Modulation of ocean acidification by decadal climate variability in the Gulf of Alaska
Modulation of ocean acidification by decadal climate variability in the Gulf of Alaska
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DOI：
10.1038/s43247-021-00254-z
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发表时间：
2021-09-15
影响因子：
7.9
通讯作者：
Doney, Scott C.
中科院分区：
文献类型：
--
作者：
Hauri, Claudine;Pages, Remi;Doney, Scott C.
表层海洋从大气中吸收人为二氧化碳正在导致全球海洋酸化，但海洋环流和混合的区域差异可能会抑制或加速表观酸化率。在这里，我们使用 1980 年至 2013 年的区域海洋模型模拟和观测数据来研究海洋波动如何影响阿拉斯加湾表层水的酸化率。我们发现大规模的大气强迫影响了当地的风和上升流强度，进而影响了海洋酸化率。具体而言，在长达十年的时间间隔内，局部风应力旋度的变化降低了副极地环流的海面高度，从而增加了富含硝酸盐和溶解无机碳的水域的上涌，并提高了表观海洋酸化率。我们将这种海面高度变化定义为阿拉斯加湾北部涛动，并认为它可能导致极端酸化事件，对生态系统健康和渔业有害。根据34年的区域海洋生物地球化学后报模型模拟，十年风模式增强了富含碳的水域的上升流，并增加了阿拉斯加湾表观海洋酸化率。
Uptake of anthropogenic carbon dioxide from the atmosphere by the surface ocean is leading to global ocean acidification, but regional variations in ocean circulation and mixing can dampen or accelerate apparent acidification rates. Here we use a regional ocean model simulation for the years 1980 to 2013 and observational data to investigate how ocean fluctuations impact acidification rates in surface waters of the Gulf of Alaska. We find that large-scale atmospheric forcing influenced local winds and upwelling strength, which in turn affected ocean acidification rate. Specifically, variability in local wind stress curl depressed sea surface height in the subpolar gyre over decade-long intervals, which increased upwelling of nitrate- and dissolved inorganic carbon-rich waters and enhanced apparent ocean acidification rates. We define this sea surface height variability as the Northern Gulf of Alaska Oscillation and suggest that it can cause extreme acidification events that are detrimental to ecosystem health and fisheries.Decadal wind patterns enhance upwelling of carbon-rich waters and increase apparent surface ocean acidification rates in the Gulf of Alaska, according to a 34-year regional ocean biogeochemical hindcast model simulation.