To examine the ocean acidification of coastal water as the result of the oceanic uptake of anthropogenic atmospheric CO₂, we initiated acidification monitoring in the eastern part of the Tsugaru Strait, through which the Tsugaru Warm Current flows eastward from the Sea of Japan to the North Pacific. Annual mean pH and CaCO₃ saturation state during 2012–2019 decreased considerably throughout all depths at rates of 0.0030–0.0051 and 0.017–0.036 years⁻¹, respectively. These rates of decrease are faster than those caused by increasing atmospheric CO₂ and faster than those observed during previous research. These fast rates are attributed to an enhanced increase in dissolved inorganic carbon concurrently with increases in salinity and density caused by elevated mixing of the upper and deeper waters from the Sea of Japan at the western part of the strait. The elevated mixing is attributable to the strengthening of the Tsugaru Warm Current.

中文翻译：

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2012-2019年间，津轻暖流加剧，使津轻海峡的pH值和CaCO3饱和状态迅速降低

为了研究海洋人为吸收大气中的CO ₂引起的沿海水域海洋酸化，我们在津轻海峡东部启动了酸化监测，使津轻暖流从日本海向北流向北太平洋地区。在2012-2019年期间，所有深度的年平均pH和CaCO ₃饱和状态分别以0. 0030-0 . 0051年和0.017-0 . 036年^-1的速率显着下降。这些降低速度快于大气CO ₂升高引起的降低速度并且比以前的研究中观察到的要快。这些快速的速度归因于海峡西部海域日本海的上层和深层水的混合增加，同时增加了溶解性无机碳的增加以及盐度和密度的增加。混合的增加归因于津轻暖流的增强。