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首页> 外文期刊>Geophysical Research Letters >Insights into particle formation and remineralization using the short-lived radionuclide, Thoruim-234
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Insights into particle formation and remineralization using the short-lived radionuclide, Thoruim-234

机译:使用短寿命放射性核素Thoruim-234洞悉颗粒形成和矿化作用

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摘要

Simple mass balance models are applied to a high resolution ~(234)Th profile from the northwest Pacific to examine the magnitude, rate, and depth distribution of particle remineralization processes below the euphotic zone (E_z). Here, excess ~(234)Th (~(234)Th & ~(238)U) below the E_z is attributed to fragmentation processes that result in the conversion of sinking to non-sinking particles. By considering particulate organic carbon (POC) to ~(234)Th ratios on particles, we show that POC flux attenuation is larger than for ~(234)Th, which we attribute to bacterial and zooplankton consumption of sinking POC. Three case studies are used to demonstrate how different combinations of particle fragmentation and POC respiration impact flux attenuation below the E_z. When sampled with high vertical resolution and precision, ~(234)Th and POC/~(234)Th ratios provide insights into both export from the E_z and the extent to which sinking particle fluxes and associated minerals are attenuated with depth.
机译:将简单的质量平衡模型应用于西北太平洋的高分辨率〜(234)Th剖面,以检查常绿区(E_z)以下颗粒再矿化过程的大小,速率和深度分布。在此,在E_z之下的过量的〜(234)Th(〜(234)Th>〜(238)U)归因于碎裂过程,该碎裂过程导致了下沉颗粒转化为非下沉颗粒。通过考虑颗粒上的颗粒有机碳(POC)与〜(234)Th的比率,我们显示POC通量衰减大于〜(234)Th,这归因于沉没POC的细菌和浮游动物消耗。使用三个案例研究来说明颗粒破碎和POC呼吸的不同组合如何影响E_z以下的通量衰减。当以较高的垂直分辨率和精度进行采样时,〜(234)Th和POC /〜(234)Th比率可洞悉E_z的输出以及下沉的粒子通量和相关矿物随深度衰减的程度。

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