
The correlation between rising levels of CO2 in the atmosphere (red) at Mauna Loa and rising CO2 levels (blue) and falling pH (green) in the nearby ocean at Station Aloha. As CO2 accumulates in the ocean, the water becomes more acidic (the pH declines). (Figure source: modified from Feely et al. 2009
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Oceans, Observations, Carbon Cycle
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