Distribution of iodide and iodate in the Atlantic sector of the southern ocean during austral summer
Distribution of iodide and iodate in the Atlantic sector of the southern ocean during austral summer
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DOI：
10.1016/j.dsr2.2011.02.002
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发表时间：
2011-12-15
影响因子：
3
通讯作者：
Lochte, K.
中科院分区：
文献类型：
--
作者：
Bluhm, K.;Croot, P. L.;Lochte, K.
在 Polarstern 巡航 ANTXXIV-3 ZERO&DRAKE 期间对南大洋大西洋部分水域中碘的生物地球化学进行了研究。通过铁浓度和浮游植物丰度的梯度，研究了海水中碘（碘酸盐和碘化物）的形态和分布，范围从零子午线沿线的公海区域到威德尔海和德雷克海峡。由于浮游生物群落组成和理化特性的差异，高纬度地区的碘循环与低纬度地区有所不同。从表面到底部，碘酸盐浓度在 400 至 450 nmol L-1 之间。碘化物的表面浓度（17 至超过 60 nmol L-1）比碧萝斜线以下大约高一个数量级。碘化物的峰值几乎总是位于透光带内，并且与海拔 200 m 的亚硝酸盐浓度呈弱正相关。在所有垂直剖面中，明显的地下碘化物最大值出现在 50 至 200 m 深度之间，表明近地表碘化物下降。威德尔海中的碘化物分布显示威德尔海底水 (WSBW) 中的碘化物水平升高，表明氧化动力学缓慢，并且碘化物有可能作为 WSBW 形成的示踪剂。 (C) 2011 Elsevier Ltd. 保留所有权利。
The biogeochemistry of iodine in the waters of the Atlantic sector of the Southern Ocean was investigated during the Polarstern cruise ANTXXIV-3 ZERO&DRAKE. The speciation and distribution of iodine (iodate and iodide) in seawater was examined across gradients of iron concentrations and phytoplankton abundance, ranging from an open ocean region along the Zero Meridian to the Weddell Sea and Drake Passage. Iodine cycling in high latitudes differs from that in low latitudes due to differences in the plankton community composition and the physicochemical characteristics. Iodate concentrations ranged between 400 and 450 nmol L-1 from the surface to the bottom. Surface concentrations of iodide (17 to over 60 nmol L-1) were about an order of magnitude higher than below the pycnocline. The peak values of iodide lay nearly always within the euphotic zone and showed a weak, positive correlation with nitrite concentrations in the upper 200 m. In all vertical profiles a pronounced sub-surface maximum in iodide appears between 50 and 200 m depth indicating an iodide drawdown at the near surface. Iodide distribution in the Weddell Sea showed elevated levels in Weddell Sea Bottom Water (WSBW) indicating slow oxidation kinetics and the potential for iodide as a tracer of WSBW formation. (C) 2011 Elsevier Ltd. All rights reserved.