Two decades of Pacific anthropogenic carbon storage and ocean acidification along Global Ocean Ship-based Hydrographic Investigations Program sections P16 and P02: Decadal Pacific C anth Changes by EMLR
Two decades of Pacific anthropogenic carbon storage and ocean acidification along Global Ocean Ship-based Hydrographic Investigations Program sections P16 and P02: Decadal Pacific C anth Changes by EMLR
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全球海洋船基水文调查计划部分 P16 和 P02 沿线二十年的太平洋人为碳储存和海洋酸化：EMLR 的十年太平洋碳变化
DOI：
10.1002/2016gb005485
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发表时间：
2017
影响因子：
5.2
通讯作者：
Swift, J. H.
中科院分区：
文献类型：
--
作者：
Carter, B. R.;Feely, R. A.;Mecking, S.;Cross, J. N.;Macdonald, A. M.;Siedlecki, S. A.;Talley, L. D.;Sabine, C. L.;Millero, F. J.;Swift, J. H.
本文采用改进的扩展多元线性回归（eMLR）方法估算了近20年来太平洋P02和P16水文断面沿着人为碳浓度（Canth）变化。P02是在30°N处横跨北太平洋的纬向断面，P16是在~150°W处横跨南北太平洋的纬向断面。eMLR修改允许与回归参数的选择相关的不确定性得到解决和减少。在这两个十年中，发现Canthis从表面到沿着两条线的~1000 m深度的整个水柱都有所增加。在早期（20世纪90年代-21世纪初）和最近（21世纪初-21世纪10年代）的沿着P02，平均列Canthinventory持续增加，分别为0.53 ± 0.11和0.46 ± 0.11 mol Cm −2a−1。相比之下，沿着P16，Canthstorage从0.29 ± 0.10加速到0.45 ± 0.11 mol C m−2a− 1。水团分布的变化被排除作为这种增加的潜在原因，这是由于最近增加的南太平洋副热带环流的通风。沿P16沿着的年代际变化外推到整个环流，以估计太平洋盆地在60°S和60°N之间的平均储存量，前十年为6.1 ± 1.5 PgC十年-1，最近十年为8.8 ± 2.2 PgC十年-1。尽管由于太平洋的体积很大，太平洋海峡的渗透很浅，但这一储存量估计很大。到2014年，Canthstorage已经将太平洋表层海水的pH值从-0.08变为-0.14，将文石饱和状态从-0.57变为-0.82。
A modified version of the extended multiple linear regression (eMLR) method is used to estimate anthropogenic carbon concentration (Canth) changes along the Pacific P02 and P16 hydrographic sections over the past two decades. P02 is a zonal section crossing the North Pacific at 30°N, and P16 is a meridional section crossing the North and South Pacific at ~150°W. The eMLR modifications allow the uncertainties associated with choices of regression parameters to be both resolved and reduced. Canthis found to have increased throughout the water column from the surface to ~1000 m depth along both lines in both decades. Mean column Canthinventory increased consistently during the earlier (1990s–2000s) and recent (2000s–2010s) decades along P02, at rates of 0.53 ± 0.11 and 0.46 ± 0.11 mol C m−2a−1, respectively. By contrast, Canthstorage accelerated from 0.29 ± 0.10 to 0.45 ± 0.11 mol C m−2a−1along P16. Shifts in water mass distributions are ruled out as a potential cause of this increase, which is instead attributed to recent increases in the ventilation of the South Pacific Subtropical Cell. Decadal changes along P16 are extrapolated across the gyre to estimate a Pacific Basin average storage between 60°S and 60°N of 6.1 ± 1.5 PgC decade−1in the earlier decade and 8.8 ± 2.2 PgC decade−1in the recent decade. This storage estimate is large despite the shallow Pacific Canthpenetration due to the large volume of the Pacific Ocean. By 2014, Canthstorage had changed Pacific surface seawater pH by −0.08 to −0.14 and aragonite saturation state by −0.57 to −0.82.