the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Coastal and regional marine heatwaves and cold spells in the northeastern Atlantic
Coline Poppeschi
Sandra Plecha
Guillaume Charria
Ana Russo
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Coastal currents have wide implications for port activities, transport of sediments, and coral reef ecosystems; thus a deeper understanding of their characteristics is needed. We collected data on current velocities for a year using current meters at shallow waters in Singapore. The strength of the currents is primarily affected by tides and winds and generally increases during the monsoon seasons across various frequencies.
The East Siberian Sea has nearly 80% of the subsea permafrost worldwide. The cold layer with a temperature around −1.5 ºC above the sea floor prevents heat transporting from above to melt permafrost and release methane from sediments. However, we observed a warming trend at the seafloor caused by wave-induced vertical mixing in the shelf. The intensified mixing can transport enormous heat downward, leading to warming of more than 3 °C at the bottom, putting the subsea permafrost in high risk.