File - In this Sept. 14, 2017, file photo, salmon circle just below the surface inside a lock where they joined boats heading from salt water Shilshole Bay into fresh water Salmon Bay at the Ballard Locks in Seattle. Federal scientists say they’re monitoring a new ocean heat wave off the West Coast. Researchers with the National Oceanic and Atmospheric Administration said Thursday, Sept. 5, 2019, the expanse of unusually warm water stretches from Alaska to California, and it resembles a similar heatwave that disrupted marine life five years ago. It remains to be seen whether this heat wave will linger or dissipate more quickly than the last one. (AP Photo/Elaine Thompson, File)

Wedge-shaped marine heat wave blankets B.C.’s west coast, concerning scientists

So far, the warm expanse has been held offshore by cold water welling from the ocean depths

The blob is back — but this time, it looks a little more like a wedge.

Scientists are keeping a close eye on a thin blanket of warm water off the West Coast for about three months, saying it resembles a marine heat wave nicknamed “the blob” that disrupted marine life between 2014 and 2016.

“If it is the same, then it’s very concerning for marine mammals that depend on fish, for seabirds that depend on fish, but also for ocean productivity,” said Andrew Trites, the director of the marine mammal research unit at the University of British Columbia.

The heat wave — which resembles a wedge, stretching from the south of Vancouver Island to Baja, Calif., and offshore towards Hawaii — has raised temperatures about three to four degrees Celsius higher than the normal longterm average for those parts of the ocean, according to the National Oceanic and Atmospheric Administration (NOAA).

“You put on a sweater, you take off a coat,” Trites said. ”But for a marine life it’s a big deal. In the ocean it’s a big deal.”

NOAA research scientist Nate Mantua noted that this year’s wedge is at this point less severe than the blob of 2014 to 2016, because it’s only been around for a few months.

Three to five years ago, the warm water penetrated to depths of 200 to 300 metres, while right now it’s mostly between 30 and 50 metres, he said.

“It’s a blanket over the ocean and that means it could go away pretty quickly if the winds start blowing in a normal way,” Mantua said. “That usually happens at this time of the year as we transition into fall.”

So far, the warm expanse has been held offshore by cold water welling from the ocean depths, he said.

“A lot of marine life that we interact with and we see is concentrated closer to shore in the most productive waters of the northeast Pacific,” he said. “Because it’s offshore its mostly affecting those less productive waters.”

But in addition to being able to dissipate the wedge, winds also have the power to make the heat wave worse.

“Winds have a direct impact on the way heat is exchanged,” he said.

And Mantua said California may already be seeing some of the effects from the warmer waters: NOAA’s surveys have recently noted higher concentration of anchovies — and the big predators that feed on them — close to shore waters.

There’s also been indications that some fish stocks have changed their distribution, he added.

ALSO READ: Threats, abuse move from online to real world, McKenna now requires security

Hina Alam, The Canadian Press


Like us on Facebook and follow us on Twitter.

Just Posted

Community of Vavenby weekly news update

Vavenby Elementary School has two teachers this year as the number of students has increased

Teamster Brad Cameron steps back in the arena

Cameron gets win in the Novice Wagon Competition

Back in Time

Historical Perspective

Alt-right crackpot hunting

Editor, The Times:

VIDEO: Liberals make child care pledge, Greens unveil platform on Day 6 of campaign

Green party leader Elizabeth May unveils her party’s platform in Toronto

Canucks sign Brock Boeser to three-year, US$17.6-million deal

Young sniper will be in Vancouver Tuesday

B.C. forest industry looks to a high-technology future

Restructuring similar to Europe 15 years ago, executive says

RCMP conclude investigation into 2017 Elephant Hill wildfire

Files have been turned over to BC Prosecution Service

B.C. wants to be part of global resolution in opioid company bankruptcy claim

Government says settlement must include Canadian claims for devastation created by overdose crisis

B.C. ends ‘birth alerts’ in child welfare cases

‘Social service workers will no longer share information about expectant parents without consent’

U.S. student, killed in Bamfield bus crash, remembered as ‘kind, intelligent, talented’

John Geerdes, 18, was one of two UVic students killed in the crash on Friday night

Free Tesla 3 offered with purchase of Surrey townhome

Century Group’s offer for Viridian development runs through Oct. 31

B.C. communities urged to improve access for disabled people

One in four B.C. residents has disability, most want to work

Most Read