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通过对西北冰洋海水中18O,226Ra,228Ra的分析,应用δ18O-S-PO*示踪体系计算了水体中河水组分和海冰融化水组分的份额,并根据陆架区与深海盆228Ra/226Ra)A.R.与河水组分之关系的差异估算海盆区河水组分的平均停留时间.结果表明,加拿大海盆的河水份额明显高于陆架区,证实该海盆是陆架所输送河水的主要储存区.楚科奇陆架、波弗特陆架水体中的228Ra活度浓度介于0.16～1.22Bq/m3之间,比中、低纬度陆架区的数值来得低,反映出海冰融化水的影响.陆架水228Ra/226Ra)A.R.与河水组分份额之间具有良好的线性正相关关系,而加拿大海盆水体的228Ra/226Ra)A.R.落在该拟合线下方,反映出水体离开陆架区往深海盆运移过程中228Ra的放射性衰变损失.根据陆架水与海盆水228Ra/226Ra)A.R.与河水组分份额之关系的差异估算出加拿大海盆河水组分的平均停留时间为5.0～11.0a.该停留时间决定了北大西洋深层水形成区域上层水体淡化对北冰洋入海径流响应的滞后时间.
Based on the analysis of 18O, 226Ra and 228Ra in the northwest icy seawater, the δ18O-S-PO * tracer system was used to calculate the share of the river water component and the sea ice melting water component. Based on the analysis of 228Ra / 226Ra) Estimating the average residence time of the river water components in the basin by the difference between the AR and the river water components The results show that the share of the river water in the Canadian basin is significantly higher than that of the shelf area, confirming that the basin is the main storage area for the river water transported by the shelf 228Ra activity concentrations in shelf waters of Bechtel and Beaufort ranged from 0.16 to 1.22 Bq / m3, which were lower than those in the middle and low latitudes of the continental shelf, reflecting the influence of seawater thawing water. The shelf water 228Ra / 226Ra) AR had a good linear positive correlation with the composition of the river water component, while the 228Ra / 226Ra AR of the Canadian Basin waters landed below the fitting line, which reflected that during the migration from the shelf area to the deep sea basin, the 228Ra .According to the difference between the 228Ra / 226Ra AR and the share of river water components in shelf and sea water, it is estimated that the average residence time of Canadian basin river water components is 5.0-11.0a. The residence time determines the relationship between Peking University Deep ocean water to form an upper region of the water desalination Arctic Ocean sea latency response runoff.