ocean circulation

Study reveals global algae blooms are growing, and warming waters may be to blame

Study reveals global algae blooms are growing, and warming waters may be to blame

Swirling blooms of turquoise phytoplankton along coasts may be happening more often and getting bigger, according to new research published in Nature, raising concerns about the impacts of climate change on the world's oceans. Using data captured by NASA's Aqua satellite, scientists have tracked coastal phytoplankton blooms over 17 years, between 2003 and 2020.

Arctic Ocean was once a tub of fresh water covered with a half-mile of ice

Arctic Ocean was once a tub of fresh water covered with a half-mile of ice

The Arctic Ocean was once a pool of fresh water capped with an ice shelf half as thick as the Grand Canyon is deep. If that's hard to envision, don't despair. Scientists were surprised at the discovery, published Wednesday (Feb. 3) in the journal Nature, as well. The trick to envisioning this odd arrangement is to think about the relationship between ice sheets and the ocean. When ice sheets melt, they dump water into the ocean, raising the sea level. But when ice sheets grow, as they have during Earth's glacial periods, sea level drops.