Pacific Anthropogenic Carbon Between 1991 and 2017
Pacific Anthropogenic Carbon Between 1991 and 2017
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DOI：
10.1029/2018gb006154
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发表时间：
2019-05-01
影响因子：
5.2
通讯作者：
Bullister, J. L.
中科院分区：
文献类型：
--
作者：
Carter, B. R.;Feely, R. A.;Bullister, J. L.
我们根据过去几十年来被占用两到四次的 14 个水文剖面估算了 1991 年至 2017 年间太平洋的人为碳 (C-anth) 积累率，其中大多数剖面最近已作为全球海洋船基水文调查计划的一部分进行了测量。 C-anth 的变化率是使用一种新方法来估计的，该方法将扩展的多元线性回归方法与改进方法相结合，以解决分析不规则时间间隔的部分的多个占用的挑战。太平洋顶部 1,500 米的碳累积率从 1995 年至 2005 年期间每十年 8.8 (+/- 1.1, 1 sigma) Pg 碳增加到 2005 年至 2015 年间每十年 11.7 (+/- 1.1) PgC。对于整个太平洋，累积率十年间增加的大约一半可归因于大气中碳的增加。二氧化碳，而在南太平洋副热带环流中，这一比例接近五分之一。这表明南太平洋的C-花粉积累因环流变化而大幅增加，并意味着2000年至2010年间发生的全球二氧化碳汇重振的一个有意义的部分可能是由海洋对C-花粉的吸收增加和平流进入该环流所驱动。我们的评估表明，沿调查线的碳质积累率重建的准确性受到全套水文数据的准确性的限制，并且持续的重复调查是未来碳循环监测的关键组成部分。
We estimate anthropogenic carbon (C-anth) accumulation rates in the Pacific Ocean between 1991 and 2017 from 14 hydrographic sections that have been occupied two to four times over the past few decades, with most sections having been recently measured as part of the Global Ocean Ship-based Hydrographic Investigations Program. The rate of change of C-anth is estimated using a new method that combines the extended multiple linear regression method with improvements to address the challenges of analyzing multiple occupations of sections spaced irregularly in time. The C-anth accumulation rate over the top 1,500 m of the Pacific increased from 8.8 (+/- 1.1, 1 sigma) Pg of carbon per decade between 1995 and 2005 to 11.7 (+/- 1.1) PgC per decade between 2005 and 2015. For the entire Pacific, about half of this decadal increase in the accumulation rate is attributable to the increase in atmospheric CO2, while in the South Pacific subtropical gyre this fraction is closer to one fifth. This suggests a substantial enhancement of the accumulation of C-anth in the South Pacific by circulation variability and implies that a meaningful portion of the reinvigoration of the global CO2 sink that occurred between similar to 2000 and similar to 2010 could be driven by enhanced ocean C-anth uptake and advection into this gyre. Our assessment suggests that the accuracy of C-anth accumulation rate reconstructions along survey lines is limited by the accuracy of the full suite of hydrographic data and that a continuation of repeated surveys is a critical component of future carbon cycle monitoring.