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

Minister hosted accessibility forum on Wednesday night in Penticton

Residents had their say at forum hosted by social development and poverty reduction minister

Penticton’s Dream Café hosting the Kliffs unique music blend

The Canadian, Berlin-based duo of Mark Bérubé and Kristina Koropecki, AKAthe Kliffs,… Continue reading

Person riding motorized scooter hit by vehicle on Penticton’s Main Street

Individual has non-life threatening injuries, personnel say

40th Annual Share-a-Smile Telethon this weekend

The OSNS’s annual fundraiser returns to Cherry Lane Nov. 17 from noon until 5 p.m.

VIDEO: Kelowna brew pub opens new tasting room

Dan Taylor takes a tour of BNA’s renovated tasting room

Seguin lifts surging Stars to 4-2 win over Canucks

Dallas is 6-0-1 in last seven outings

B.C. government working with RCMP to address $10 million in budget cuts

Public Safety Minister Mike Farnworth issues statement following report of RCMP cost-cutting

‘City that protects rapists’: Sexual assault survivor slams Kelowna mayor for defending RCMP

Heather Friesen spent the morning handing out flyers around city hall calling out the mayor

Malakwa woman still in the running for winning American baking show

Janet Letendre is the only Canadian competing on the Holiday Baking Championship

BC Liquor Stores to move fully to paper bags by March

Vancouver Island to be the first to convert to paper bags in November

New Okanagan resident building skills and community

The Respect Works Here November Multicultural Community Champion

Business savy volunteers sought in North Okanagan

Community Futures looking for members to join advisory panel, board and loans committee

SilverStar to open Nordic trails Saturday in North Okanagan

25 km of groomed trails are ready to explore by cross-country skiers

Most Read