**Polar experiments reveal seasonal cycle in Antarctic sea ice algae**

In the frigid waters surrounding Antarctica, an unusual seasonal cycle occurs. During winter, from March to October, the sun barely rises. As seawater freezes it rejects salts, creating pockets of extra-salty brine where microbes live in winter. In summer, the sea ice melts under constant daylight, producing warmer, fresher water at the surface.

https://phys.org/news/2023-09-polar-reveal-seasonal-antarctic-sea.html