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Ocean Warming Redefines Japan's Summer
5 Oct
Summary
- Yamase wind's cooling power has diminished due to warming waters.
- A 'temperature cliff' of 2.5 degrees Celsius was found over 5-10 km.
- Global warming is altering ocean-atmosphere interactions off Japan.
Climate researcher Miku Amano has identified a significant shift in the oceanic and atmospheric patterns influencing Japan's summer weather. Historically, the Yamase wind, a cold northeasterly, brought cooler temperatures and threatened crops in the Tohoku region. However, recent years have seen these damaging cool summers largely absent.
Amano's research aboard a JAMSTEC vessel discovered an undersea 'temperature cliff,' where water temperature dropped by 2.5 degrees Celsius over a mere 5 to 10 kilometers. This finding is crucial in understanding how global warming is changing ocean-atmosphere interactions.
The study suggests a specific anticyclone pattern has weakened the southward flow of cold maritime air. Simultaneously, waters off the Sanriku coast have warmed, meaning the Yamase wind, while still present, now carries less of a chill.
Amano's work, published in the Journal of Climate in 2023, posits this is part of a broader climate 'regime shift.' Her research, stemming from childhood experiences with rice cultivation in Tohoku, aims to provide useful data for adapting to a warmer Japan and world.
