Ventilation of the abyss in the Atlantic sector of the Southern Ocean.
Ventilation of the abyss in the Atlantic sector of the Southern Ocean.
复制标题
在南大洋的大西洋部分的深渊的通风。
DOI：
10.1038/s41598-021-86043-2
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发表时间：
2021-03-24
影响因子：
4.6
通讯作者：
Arrowsmith C
中科院分区：
文献类型：
--
作者：
Akhoudas CH;Sallée JB;Haumann FA;Meredith MP;Garabato AN;Reverdin G;Jullion L;Aloisi G;Benetti M;Leng MJ;Arrowsmith C
南大洋的大西洋部分是世界上南极底层水的主要生产地，底层水是在海洋表面通风的水团，然后下沉并夹带较老的水团-最终补充深海全球海洋。近几十年来，对该地区南极底层水的通风和翻转速率进行了大量的估算，得出了惊人的广泛结果，基于水输运的计算（8.4-9.7 Sv）比基于示踪剂的估算（3.7-4.9 Sv）产生更大的速率。在这里，我们调和这些相互冲突的观点，通过整合运输和示踪剂为基础的估计在一个共同的分析框架内，其中底层水形成过程明确量化。我们发现，南极底层水密度大于28.36公斤米，是以8.4 ± 0.7西弗的速度向北输出的，其中包括4.5 ± 0.3西弗的通风良好的密集陆架水，和3.9 ± 0.5西弗的老环极深水夹带到级联羽流。大部分（但不是全部）密集陆架水（3.4 ± 0.6 Sv）产生于威德尔海的大陆架。从该地区出口的AABW中只有55%通风良好，因此将热量和碳吸入深海。我们的研究结果统一了传统上对大西洋南极底层水生产的对比观点，并为其在气候模型中的现实代表性定义了一个基线，过程识别目标。
The Atlantic sector of the Southern Ocean is the world’s main production site of Antarctic Bottom Water, a water-mass that is ventilated at the ocean surface before sinking and entraining older water-masses—ultimately replenishing the abyssal global ocean. In recent decades, numerous attempts at estimating the rates of ventilation and overturning of Antarctic Bottom Water in this region have led to a strikingly broad range of results, with water transport-based calculations (8.4–9.7 Sv) yielding larger rates than tracer-based estimates (3.7–4.9 Sv). Here, we reconcile these conflicting views by integrating transport- and tracer-based estimates within a common analytical framework, in which bottom water formation processes are explicitly quantified. We show that the layer of Antarctic Bottom Water denser than 28.36 kg m is exported northward at a rate of 8.4 ± 0.7 Sv, composed of 4.5 ± 0.3 Sv of well-ventilated Dense Shelf Water, and 3.9 ± 0.5 Sv of old Circumpolar Deep Water entrained into cascading plumes. The majority, but not all, of the Dense Shelf Water (3.4 ± 0.6 Sv) is generated on the continental shelves of the Weddell Sea. Only 55% of AABW exported from the region is well ventilated and thus draws down heat and carbon into the deep ocean. Our findings unify traditionally contrasting views of Antarctic Bottom Water production in the Atlantic sector, and define a baseline, process-discerning target for its realistic representation in climate models.
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影响因子：
56.9
作者：
Garabato, ACN;Polzin, KL;Visbeck, M
通讯作者：
Visbeck, M
影响因子：
3.7
作者：
ELLISON, TH;TURNER, JS
通讯作者：
TURNER, JS
影响因子：
3.5
作者：
Darelius, E.;Strand, K. O.;Fer, I.
通讯作者：
Fer, I.
影响因子：
5.2
作者：
Heuze, Celine;Heywood, Karen J.;Ridley, Jeff K.
通讯作者：
Ridley, Jeff K.
影响因子：
3.6
作者：
Gordon, AL;Visbeck, M;Huber, B
通讯作者：
Huber, B