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Ice coverage in Gulf of St. Lawrence at historic low for midwinter


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A little more than one per cent of the Gulf of St. Lawrence is covered in ice this week, when in a normal year almost a third would be iced in, according to a release from Environment Canada.

That is a record low amount of Eastern Canadian sea ice by a wide margin, almost five per cent less ice than in 2006, the previous record year for the second week of February.

“Despite the recent stretch of cold weather, this winter has been very warm so far and the lack of sea ice in the Gulf of St. Lawrence is concerning,” said CBC meteorologist Jay Scotland.

The lack of ice has negative implications for Maritime fisheries and for vulnerable shorelines along Prince Edward Island, New Brunswick and Quebec’s Magdalen Islands.

When ice covers the Northumberland Strait, it cools down the water underneath, creating conditions that don’t allow the temperature to rise as quickly or as high when summer come.

Warmer waters in ice-free years will lead to less growth in scallop beds.

As for the shoreline, ice cover can act as a barrier against waves during winter storms. With no ice protection, the waves from those storms crash right onto the beach and dunes.

The wave action can damage fragile dunes like those on P.E.I., leading to shoreline erosion.

In this picture, taken Wednesday, a slurry of ice gathers in the centre of Charlottetown Harbour where the flow of the three rivers going into the harbour meets. Typically, the harbour would freeze over around New Year’s. (Kevin Yarr/CBC)

Garrett Mombourquette, a climate change specialist with Parks Canada, said Parks Canada has been watching the formation of ice at four sites in P.E.I. National Park since 2014, and they have noticed a change.

“The number of days where ice has been present along the North Shore adjacent to Prince Edward Island National Park has been on a downward trend,” said Mombourquette.

“A reduction in nearshore ice will likely increase the amount of coastal erosion that occurs in the winter.”

This chart shows week-by-week ice cover in the Gulf of St. Lawrence. The green line represents average coverage. (Environment Canada)

It is too early to say how much of an impact this particular consequence of climate change will have, he said.

While the weather has been cold recently, December and January were exceptionally mild, both with temperatures 4 C above average.

Ocean ice (at bottom) forms around the shore near Mount Carmel in western P.E.I. on Friday. Thicker layers of ice can protect fragile cliffs and dunes from destruction by winter storm waves and storm surge. (Shane Hennessey/CBC)

Prince Edward Island did see a recent cold snap beginning Tuesday, with temperatures running three to four degrees below normal.

They were up again Friday, and are forecast to be up and down within a few degrees of normal for the next week.

More from CBC P.E.I.

www.cbc.ca 2021-02-12 19:00:00

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