New Marine Heatwave has Scientists Concerned as it Threatens Wildlife and Coastal Communities

(CALIFORNIA) A large mass of warmer than average water called a marine heatwave is making its way along the west coast. (Photo: Rick Evans)

The National Oceanic and Atmospheric Administration (NOAA) just recently issued a report that the second largest marine heatwave ever detected is forming in the northern Pacific Ocean. Marine heatwaves are defined as an extended period of higher than average temperatures detected in an area of the ocean. They are specifically identified based on the expected temperatures for the time of year and location in which they appear.

Comparison of the original "blob" marine heatwave and the current conditions. (Source: NOAA)

From roughly 2014 to 2016, the largest marine heatwave ever recorded dramatically affected marine life and weather patterns along the West Coast of the United States. This event was nicknamed The Blob due to its amorphous shape and dark color as it appears in weather satellite imagery.

During this time, the warm surface water temperatures caused an outbreak of toxic algae blooms that resulted in the deaths of many species of fish and birds. The outbreak also caused the closing of shellfish and crab fisheries in California due to contamination concerns.

(CALIFORNIA) Marine mammals like sea lions struggle to find adequate food during marine heatwaves. (Photo: Rick Evans)

The entire marine food web gets disrupted by these heatwaves. The warmer water temperatures affect the lifecycles of sea life from the smallest plankton and krill all the way up to the larger species like seals and whales. A record number of sea lions became stranded and malnourished during the last heatwave.