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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Dispersion of a tracer in the deep Gulf of Mexico
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Dispersion of a tracer in the deep Gulf of Mexico

机译：示踪剂在墨西哥湾深处的扩散

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摘要

A 25 km streak of CF_3SF_5 was released on an isopycnal surface approximately 1100 m deep, and 150 m above the bottom, along the continental slope of the northern Gulf of Mexico, to study stirring and mixing of a passive tracer. The location and depth of the release were near those of the deep hydrocarbon plume resulting from the 2010 Deepwater Horizon oil well rupture. The tracer was sampled between 5 and 12 days after release, and again 4 and 12 months after release. The tracer moved along the slope at first but gradually moved into the interior of the Gulf. Diapycnal spreading of the patch during the first 4 months was much faster than it was between 4 and 12 months, indicating that mixing was greatly enhanced over the slope. The rate of lateral homogenization of the tracer was much greater than observed in similar experiments in the open ocean, again possibly enhanced near the slope. Maximum concentrations found in the surveys had fallen by factors of 10~4, 10~7, and 10~8, at 1 week, 4 months, and 12 months, respectively, compared with those estimated for the initial tracer streak. A regional ocean model was used to simulate the tracer field and help interpret its dispersion and temporal evolution. Model-data comparisons show that the model simulation was able to replicate statistics of the observed tracer distribution that would be important in assessing the impact of oil releases in the middepth Gulf.
机译：CF_3SF_5的25 km条纹沿着墨西哥湾北部的陆坡在大约1100 m深，底部上方150 m的等深表面上释放，以研究被动示踪剂的搅拌和混合。释放的位置和深度接近于2010年“深水地平线”油井破裂导致的深层烃羽流。在释放后的5到12天之间以及释放后的4到12个月内对示踪剂进行采样。示踪剂起初沿斜坡移动，但逐渐移入海湾内部。在最初的4个月中，贴片的对角线传播比在4到12个月之间的传播要快得多，这表明在斜坡上的混合大大增强了。示踪剂的横向均质化速率远比在类似海洋中的类似实验中观察到的速率大，在斜坡附近也可能有所提高。与最初的示踪条纹估计值相比，在第1周，4个月和12个月时，调查中发现的最大浓度分别下降了10〜4、10〜7和10〜8倍。使用区域海洋模型来模拟示踪剂场并帮助解释其散布和时间演变。模型数据的比较表明，模型仿真能够复制观察到的示踪剂分布的统计信息，这对于评估海湾中深部石油释放的影响至关重要。

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