This Sept. 26, 2019 photo shows coastal waters off Greenwood State Beach where The Nature Conservancy is mapping and monitoring one of Mendocino County’s last remaining bull kelp forests near Elk, Calif. (AP Photo/Terry Chea)

This Sept. 26, 2019 photo shows coastal waters off Greenwood State Beach where The Nature Conservancy is mapping and monitoring one of Mendocino County’s last remaining bull kelp forests near Elk, Calif. (AP Photo/Terry Chea)

Scientists breathe easier as marine heat wave off west coast weakens

Area of exceptionally warm water is substantially smaller now than it was earlier this year

Scientists say a marine heat wave that blanketed a large area of the west coast has weakened, but the potential disruption to ocean life isn’t over yet.

Nate Mantua of the National Oceanic and Atmospheric Administration said the ”good news” is that the area of exceptionally warm water is substantially smaller now than it was earlier this year.

And while the area about 1,500 kilometres offshore between Hawaii and Alaska is still seeing high temperatures by historical standards, it is “simply not nearly as large as it was and it is no longer strong in areas near the west coast,” he said.

Scientists have been watching a marine heat wave that developed around June this year and resembled a phenomenon that was nicknamed ‘The Blob,’ which disrupted ocean life between 2014 and 2016.

The heat wave, which resembles a wedge this time, stretched from south of Vancouver Island to Baja, Calif., and offshore towards Hawaii. It raised temperatures by up to 4 C.

Mantua said “many energetic storms and unusually strong winds from the north off the west coast” have cooled surface waters back to near normal temperatures for much of the region.

“On the other hand, the offshore warming is still in place, and by historical standards, it is still a large marine heat wave,” he said in an email.

The latest climate model forecasts from the National Oceanic and Atmospheric Administration’s Climate Prediction Center suggest that the offshore warming will gradually weaken over the next seven months, but even by spring will still be warmer than normal, Mantua said.

ALSO READ: Students skip school, join climate strikes across B.C.

Prof. Andrew Trites at the University of British Columbia’s Institute for the Oceans and Fisheries said the marine heat wave is caused when there is not enough wind to churn and cool the water.

“This past summer winds were very, very light — not strong enough for ocean to be mixed the way it used to be in the past. As a result the ocean didn’t cool down the way it was supposed to and it’s holding its heat,” he said in a phone interview.

“It’s not that the ocean got warmer, it’s really that the ocean did not get cooler.”

As a result, some species of tropical fish that are usually seen in tropical waters were found off the west coast, he said.

“One of the fish that I saw a lot of this summer was the sunfish and presumably they are here in higher numbers because the water here was unusually warm this summer and they can tolerate warm temperatures,” Trites said.

Mantua said the most obvious impacts included a pattern of unusually low plankton production from July through September from Vancouver Island to northern California.

Warm waters near the coast of northern California, Oregon, and southern Washington brought albacore tuna closer than normal to the coast, and sport fishing was especially good there this summer, he said.

However, ocean salmon fishing in those areas was generally poor, Mantua said.

“All that said, I have not heard of any reported ecosystem impacts in those offshore waters where it remains very warm,” he said.

“I suspect that the extreme warming in the productive part of the open ocean has had some impacts, but there simply isn’t a lot of information coming from those regions aside from satellite observations of ocean colour that tell us some general information about plankton production.”

There is a chance that the marine heat wave might return, Mantua said, although he thinks “the odds for that are low, at least based on the latest climate forecasts.”

Trites said the first time this heat wave occurred about five years ago, it was thought that it would never happen again.

“So this may be an example of climate change and global warming. It is changing the patterns of air circulation and affecting storminess and it’s not going to mix the water the way it used to.”

Hina Alam, The Canadian Press

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

Just Posted

Interior Health has declared the Cariboo Chilcotin a community cluster. (Angie Mindus photo)
Interior Health declares Cariboo Chilcotin region a COVID-19 cluster, 215 cases since Jan. 1

Most cases are related to transmission at social events and gatherings in Williams Lake

Aside from being a retired librarian and member of the Cariboo Chilcotin Partners for Literacy, Lil Mack advocates or literacy with her own little book box out front at her Ninth Avenue North home. (Monica Lamb-Yorski photo - Williams Lake Tribune)
Our Hometown: Advocating for literacy

Lil Mack has been with Cariboo Chilcotin Partners for Literacy since its inception

The City of Williams Lake is awaiting the arrival of seven terrain park features typically found at ski hills to create more winter recreational opportunities in Boitanio Park. (Arena Snowparks Instagram)
City shows cool side with winter, Boitanio rail park

“We’re just waiting for their arrival and a little more snow,” Atkinson said.

Williams Lake First Nation Chief Willie Sellars provides a community COVID-19 update from his home Wednesday, Jan. 20. (Williams Lake First Nation Facebook image)
WLFN chief reports 11 members fully recovered from COVID-19

23 active cases remains, says Chief Willie Sellars

Maj.-Gen. Dany Fortin, vice-president of logistics and operations at the Public Health Agency of Canada, speaks at a news conference on the COVID-19 pandemic in Ottawa, on Friday, Jan. 15, 2021. THE CANADIAN PRESS/Justin Tang
B.C. records 500 new COVID-19 cases Wednesday, 14 deaths

Outbreak at Surrey Pretrial jail, two more in health care

(File Photo)
‘10 to 12 per cent’: Interior Health corrects COVID positivity rates in Fernie area

IH say the rates are not as high as previously claimed by the region’s top doctor

Cannabis bought in British Columbia (Ashley Wadhwani/Black Press Media)
Is it time to start thinking about greener ways to package cannabis?

Packaging suppliers are still figuring eco-friendly and affordable packaging options that fit the mandates of Cannabis Regulations

Francina Mettes and Thomas Schouten with the 200-page document they submitted in December of 2018. (Travis Paterson/News Staff)
Dutch man, 94, facing unwanted trip home can stay in B.C. with wife of 45 years

Immigration offices cuts red tape so couple of 45 years can stay together in Victoria area

Health Minister Adrian Dix looks on as Dr. Bonnie Henry pauses for a moment as she gives her daily media briefing regarding Covid-19 for the province of British Columbia in Victoria, B.C, Monday, December 7, 2020. THE CANADIAN PRESS/Jonathan Hayward
B.C. Premier, health officials to discuss next steps in COVID immunization plan

Nearly 31,000 doses of vaccine the province expected by Jan. 29 could be curtailed due to production issues

Vancouver Canucks’ Travis Hamonic grabs Montreal Canadiens’ Josh Anderson by the face during first period NHL action in Vancouver, Wednesday, Jan. 20, 2021. THE CANADIAN PRESS/Jonathan Hayward
Horvat scores winner as Canucks dump Habs 6-5 in shootout thriller

Vancouver and Montreal clash again Thursday night

A woman writes a message on a memorial mural wall by street artist James “Smokey Devil” Hardy during a memorial to remember victims of illicit drug overdose deaths on International Overdose Awareness Day, in the Downtown Eastside of Vancouver, on Monday, August 31, 2020. THE CANADIAN PRESS/Darryl Dyck
B.C. paramedics respond to record-breaking number of overdose calls in 2020

On the front lines, COVID-19 has not only led to more calls, but increased the complexity

Vernon's Noric House long-term care facility is dealing with an influenza outbreak amid the COVID-19 pandemic. (File photo)
Two more deaths at Vernon care home

Noric House case numbers remain steady, but death toll rises

Most Read