The Ocean's Global 39 Ar Distribution Estimated With an Ocean Circulation Inverse Model
The Ocean's Global 39 Ar Distribution Estimated With an Ocean Circulation Inverse Model
复制标题
用海洋环流反演模型估算海洋的全球 39 Ar 分布
DOI：
10.1029/2019gl082663
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发表时间：
2019
影响因子：
5.2
通讯作者：
Smethie, Jr., William
中科院分区：
文献类型：
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作者：
Holzer, Mark;DeVries, Timothy;Smethie, Jr., William
39Ar的半衰期为269年，具有限制海洋通风和运输的巨大潜力。在这里，我们使用稳定的海洋环流逆模型来估计39 Ar的分布。我们的估计与可用的39 Ar测量结果相匹配，在现代氩的绝对误差为1.9%以内，没有重大偏差。我们发现，39Ar示踪出世界海洋的通风途径，39Ar年龄Γ Ar和理想的平均年龄有广泛相似的大尺度模式。在地表，除了高纬度地区，39Ar接近饱和。相对于大气，欠饱和度使地表沃茨的39 Ar年龄有限，南极沃茨的峰值超过100年。这一水库年龄随着南极底层水传播到内陆，使太平洋和印度洋深处的阿贝年龄提高了50年。我们的估计确定了39Ar的大尺度梯度和不确定性模式，从而为未来的测量提供指导。
39Ar with its 269‐year half‐life has great potential for constraining ocean ventilation and transport. Here we estimate the distribution of39Ar using a steady ocean circulation inverse model. Our estimates match available39Ar measurements to within an absolute error of ∼9% modern argon without major biases. We find that39Ar traces out the world ocean's ventilation pathways and that the39Ar age ΓArand the ideal mean age have broadly similar large‐scale patterns. At the surface,39Ar is close to saturated except at high latitudes. Undersaturation imparts a finite39Ar age to surface waters relative to the atmosphere, with peak values exceeding 100 years in Antarctic waters. This reservoir age is propagated into the interior with Antarctic Bottom Water, elevating ΓArby ∼50 years in the deep Pacific and Indian oceans. Our estimates identify the large‐scale gradients and uncertainty patterns of39Ar, thus providing guidance for future measurements.