claims in the Arctic depends on whether it is in fact an island or a bank that may disappear again. An island needs to remain above sea level at high tide.

“It meets the criteria of an island,” Forsberg said. “This is currently the world’s northernmost land.” Although he did warn: “These small island come and go.”