A Continental Shelf Pump for CO 2 on the Adelie Land Coast, East Antarctica
A Continental Shelf Pump for CO 2 on the Adelie Land Coast, East Antarctica
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南极洲东部阿德利陆地海岸的 CO 2 大陆架泵
DOI：
10.1029/2020jc016302
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Kusahara Kazuya
中科院分区：
文献类型：
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作者：
Arroyo Mar C.;Shadwick Elizabeth H.;Tilbrook Bronte;Rintoul Stephen R.;Kusahara Kazuya
本文对南极东部阿德利陆地沿着默茨和宁尼斯波林亚斯密集陆架水（DSW）中无机碳从大陆架向深海的输运进行了定量研究。为此，2015年和2017年两次夏季水文调查的总溶解无机碳（TCO 2）观测结果与来自海洋-海冰-冰架耦合模型的DSW体积输送估计值配对，以检查Adélie Land DSW中无机碳的命运。运输表明，在冰后期的Mertz Polynya产犊配置中，DSW的净流出量为227 ± 115 Tg C yr− 1。从大陆架区域流出的无机碳最多，是通过北方边界穿过阿德利和默茨湾，另外还有一次从默茨湾向西的输送。DSW中的无机碳主要来自流入的富含TCO 2的改性环极深水;局部过程（生物生产力，CO2的海气交换，以及海冰形成期间盐水的添加）的贡献要小得多。本研究认为，DSW输出作为一个大陆架泵的CO2，是一个通道，从南极大陆架浅层到深海的无机碳螯合，消除CO2从大气交换的时间尺度上的世纪。
We quantify the transport of inorganic carbon from the continental shelf to the deep ocean in Dense Shelf Water (DSW) from the Mertz and Ninnis Polynyas along the Adélie Land coast in East Antarctica. For this purpose, observations of total dissolved inorganic carbon (TCO2) from two summer hydrographic surveys in 2015 and 2017 were paired with DSW volume transport estimates derived from a coupled ocean‐sea ice‐ice shelf model to examine the fate of inorganic carbon in DSW from Adélie Land. Transports indicate a net outflow of 227 ± 115 Tg C yr−1with DSW in the postglacial calving configuration of the Mertz Polynya. The greatest outflow of inorganic carbon from the shelf region was delivered through the northern boundary across the Adélie and Mertz Sills, with an additional transport westward from the Mertz Polynya. Inorganic carbon in DSW is derived primarily from inflowing TCO2‐rich modified Circumpolar Deep Water; local processes (biological productivity, air‐sea exchange of CO2, and the addition of brine during sea ice formation) make much smaller contributions. This study proposes that DSW export serves as a continental shelf pump for CO2and is a pathway to sequester inorganic carbon from the shallow Antarctic continental shelf to the abyssal ocean, removing CO2from atmospheric exchange on the time scale of centuries.