| Summary: | 运用210Po/210Pb不平衡法和234Th/238U不平衡法分别在中国第四次和第五次北极科学考察期间估算了楚科奇海和加拿大海盆的POC输出通量及其随时间的变化情况，同时评估了过去20年来北冰洋的POC输出通量的变化情况。研究结果显示，在第四次北极科学考察期间（2010年7~9月），研究区域真光层中颗粒态210Po的停留时间在-14.92a~1.52a，高于溶解态210Po的停留时间-7.17a~-0.70a，所有测站中溶解态210Po存在明显的过剩，210Po/210Pb的平均值为1.91±0.20。采用两种计算方法（E法和B法）估算了真光层POC输出通量，结果显示从南到北呈现出下降趋势。. Export fluxes of particulate organic carbon (POC) were derived from 210Po/210Pb disequilibrium method and 234Th/238U disequilibrium method during the 4Th and 5Th Chinese National Arctic Research Expedition (CHINARE-4, July 1~September 28, 2010, and CHINARE-5 ), respectively. In 2010,the average residence time of particulate 210Po were in the range of -14.92 a~1.52 a, which is higher than that of . 学位：理学博士 院系专业：海洋与地球学院_海洋化学 学号：22420090153250
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