The research, published Tuesday in the journal Nature Communications, shows that from 1925-2016, the frequency of marine heatwaves increased on average by 34 percent and the length of each heatwave increased by 17 percent. In all, the number of marine heatwave days has increased 54 percent per year.
As a press release for the study detailed, a 2011 marine heatwave in Western Australia shifted ecosystems from being dominated by kelp to being dominated by seaweed. That shift remained even after water temperatures returned to normal.
Then in 2012, a marine heatwave in the Gulf of Maine caused an increase in lobsters but resulted in a crash in prices that seriously hurt the industry's profits.
Warm waters in the North Pacific from 2014-2016 led to fishery closures, mass strandings and harmful algal blooms along coastlines. In 2015, the U.S. West Coast's mysterious "blob" of water, up to 4°C warmer than the surrounding Pacific, became tied to unusual weather across the country.
Another intense marine heatwave in 2016 off Tasmania led to disease outbreaks and impacted the region's oyster and salmon industries.
"Our research also found that from 1982 there was a noticeable acceleration of the trend in marine heatwaves," said lead author Dr. Eric Oliver, a researcher at Dalhousie University in Canada.
"While some of us may enjoy the warmer waters when we go swimming, these heatwaves have significant impacts on ecosystems, biodiversity, fisheries, tourism and aquaculture. There are often profound economic consequences that go hand in hand with these events."
The researchers combined satellite data with a century-long range of datasets, taken from ships and various land-based measuring stations, to determine the trend of intensifying marine heatwaves. They eliminated natural warming variables caused by the El Niño Southern Oscillation, the Pacific Decadal Oscillation and the Atlantic Multidecadal Oscillation to come to their conclusion.
"There was a clear relationship between the rise in global average sea-surface temperatures and the increase in marine heatwaves, much the same as we see increases in
extreme heat events related to the increase in global average temperatures," said co-author and University of New South Wales scientist Dr. Lisa Alexander.
"With more than 90 percent of the heat from human-caused global warming going into our oceans, it is likely marine heatwaves will continue to increase. The next key stage for our research is to quantify exactly how much they may change," she said.
"The results of these projections are likely to have significant implications for how our environment and economies adapt to this changing world."
The move comes after regional authorities declared a state of emergency over the weekend after sightings of more than 50 bears in the town of Belushya Guba since December.
This year's letter from Bill and Melinda Gates focused on nine things that surprised them. For the Microsoft-cofounder, one thing he was surprised to learn was the massive amount of new buildings the planet should expect in the coming decades due to urban population growth.
"The number of buildings in the world is going to double by 2060. It's like we're going to build a new New York City every month for the next 40 years," he said.
By Shana Udvardy
After a dearth of action on climate change and a record year of extreme events in 2017, the inclusion of climate change policies within the annual legislation Congress considers to outline its defense spending priorities (the National Defense Authorization Act) for fiscal year 2018 was welcome progress. House and Senate leaders pushed to include language that mandated that the Department of Defense (DoD) incorporate climate change in their facility planning (see more on what this section of the bill does here and here) as well as issue a report on the impacts of climate change on military installations. Unfortunately, what DoD produced fell far short of what was mandated.
Trump is losing his rallying cry to save coal. The Tennessee Valley Authority (TVA) voted on Thursday to retire two coal-fired power plants in the next few years despite a plea from the president to keep one of the plants open.
Earlier this week, the president posted an oddly specific tweet that urged the government-owned utility to save the 49-year-old Paradise 3 plant in Kentucky. It so happens that the facility burns coal supplied by Murray Energy Corporation, whose CEO is Robert Murray, is a major Trump donor.