Four Decades of Trends and Drivers of Global Surface Ocean Acidification
Four Decades of Trends and Drivers of Global Surface Ocean Acidification
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全球表层海洋酸化的四个十年趋势和驱动因素
DOI：
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发表时间：
2023
影响因子：
5.2
通讯作者：
N. Gruber
中科院分区：
文献类型：
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作者：
Danling Ma;L. Gregor;N. Gruber
海洋正在酸化，这是对海洋从大气中吸收人为二氧化碳(二氧化碳)的反应，但迄今为止，通过观察发现，这种酸化在全球范围内的进展情况很少。在这里，我们填补了这一空白，并使用基于现场和卫星观测的产品Ocean SODA-ETHZ的更新版来确定过去40年(1982年至2021年)表层海洋文石饱和态(ΩAr)和pH=-log([H+])(总尺度)的趋势和驱动因素。在全球平均值中，ΩAr和pH分别以−0.071±0.006十年−1和−0.0166±0.0010十年−1的速率下降，趋势误差主要反映了重建的pH和ΩAr场的不确定性。这些全球平均趋势主要是由表层海洋溶解无机碳(DIC)浓度的增加所驱动的，以响应人为二氧化碳的吸收，但受到自然DIC变化的影响。地表变暖加剧了pH值的下降，占全球趋势的∼的15%。不同地区的长期趋势有很大不同，pH和ΩAr之间也有明显的差异。PH的变化趋势在高纬度地区最高，而ΩAr在低纬度地区下降最快。这些区域差异主要是表层海洋吸收和缓冲人为二氧化碳的能力存在区域差异的结果。大量厄尔尼诺驱动的年际变化叠加在这些趋势上，ΩAr显示出比pH更大的变化，导致ΩAr出现的时间大大延长。
The oceans are acidifying in response to the oceanic uptake of anthropogenic carbon dioxide (CO2) from the atmosphere, yet the global‐scale progression of this acidification has been poorly documented so far by observations. Here, we fill this gap and use an updated version of the in situ and satellite observation‐based product OceanSODA‐ETHZ to determine the trends and drivers of the surface ocean aragonite saturation state (Ωar) and pH = –log([H+]) (total scale) over the last four decades (1982–2021). In the global mean, Ωar and pH declined at rates of −0.071 ± 0.006 decade−1 and −0.0166 ± 0.0010 decade−1, respectively, with the errors of the trends largely reflecting the uncertainties in the reconstructed pH and Ωar fields. These global mean trends are driven primarily by the increase in surface ocean concentration of dissolved inorganic carbon (DIC) in response to the uptake of anthropogenic CO2, but moderated by changes in natural DIC. Surface warming enhances the decrease in pH, accounting for ∼15% of the global trend. The long‐term trends vary substantially across regions and also differ distinctly between pH and Ωar. The highest trends in pH are found in the high latitudes, while Ωar decreases the fastest in the low latitudes. These regional differences are primarily a consequence of regional differences in the ability of the surface ocean to take up and buffer the anthropogenic CO2. Substantial El Niño‐driven interannual variability is superimposed on these trends, with Ωar showing greater variability than pH, resulting in substantially longer time of emergence for Ωar.
影响因子：
4.9
作者：
Carton, James A.;Chepurin, Gennady A.;Chen, Ligang
通讯作者：
Chen, Ligang