Particulate and dissolved aluminum and titanium in the upper water column of the Atlantic Ocean
Particulate and dissolved aluminum and titanium in the upper water column of the Atlantic Ocean
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DOI：
10.1016/j.dsr.2012.12.002
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发表时间：
2013-03-01
影响因子：
2.4
通讯作者：
Croot, Peter
中科院分区：
文献类型：
--
作者：
Dammshaeuser, Anna;Wagener, Thibaut;Croot, Peter
本文研究了大西洋上部200 m的造岩微量元素Al和Ti的海洋行为。在东部热带北大西洋的东西向样带（2009年12月）和大西洋经向样带（2010年4 - 5月）对溶解态和颗粒态金属的分布进行了评估。颗粒和溶解Al和Ti的地表水浓度反映了先前观测到的大气输入大西洋的模式。在荧光峰值明显的站点观察到地下最小值，这表明生物生产力与溶解和颗粒Al和Ti的去除之间存在联系。这可能包括生物源颗粒表面的吸收机制、吸附和聚集过程，以及大的、快速下沉的生物源颗粒的形成，例如粪便颗粒。在北大西洋热带和亚热带上层水柱（100 m）的停留时间在颗粒相（Al: 3-22天，Ti: 4-37天）中以天到周为单位，在溶解相中Al为0.9-3.8年，Ti为10-31年。在南大西洋这两个阶段停留时间较长，与较低的生物生产力和较低的去除率一致。在上部水柱中，Al主要以溶解形式存在，而Ti主要以颗粒形式存在。颗粒相和溶解相之间的分配系数偏差最大的是地表水，同时与地壳源相比，溶解Al比Ti多。这可能反映了大气矿物颗粒中Al的溶解比Ti的溶解要高。(c) 2012 Elsevier Ltd.版权所有。
This study investigates the oceanic behavior of the lithogenic trace elements Al and Ti in the upper 200 m of the Atlantic Ocean. The distribution of both metals in the dissolved and particulate phases was assessed along an E-W transect in the eastern tropical North Atlantic (December 2009) and along a meridional Atlantic transect (April-May 2010). The surface water concentrations of particulate and dissolved Al and Ti reflected the previously observed pattern of atmospheric inputs into the Atlantic Ocean. Subsurface minima at stations with pronounced fluorescence maxima were observed, suggesting a link between biological productivity and the removal of both dissolved and particulate Al and Ti. This may include uptake mechanisms, adsorption and aggregation processes on biogenic particle surfaces and the formation of large, fast sinking biogenic particles, e.g., fecal pellets. Residence times in the upper water column (100 m) of the tropical and subtropical North Atlantic were estimated to range in the order of days to weeks in the particulate phases (Al: 3-22 days, Ti: 4-37 days) and were 0.9-3.8 years for Al and 10-31 years for Ti in the dissolved phases. Longer residence times in both phases in the South Atlantic are consistent with lower biological productivity and decreased removal rates. In the upper water column, Al was predominantly present in the dissolved form, whereas Ti mostly occurred in the particulate form. Largest deviations in the partition coefficients between the particulate and dissolved phases were found in the surface waters, together with excess dissolved Al over Ti compared to the crustal source. This likely reflects elevated dissolution of Al compared to Ti from atmospheric mineral particles. (c) 2012 Elsevier Ltd. All rights reserved.