New indicator tracks and visualizes ocean acidification in Washington

The Washington State Department of Ecology has launched a new ocean acidification indicator to track and visualize the effects of carbon pollution on marine waters. This initiative is especially important for the local shellfish industry, which is essential for nutrition and local economies. Ocean acidification poses significant threats to shellfish and salmon, disrupting marine ecosystems and food webs. The monitoring program, started in 2019, collects monthly water condition data from 28 locations in Puget Sound, assessing changes in acidity and other critical metrics. A key measurement is the aragonite saturation state, which affects marine organisms' ability to form shells.

Utilizing over four years of data, the indicator shows the number of favorable days for marine life growth, highlighting critical periods for shellfish and young salmon. Research indicates that favorable conditions have decreased since the early 1800s, underscoring the need to address carbon emissions. By sharing findings with tribes, policymakers, and shellfish farmers, the Department of Ecology aims to promote better management practices to mitigate ocean acidification.