麻豆淫院

In the summer of 2023, East Asia, including Japan, experienced record-breaking temperatures and humidity, accompanied by unprecedented marine heat waves in the surrounding seas. Although the simultaneous occurrence of atmospheric and marine heat waves has drawn global attention in recent years, the mechanisms through which the 2023 marine heat waves influenced land-based heat waves and the magnitude of this influence have remained unclear.

To address this issue, researchers at the University of Tsukuba conducted detailed numerical simulations of the 2023 climatic event using a regional atmospheric model. Results, in AGU Advances, revealed that the 2023 marine heat wave increased both temperature and humidity, thereby considerably amplifying the East Asian heat wave.

This amplification occurred in addition to the influence of anomalous large-scale atmospheric circulations. The mechanism through which marine heat waves increased the surface temperatures involved changes in cloud cover and water vapor, which enhanced the solar radiation reaching the ground.

These findings highlight that East Asia's summer climate, rich in clouds and water vapor, facilitates the amplification of atmospheric heat waves by marine heat waves in the surrounding seas. The recent increasing trend of sea surface temperatures has further intensified the impact of marine heat waves on land-based heat extremes.

Understanding how marine heat waves amplify atmospheric heat waves is essential for improving seasonal forecasts in East Asia and preparing for future extreme weather events.