South Korea braces for record heatwave amid low Arctic ice, high Pacific temperatures

South Korea is facing the prospect of an "unprecedented heatwave" this summer, according to meteorological analyses linking the forecast to record-low Arctic sea ice and elevated North Pacific sea surface temperatures.

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Arctic sea ice has decreased to its lowest level in three years, making the occurrence of heatwaves and tropical nights this summer highly probable.

Lee Myung-in, director of the Meteorological Research Center for Extreme Weather at Ulsan National Institute of Science and Technology (UNIST), stated that Arctic sea ice has reached its lowest level in three years. This reduction is associated with a strengthened Arctic oscillation, a phenomenon that can cause high-pressure systems to become stationary over mid-latitude regions. Such patterns have historically triggered severe heatwaves, as seen in 1994 and 2018.

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The melting of Arctic sea ice is related to the strengthening of the Arctic oscillation.

The high sea surface temperatures in the North Pacific, which have persisted since 2020, are another key indicator. Warmer ocean waters are expected to contribute to "steaming" heat by increasing the inflow of hot, humid air to the Korean Peninsula. Lee noted that sea surface temperatures in tropical oceans are also nearing record highs, coinciding with the development of El Niño.

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When the Arctic oscillation occurs, high-pressure systems stagnate in the mid-latitudes, a phenomenon that caused powerful heatwaves in 1994 and 2018.

These combined factors suggest a high probability of intense heatwaves and tropical nights, nights where temperatures remain above 25 degrees Celsius (77 degrees Fahrenheit), throughout the summer. The forecast serves as an early warning for potential impacts on public health, agriculture, and energy demand.

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Sea surface temperatures in the North Pacific have remained high since 2020, signaling potential for 'steaming' heat due to the inflow of hot, humid air to the Korean Peninsula.