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High-Resolution Tritium Profile in an Ice Core from Camp Century, Greenland
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-09-29 , DOI: 10.1021/acs.est.1c01975 Jixin Qiao 1 , William Colgan 2 , Gunnar Jakobs 1 , Sven Nielsen 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-09-29 , DOI: 10.1021/acs.est.1c01975 Jixin Qiao 1 , William Colgan 2 , Gunnar Jakobs 1 , Sven Nielsen 1
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We measure 3H in an ice core from Camp Century. The temporal distribution of 3H concentration in the ice core corresponds generally well with the historical record of explosive yields of atmospheric nuclear weapons tests. Maximum 3H values observed in 1962–1963 are comparable to those in ice core or precipitation in many other locations in the Northern Hemisphere. There is no indication that significant 3H contamination was locally released into the air during the operation of the Camp Century reactor. It is, however, somewhat surprising that several prominent 3H peaks are still observed after 1980. We suggest that these are associated with airborne 3H releases from the civil nuclear industry. A wavelet analysis during 1970–2017 indicates the primary frequency of variability in the 3H record is annual 3H peaks. These annual peaks can be combined with the 3H spikes from global fallout of known nuclear weapons tests to benchmark and evaluate theoretical ice core dating scales back to the 1950s. A positive correlation is observed between annual 3H average concentration and variability of Arctic Oscillation (AO). This highlights the value of 3H as a potential tracer for air masses and airborne pollutants in the Arctic.
中文翻译：
格陵兰世纪营地冰芯中的高分辨率氚剖面
我们在 Camp Century 的冰芯中测量了3 H。冰芯中3 H 浓度的时间分布与大气核武器试验爆炸当量的历史记录大致相符。1962-1963 年观测到的最大3 H 值与北半球许多其他地方的冰芯或降水中的值相当。没有迹象表明在 Camp Century 反应堆运行期间，显着的3 H 污染物被局部释放到空气中。然而，有些令人惊讶的是，在 1980 年后仍然观察到几个突出的3 H 峰。我们认为这些与空气中的3H 来自民用核工业的释放。1970-2017 年的小波分析表明3 H 记录中变异的主要频率是每年的3 H 峰值。这些年度峰值可以与已知核武器试验的全球影响的3 H 峰值相结合，以基准和评估可追溯到 1950 年代的理论冰芯测年尺度。在年3 H 平均浓度与北极涛动 (AO) 的变化之间观察到正相关。这突出了3 H 作为北极气团和空气污染物的潜在示踪剂的价值。
更新日期：2021-10-19
中文翻译：
格陵兰世纪营地冰芯中的高分辨率氚剖面
我们在 Camp Century 的冰芯中测量了3 H。冰芯中3 H 浓度的时间分布与大气核武器试验爆炸当量的历史记录大致相符。1962-1963 年观测到的最大3 H 值与北半球许多其他地方的冰芯或降水中的值相当。没有迹象表明在 Camp Century 反应堆运行期间，显着的3 H 污染物被局部释放到空气中。然而，有些令人惊讶的是，在 1980 年后仍然观察到几个突出的3 H 峰。我们认为这些与空气中的3H 来自民用核工业的释放。1970-2017 年的小波分析表明3 H 记录中变异的主要频率是每年的3 H 峰值。这些年度峰值可以与已知核武器试验的全球影响的3 H 峰值相结合，以基准和评估可追溯到 1950 年代的理论冰芯测年尺度。在年3 H 平均浓度与北极涛动 (AO) 的变化之间观察到正相关。这突出了3 H 作为北极气团和空气污染物的潜在示踪剂的价值。
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