The acidification of coastal waters is distinguished from the open ocean because of much stronger synergistic effects between anthropogenic forcing and local biogeochemical processes. However, ocean acidification research is still rather limited in polar coastal oceans. Here, we present a 16 year (2002–2018) observational dataset in the Chukchi Sea during the rapid sea-ice melting season to determine the long-term changes in pH and aragonite saturation state (Ω_arag). We found that pH and Ω_arag significantly declined in the water column with average rates of −0.0095 ± 0.0027 years⁻¹ and −0.0333 ± 0.0098 years⁻¹, respectively, and are 4–6 times faster than those solely due to increasing atmospheric CO₂. We attributed the rapid acidification to the increased dissolved inorganic carbon owing to a combination of ice melt-induced increased atmospheric CO₂ invasion and subsurface remineralization induced by a stronger surface biological production as a result of the increased inflow of the nutrient-rich Pacific water.

中文翻译：

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人为强迫和生物碳循环驱动的北极楚科奇海水的快速酸化


沿海水域的酸化与开阔海洋的区别在于，人为强迫和当地生物地球化学过程之间的协同作用要强得多。然而，极地沿海海洋的海洋酸化研究仍然相当有限。在这里，我们展示了海冰快速融化季节楚科奇海的 16 年（2002-2018 年）观测数据集，以确定 pH 值和文石饱和状态 （Ω_arag） 的长期变化。我们发现 pH 值和 Ω_arag 在水柱中显着下降，平均速率分别为 -0.0095 ± 0.0027 年^-1 和 -0.0333 ± 0.0098 年^-1，并且比仅由于大气 CO₂ 增加而快 4-6 倍。我们将快速酸化归因于溶解无机碳的增加，这是由于冰融化引起的大气 CO₂ 入侵增加，以及由于营养丰富的太平洋水流入增加而导致更强的表面生物生产引起的地下再矿化。