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.

Get local stories you won't find anywhere else right to your inbox.
Sign up here

Comments are closed

Just Posted

Missing Maple Ridge man’s car found in Harrison

Michael Denham has been missing since June 27

UFV grads of 2020 honoured in innovative ways

No convocation ceremony due to pandemic, but grads receive ‘celebration box’

Mission virtual Canada Day celebration available online

Mayor pleasedwith how video turned out

Abbotsford Flea Market reopening on Sunday

Market has been closed since March 8 due to the COVID-19 pandemic

Peak on the lower Fraser River expected to arrive Monday

Peak predicted for July 6, with flows decreasing from there: River Forecast Centre

Police issue warning after baby comes across suspected drugs in Kamloops park

The 11-month-old girl’s mother posted photos on social media showing a small plastic bag containing a purple substance

Collision results in train derailment just east of Golden

The derailment occurred Sunday night, according to a statement from CP

B.C. records 31 new cases, six deaths over three days due to COVID-19

There are 166 active cases in B.C., 16 people in hospital

B.C. highway widening job reduced, costs still up $61 million

Union-only project scales back work to widen Trans-Canada

Greater Victoria nanny pleads guilty to child porn, sexual interference charges

Johnathon Lee Robichaud pleaded guilty to slew of sex crimes

Victoria man dies after skydiving incident on Vancouver Island

34-year-old had made more than 1,000 jumps

Most Read