The distribution of 3He in the western Atlantic ocean

W.J. Jenkins , W.B. Clarke
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引用次数: 124

Abstract

Over 250 samples of Atlantic seawater have been analyzed for the dissolved helium isotopes, and distinctive pattern has emerged. Two components of excess 3He are seen: a component due to in situ decay of nuclear-era tritium, and a primordial component evolved from the solid Earth. A prominent feature at about 3-km depth can be traced from 5°N along the western boundary to the equator. The source of this feature is most probably in the Gibbs fracture zone, where we suppose that primordial 3He is released into westward-flowing bottom water. The South Atlantic profiles clearly show the effect of 3He-rich CCircumpolar Water, entrained by Antarctic Intermediate Water flowing northward. The excess 3He in the upper 1 km, when combined with tritum concentrations measured byO¨stlund, Dorsey and Rooth (1974, Earth and Planetary Science Letters, 23, 69–86) at the same locations and depths, yields ‘tritium-helium ages’, which in some cases represent the time interval between equilibration wwith the atmosphere and sampling.

he在西大西洋的分布
对250多个大西洋海水样本的溶解氦同位素进行了分析,并出现了独特的模式。过量的氦有两种成分:一种是由核时代氚的原位衰变产生的,另一种是由固体地球演化而来的原始成分。从北纬5°到赤道的西侧边界处,约3公里深处有一个突出的特征。这种特征的来源很可能是在吉布斯断裂带,我们认为原始的3He被释放到向西流动的底水中。南大西洋剖面清楚地显示了富含3he的环极水的影响,这些水是由向北流动的南极中间水携带的。当与o¨stlund, Dorsey和Rooth (1974, Earth and Planetary Science Letters, 23, 69-86)在相同位置和深度测量的氚浓度相结合时,上层1公里的过量3He产生了“氚-氦年龄”,在某些情况下,它代表了与大气平衡和采样之间的时间间隔。
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