Neodymium isotopes as a new tool for quantifying exchange fluxes at the continent-ocean interface
Neodymium isotopes as a new tool for quantifying exchange fluxes at the continent-ocean interface
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DOI：
10.1016/j.epsl.2005.01.004
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发表时间：
2005-04-15
影响因子：
5.3
通讯作者：
Jeandel, C
中科院分区：
文献类型：
--
作者：
Lacan, F;Jeandel, C
通过河流沉积物的排放，大陆边缘是许多元素进入海洋的主要来源。对于几种活性元素，它们也是优先从水柱中清除的地点，这是由于加强了清除[1][M.P.培根，海洋中化学清除的示踪物：边界效应和大规模化学分馏，Philos]。翻译过来的。R.Soc.，A 325(1988)147-160。]。因此，它们可以理解为海洋、下沉或两者兼而有之的元素来源。尽管物质交换被怀疑发生在大陆/海洋界面[21][P.H.Santschi，L.Guo，I.D.Walsh，M.S.Quigley，M.Baskaran，边界交换和中大西洋海湾大陆边缘水域放射性核素的清除：对有机碳通量的影响，续。搁置决议19(1999)609-636。]尽管它们对海洋化学可能很重要，但封闭的预算仍有待确定。这里，基于过去6年获得的钕同位素组成数据，我们记录并量化了在海洋边界的重要的钕交换，这些区域涵盖了水文、生物和地球化学特征的大光谱：东印度洋、西赤道太平洋、西热带太平洋和西北大西洋，其中钕的去除通量分别占钕输入通量的74+/-23%、100+/-38%、62+/-54%和84+/-45%。对边界交换及其潜在全球化的认识对于(1)我们了解边缘/海洋相互作用及其对海洋同位素化学的影响，以及(2)海洋边缘活性元素(包括污染物)的地球化学循环具有重要意义。(C)2005 Elsevier B.V.保留所有权利。
Continental margins are, via river sediment discharges, the major source of a number of elements to the ocean. They are also, for several reactive elements, sites of preferential removal from the water column, due to enhanced scavenging [1] [M.P. Bacon, Tracers of chemical scavenging in the ocean: Boundary effects and large-scale chemical fractionation, Philos. Trans. R. Soc. Lond., A 325 (1988) 147-160.]. They can therefore be understood as sources of elements for the ocean, sinks or both. Although exchanges of matter are suspected to occur at the continent/ocean interface [21 [P.H. Santschi, L. Guo, I.D. Walsh, M.S. Quigley, M. Baskaran, Boundary exchange and scavenging of radionuclides in continental margin waters of the Middle Atlantic Bight: implications for organic carbon fluxes, Cont. Shelf Res. 19 (1999) 609-636.] and despite their probable importance for the ocean chemistry, closed budgets have still yet to be determined. Here, based on neodymium isotopic composition data obtained during the past 6 yr, we document and quantify significant neodymiurn exchange at ocean boundaries, in areas covering a large spectra of hydrographical, biological and geochemical characteristics : Eastern Indian Ocean, Western Equatorial Pacific, Western Tropical Pacific and Northwestern Atlantic, with neodymium removal fluxes accounting for 74 +/- 23%, 100 +/- 38%, 62 +/- 54% and 84 +/- 45% of the neodymium input fluxes, respectively. Recognition of boundary exchange and its potential globalization have important implications for (1) our understanding of margin/ocean interactions and their influence on the oceanic isotopic chemistry, and (2) geochemical cycling of reactive elements (including pollutants) at ocean margins. (c) 2005 Elsevier B.V. All rights reserved.