Assess and quantify the impacts that climate variability and change have on the sea ice in the Arctic Ocean versus the Canadian Arctic Archipelago, Nares Strait and the consequences of these impacts for the climate system.

Increased Arctic Ocean sea ice loss through the Canadian Arctic
Archipelago under a warmer climate
Stephen Howell and Mike Brady
Environment and Climate Change Canada, Climate Research Division, Toronto, Canada (stephen.howell@canada.ca)
The ice arches that ring the northern Canadian Arctic Archipelago have historically blocked the
inflow of Arctic Ocean sea ice for the majority of the year. However, annual average air
temperature in northern Canada has increased by more than 2°C over the past 65+ years and a
warmer climate is expected to contribute to the deterioration of these ice arches, which in turn
has implications for the overall loss of Arctic Ocean sea ice. We investigated the effect of warming
on the Arctic Ocean ice area flux into the Canadian Arctic Archipelago using a 22-year record
(1997-2018) of ice exchange derived from RADARSAT-1 and RADARSAT-2 imagery. Results
indicated that there has been a significant increase in the amount of Arctic Ocean sea ice (103
km2
/year) entering the northern Canadian Arctic Archipelago over the period of 1997-2018. The
increased Arctic Ocean ice area flux was associated with reduced ice arch duration but also with
faster (thinner) moving ice and more southern latitude open water leeway as a result of the
Canadian Arctic Archipelago’s long-term transition to a younger and thinner ice regime.
Remarkably, in 2016, the Arctic Ocean ice area flux into the Canadian Arctic Archipelago (161×103
km2
) was 7 times greater than the 1997-2018 average (23×103
km2
) and almost double the 2007 ice
area flux into Nares Strait (87×103
km2
). Indeed, Nares Strait is known to be an important pathway
for Arctic Ocean ice loss however, the results of this study suggest that with continued warming,
the Canadian Arctic Archipelago may also become a large contributor to Arctic Ocean ice loss.

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