Quantifying the impact of riverine particulate dissolution in seawater on ocean chemistry
Quantifying the impact of riverine particulate dissolution in seawater on ocean chemistry
复制标题
量化海水中河流颗粒溶解对海洋化学的影响
DOI：
10.1016/j.epsl.2014.03.039
复制
发表时间：
2014
影响因子：
5.3
通讯作者：
Jones M
中科院分区：
文献类型：
--
作者：
Jones M
元素向海洋的源和汇的量化是我们理解全球地球化学循环和地球表面化学演化的基础。然而，目前对许多元素的全球海洋通量的最佳估计存在很大的不平衡。在锶的情况下，平衡来自河流的输入将需要比在大洋中脊估计的热液水通量大得多的地幔衍生成分。目前对河流通量的估计完全基于对溶解金属浓度的测量，而忽略了河流颗粒在海水中溶解的影响。在这里，我们提供了来自冰岛河口的~(87)Sr/~(86)Sr同位素数据，这些数据表明，从河流颗粒物中迅速释放出锶。我们计算出，这种锶的释放是相应的河流溶解通量的1.1-7.5倍。如果这种行为是全世界火山颗粒的典型行为，这种释放可能会占到感知到的海洋锶预算失衡的6%-45%，在更长的时间尺度上持续释放元素将进一步减少赤字。颗粒物的类似释放将极大地影响许多其他要素的海洋预算，改变我们对沿海生产力以及土壤侵蚀和河流筑坝等人为影响的理解。
The quantification of the sources and sinks of elements to the oceans forms the basis of our understanding of global geochemical cycles and the chemical evolution of the Earth's surface. There is, however, a large imbalance in the current best estimates of the global fluxes to the oceans for many elements. In the case of strontium (Sr), balancing the input from rivers would require a much greater mantle-derived component than is possible from hydrothermal water flux estimates at mid-ocean ridges. Current estimates of riverine fluxes are based entirely on measurements of dissolved metal concentrations, and neglect the impact of riverine particulate dissolution in seawater. Here we present87Sr/86Sr isotope data from an Icelandic estuary, which demonstrate rapid Sr release from the riverine particulates. We calculate that this Sr release is 1.1–7.5 times greater than the corresponding dissolved riverine flux. If such behaviour is typical of volcanic particulates worldwide, this release could account for 6–45% of the perceived marine Sr budget imbalance, with continued element release over longer timescales further reducing the deficit. Similar release from particulate material will greatly affect the marine budgets of many other elements, changing our understanding of coastal productivity, and anthropogenic effects such as soil erosion and the damming of rivers.
过去 400ka 海水 87Sr86Sr 的演化：冰期/间冰期循环的缺失
影响因子：
5.3
作者：
G. Henderson;D. J. Martel;R. O’nions;N. Shackleton
通讯作者：
N. Shackleton