King Tides

King Tides (also known as perigean spring tides) are extreme high tide events that occur when the sun and moon’s gravitation forces reinforce one another at times of the year when the moon is closest to the earth. They happen twice a year, but they are typically more dramatic during the winter.

While tides are not affected by climate change, the climate and weather do influence coastal sea levels through storm surges, the El Niño southern oscillation and Pacific decadal oscillation cycles and other factors. Storms that occur during high tides can cause coastal flooding and erosion, a risk that will increase with sea level rise.

Global sea levels have risen approximately 20 cm since the industrial revolution. Even with immediate and dramatic reductions in greenhouse gas emissions, sea level rise is expected to accelerate and to potentially continue for centuries. Climate change will affect sea levels on the British Columbia coast.

Tides, Currents and Water Levels

Learn more about tides across Canada on the Fisheries and Oceans Canada website.

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