Most of us know what a heat wave feels like on land—sweltering heat for days. But oceans get heat waves too. When water temperature goes over a seasonal threshold for five days or more, that's a marine heat wave. They do their worst damage in summer, when the ocean is already at its warmest, but they can occur any time of year.
In our new research, we looked at the temperature data closely. We found marine heat waves come in a variety of types and have different causes. We also found some types of marine heat wave are more likely during particular seasons.
For instance, winter marine heat waves often run from surface to seafloor. They occur when the powerful, deep and warm East Australian Current snakes westward towards the coast. As the current swings over the continental slope, it dragsIn summer, Australia gets two very different types of heat wave in our oceans. The first occur when we get blue-sky weather. With few clouds, more heat from the sun gets into the oceans.
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