The trends of global tritium precipitations.
The trends of global tritium precipitations.
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全球氚降水量趋势。
DOI：
10.1269/jrr.26.283
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发表时间：
1984
影响因子：
2
通讯作者：
T. Niwa
中科院分区：
文献类型：
--
作者：
Hiroshige Morishima;H. Kawai;T. Koga;T. Niwa
根据国际原子能机构（IAEA）发布的七卷《环境同位素数据》中的氚数据，估算了1953年至1979年全球氚降水量的变化趋势。从世界上 342 个站收集了氚沉淀样品，并由 IAEA 和 27 个实验室测量了氚浓度。由于大气层多次核爆炸，氚降水量在1963年达到最大峰值。1964年《部分禁止核试验条约》达成后，氚降水量逐渐减少，至今呈现季节性变化。为了获得清晰的氚降水趋势，使用日本经济计划局开发的代码从原始时间序列数据中消除了季节性和不规则因素。分析结果如下： a) 每年春末至夏季期间都会观测到氚的峰值浓度和降水量。 b) 北半球站观测到的最大年氚浓度和降水量是在1963年。 c) 在北半球观察到纬度效应。最大浓度和降水出现在北纬约 50° 处。 d) 大陆站总是显示出比同类海上站更高的氚浓度和降水量。
The trends of global tritium precipitation from 1953 to 1979 were estimated based on the tritium data published in seven volumes of Environmental Isotope Data by the International Atomic Energy Agency (IAEA). Tritium precipitation samples were collected from 342 stations in the world and tritium concentrations were measured by IAEA and 27 laboratories. Due to repeated atomospheric nuclear explosions, tritium precipitations showed maximum peak in 1963. After the agreement of the Partial Test Ban Treaty in 1964, they have gradually decreased until now showing seasonal variations. To obtain clear trends of tritium precipitations, seasonal and irregular factors were eliminated from the original time-series data using a code developed by the Japanese Economic Planning Agency. Results of analyses were as follows; a) Peak concentrations and precipitations of tritium were observed every year around the period of late spring to summer. b) The maximum annual tritium concentration and precipitation were observed in 1963 for northern hemisphere stations. c) A latitude effect was observed in the northern hemisphere. The maximum concentrations and precipitations were seen at the latitude of approximately 50°N. d) Continental stations always showed higher tritium concentrations and precipitations than comparable maritime stations.