The distribution of dissolved zinc in the Atlantic sector of the Southern Ocean
The distribution of dissolved zinc in the Atlantic sector of the Southern Ocean
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DOI：
10.1016/j.dsr2.2010.10.041
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发表时间：
2011-12-15
影响因子：
3
通讯作者：
Streu, Peter
中科院分区：
文献类型：
--
作者：
Croot, Peter L.;Baars, Oliver;Streu, Peter
2008年秋季，作为国际海洋研究所零点和德雷克探险队的一部分，对南大洋大西洋海区溶解锌的分布进行了调查。研究的重点是沿零子午线和德雷克海峡的主要锋面系统的横断面。在南极极锋两个断面上观测到的表层锌浓度有很大的梯度，整个南大洋的表层水中锌含量都很高。溶解态锌的垂直剖面显示，在200米的上层存在局部极小值和极大值，这分别与浮游植物的显著摄取和浮游动物的放牧相一致。在与中央中间水(CIW)有关的韦德尔环流(CIW)的中心发现了最高的深水锌浓度，CIW是一种水团，在O-2中枯竭，在二氧化碳中升高，在区域内是CFC值最低的。我们的数据表明，下沉颗粒的再矿化是控制锌在南大洋分布的关键。上层水柱中锌与磷的消失率(锌：磷)沿两个断面向南增加，根据实验室研究，他们认为浮游植物的生长速度较慢是由于铁或光的限制。锌和硅酸盐在整个研究区域内具有很强的相关性，但除零子午线上靠近冰缘的区域外，总体上锌和硅酸盐的消失率相对均匀。(C)2010爱思唯尔有限公司。保留所有权利。
The distribution of dissolved zinc (Zn) was investigated in the Atlantic sector of the Southern Ocean in the austral autumn of 2008 as part of the IPY GEOTRACES expedition ZERO & DRAKE. Research focused on transects across the major frontal systems along the Zero Meridian and across the Drake Passage. There was a strong gradient in surface zinc concentrations observed across the Antarctic Polar Front along both transects and high zinc levels were found in surface waters throughout the Southern Ocean. Vertical profiles for dissolved Zinc showed the presence of local minima and maxima in the upper 200 m consistent with significant uptake by phytoplankton and release by zooplankton grazing, respectively. Highest deep water zinc concentrations were found in the centre of the Weddell Gyre associated with Central Intermediate Water (CIW), a water mass which is depleted in O-2, elevated in CO2 and is regionally a CFC minimum. Our data suggests that the remineralization of sinking particles is a key control on the distribution of Zn in the Southern Ocean. Disappearance ratios of zinc to phosphate (Zn:P) in the upper water column increased southwards along both transects and based on laboratory studies they suggest slower growth rates of phytoplankton due to iron or light limitation. Zinc and silicate were strongly correlated throughout the study region but the disappearance ratio (Zn:Si) was relatively uniform overall except for the region close to the ice edge on the Zero Meridian. (C) 2010 Elsevier Ltd. All rights reserved.