Changes in the distribution of Al and particulate Fe along A16N in the eastern North Atlantic Ocean between 2003 and 2013: Implications for changes in dust deposition
Changes in the distribution of Al and particulate Fe along A16N in the eastern North Atlantic Ocean between 2003 and 2013: Implications for changes in dust deposition
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DOI：
10.1016/j.marchem.2015.02.009
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发表时间：
2015-12-20
期刊：
影响因子：
3
通讯作者：
Shelley, Rachel U.
中科院分区：
文献类型：
--
作者：
Barrett, Pamela M.;Resing, Joseph A.;Shelley, Rachel U.
2013年夏季，沿着CLIVAR/CO2重复水文计划A16N断面，对北大西洋东部1000米以下海水样本中的颗粒Al、Fe和溶解Al浓度进行了分析，重复了十年前沿A16N断面进行的痕量金属观测。北大西洋赤道和亚热带地区上层海洋痕量金属的分布受到大气气溶胶来源的严重影响。利用赤道北大西洋次表层颗粒Al和Fe以及混合层溶解Al浓度的变化，我们估计2003至2013年间，北大西洋东部表层水域的尘埃沉降量增加了约15%。副热带模式水域中溶解铝浓度的增加表明，西部盆地的尘埃沉积可能也有所增加。我们的观察结果与最近的报告一致，将热带北大西洋海洋表面温度的上升与过去几十年通过降水增加对大气粉尘的清除联系在一起，并强调了准确表示尘埃沉积过程对模拟铁生物地球化学的重要性。(C)2015爱思唯尔B.V.保留所有权利。
Particulate Al and Fe and dissolved Al concentrations were analyzed in seawater samples from the upper 1000 m of the eastern North Atlantic Ocean along the CLIVAR/CO2 Repeat Hydrography Program section A16N in summer 2013, repeating trace metal observations made along the A16N transect a decade earlier. Upper-ocean trace metal distributions in the equatorial and subtropical regions of the North Atlantic are heavily influenced by atmospheric aerosol sources. Using changes in the concentrations of subsurface particulate Al and Fe and mixed-layer dissolved Al in the equatorial North Atlantic, we estimate dust deposition to surface waters in the eastern North Atlantic increased by approximately 15% between 2003 and 2013. Increased concentrations of dissolved Al in subtropical mode waters suggest that dust deposition may have also increased in the western basin. Our observations are consistent with recent reports linking increasing sea surface temperatures in the tropical North Atlantic to increased removal of atmospheric dust via precipitation over the past several decades and highlight the importance of accurate representation of dust deposition processes for modeling Fe biogeochemistry. (C) 2015 Elsevier B.V. All rights reserved.