Iceland experiences cool summer despite record global heat

Despite July being reported as the second hottest month on Earth since records began, with July 22 marking the hottest day ever recorded, Iceland has not experienced any heatwaves. Instead, the summer has, in many areas, been rather dreary, largely due to a cold spot stemming from unstable ocean currents.

While many parts of the world are facing intense heat, weather conditions in Iceland have been tumultuous this summer. A significant cold pool, or blue spot, located southwest of Iceland has been influencing local weather, preventing the establishment of heat records on this record-hot day, according to the Icelandic Meteorological Office.

Global warming is an undeniable reality. According to the European Climate Service Copernicus, July 22 was the hottest day on Earth ever recorded, breaking the previous record set the day before. Halldór Björnsson, a meteorologist, explained that for Iceland to enjoy comfortably warm temperatures, there needs to be a transfer of heat to the island, both through the atmosphere and the ocean.

Heat is transported across the ocean in two main ways: through horizontal surface currents like the Gulf Stream and North Atlantic Current, and through vertical systems known as the Atlantic Meridional Overturning Circulation (AMOC). This circulation is crucial as it mixes warm surface water with colder deep-sea water, playing a critical role in the ocean’s heat distribution.

The current cold pool near Iceland results from instability in this system. Halldór stated that while the AMOC could potentially face a tipping point leading to irreversible changes due to climate change, there are presently no signs of approaching such a threshold. He emphasized the need for research into potential impacts should climate conditions worsen.