A baseline for the vertical distribution of the stable carbon isotopes of dissolved inorganic carbon (δ13CDIC) in the Arctic Ocean
A baseline for the vertical distribution of the stable carbon isotopes of dissolved inorganic carbon (δ13CDIC) in the Arctic Ocean
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北冰洋溶解无机碳稳定碳同位素 (Ύ´13CDIC) 垂直分布的基线
DOI：
10.1007/s41063-015-0001-0
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Polyak
中科院分区：
文献类型：
--
作者：
Polyak
海洋中溶解的无机碳的稳定碳同位素(δ13CDIC)由于受到生物过程和海-气交换的复杂相互作用的影响，通常没有得到很好的了解。在北冰洋，随着气候条件的快速变化，δ13CDIC值在不久的将来容易发生变化。这项研究为评估北冰洋δ13CDIC提供了基线，重点放在上层至中层水域(至~500m)。在北冰洋测得的δ13CDIC值在~−0.6到+2.2‰之间。在欧亚海盆，δ13CDIC值介于~1~1.5cdIC值之间，上层变化不大。在加拿大海盆，δ13CDIC值在表层达到2‰，最低值为~−0.6‰，发现在~200m水深。在更深的地方，两个盆地内的δ13CDIC值在~1到1.5万亿‰之间。在加拿大盆地，营养水平高于欧亚盆地，δ13CDIC的相关变化显然与生物过程有关。然而，加拿大海盆的低δ13CDIC值也受到非平衡海气交换过程的强烈影响。加拿大盆地和欧亚盆地之间不同的δ13CDIC模式似乎与北冰洋盐跃层内输送过程的差异有关。加拿大盆地的上层有来自拉普特夫、东西伯利亚和楚科奇陆架的水的直接贡献，这些陆架含有较高比例的河流水和与海冰有关的卤水，而欧亚盆地的对应水系主要由来自巴伦支海和喀拉海的盐跃层水形成。平均而言，河流水域的δ13CDICof~−8和‰较低，但在北极盆地，这一信号大多消失，δ13CDIC值与水团中包含的河流水组分只有微弱的相关性。δ13CDIC与海冰卤水贡献无明显关系。
Stable carbon isotopes of dissolved inorganic carbon (δ13CDIC) in the ocean are generally not well understood as they are governed by a complex interplay of biological processes and air–sea exchange. In the Arctic Ocean, δ13CDICvalues are prone to change in the near future with rapidly changing climate conditions. This study provides a baseline to assess the δ13CDICof the Arctic Ocean with a focus on upper to intermediate waters (to ~500 m). Measured δ13CDICvalues in the Arctic Ocean range from ~−0.6 to +2.2 ‰. In the Eurasian Basin, the δ13CDICvalues lie between ~1 and 1.5 ‰ and exhibit little variation within the upper layers. In the Canada Basin, δ13CDICvalues reach 2 ‰ in the surface layer, with lowest values of ~−0.6 ‰ found at ~200 m water depth. At greater depth, δ13CDICvalues range from ~1 to 1.5 ‰ within both basins. In the Canada Basin, nutrient levels are higher than in the Eurasian Basin and associated variations in δ13CDICare clearly related to biological processes. However, low δ13CDICvalues in the Canada Basin are also strongly influenced by non-equilibrium air–sea exchange processes. The different δ13CDICpatterns between the Canada Basin and the Eurasian Basin appear to be linked to differences in transport processes within the Arctic Ocean halocline. The upper layers in the Canada basins have direct contributions of waters from the Laptev, East Siberian and Chukchi shelves, which contain elevated fractions of river waters and sea-ice related brines, whereas their counterparts, in the Eurasian Basin, are mostly formed by halocline waters from the Barents and Kara seas. River waters have low δ13CDICof ~−8 ‰ on average, but in the Arctic basins this signal is mostly lost and δ13CDICvalues show only a weak correlation to river water fractions contained in the water mass. No relation between δ13CDICand sea-ice related brine contribution is apparent.
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DOI：
--
发表时间：
1992
期刊：
影响因子：
--
作者：
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DOI：
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作者：
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