February 27, 2023 — Already one of the fastest-warming bodies of water in the world, the Gulf of Maine recorded its second-hottest year ever in 2022, another ominous indicator of how global warming threatens the rich marine world off New England.
The Gulf of Maine Research Institute reported recently that average annual sea surface temperature for the sprawling ocean waters clocked in at 53.66 degrees Fahrenheit last year, more than 3.72 degrees above a 30-year average measured earlier this century. In 2021, the average annual sea surface temperature was even slightly higher, at 54.09 degrees.
The rapid rise in water temperatures has dire consequences, such as the loss of marine species, some of which are major sources of food and commercial fishing activities, and rising sea levels that can damage coastal communities.
“It’s part of a multidecadal trend that … has profound implications for not just people who rely on the Gulf of Maine for their livelihoods and well-being but also for coastal communities,” said Dave Reidmiller, director of the Climate Center at the Gulf of Maine Research Institute.
Home to more than 3,000 aquatic species and birds, the gulf is “one of the most biologically productive marine ecosystems” in the North Atlantic, according to the Gulf of Maine Association. It covers a 36,000-square-mile area from the tip of Cape Cod to Cape Sable in Nova Scotia, and its historically cold waters are a key reason why the gulf is such a viable environment for marine life.
The temperature of the gulf has been rising rapidly for more than a century, at a rate more than three times that of the world’s oceans, according to the institute’s report released last week. It surpassed the average temperature of the global oceans in the 1990s.
Rising gulf temperatures are also, in large part, why New England itself is warming faster than the planetary average, scientists say.