[ACG57-13] Changes in biogeochemical properties of the Canada Basin, Arctic Ocean
Keywords:Arctic Ocean, acidification, Freshwater
Melting of sea ice freshened surface layer by 2008, and then meltwater content has decreased to ~0 after 2012. After 2013, meteoric water content increased and caused second freshening. These freshening has resulted in changes in nutrient availability, biological productivity, and ocean acidification. Stronger stratification due to freshening decreased accessibility for phytoplankton to nutrients in deeper layer. Increased sea ice melt in the mid-2000s has accelerated ocean acidification. With less meltwater content, state of ocean acidification has stabilized after 2007. Recent freshening due to increased meteoric water should have smaller effect on acidification as river runoff has higher alkalinity than sea ice meltwater. Consequences of continued ocean acidification on zooplankton in the Canada Basin will be also presented.