摘要
"94’苔原生态"考察队研究了河流输入到大陆架海域的无机和有机碳及其在海水和沉积物中的生物化学转化。另外,还研究了水和沉积物中的人为放射性核物质、^(137)Cs、^(90)Sr和^(239.240)Pu 。溶解的无机碳的分布表明鄂毕河和叶尼塞河大部分的径流进入北冰洋中心之前都经过了拉普捷夫海。沉积物研究表明不同位置海底氧的吸收、溶解无机碳和养分的迁移都具有明显的差异。切尔诺贝利事故泄漏的^(137)Cs的活动有30%分布在巴伦支海、喀拉海和拉普捷夫海。巴伦支海的^(137)Cs增加了5～8Bq/m^3,喀拉海增加了5～13Bq/m^3,拉普捷夫海增加了8～15Bq/m^3,但在河口出现局部的低浓度。^(90)Sr值也相应地达到2.5,3和4Bq/m^3。
The Tundra Ecology -94 expedition investigated inflow of inorganic are organic carbon to the shelf seas by river runoff, and its transformai by biochemical processes in seawater and sediment. In addition anthropogenic radionuclides, 137Cs,90Sr, arid 239,240Pu, were studied in water and sediments. The distribution of dissolved inorganic carbon indicates that the majority of the Ob and Yenisey discharges flow into the Laptev Sea before entering the central Arctic Ocean. The sediment study shows that there is a marked difference in benthic oxygen uptake, efflux of dissolved inorganic carbon and nutrients between localities. 137Cs activity from the Chernobyl accident is 30% in the Barents, Kara, and Laptev Seas. 137Cs increased from 5-8 Bq m-3 in Barents Sea, 5-13 Bq m-3 in the Kara Sea to 8-15 Bq m-3 in the Laptev Sea, but with locally low concentrations at the river mouths. Corresponding values for 90Sr were 2.5, 3, and 4 Bq m-3, respectively.
