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有机碳沉积作用在一定时间尺度上形成海洋碳汇作用的最终净效应,北冰洋陆架的有机碳沉积作用在全球碳循环中有着尤为重要的地位。为了测定楚科奇海陆架的有机碳沉积通量,应用210Pb测年法对中国第3次北极考察R17站位的沉积物样品的年龄及沉积速率进行了分析测定,并结合表层沉积物中有机碳的含量计算得到了楚科奇海陆架北缘的有机碳沉积通量。结果显示,该站位的沉积速率为0.6 mm.a-1,表观沉积质量通量为0.72 kg.m-2.a-1,有机碳沉积通量为517 mmol C.m-2.a-1。经估算,真光层输出的有机碳中约有29%被长期封存在沉积物中,远高于中低纬度的正常值(～10%),说明楚科奇海陆架区具有高效的碳汇作用。
Organic carbon deposition is the net effect of ocean carbon sink formed on a time scale. Organic carbon deposition in the Arctic shelf plays an especially important role in the global carbon cycle. In order to determine the organic carbon deposition flux of the Chukchi Sea Shelf, the 210Pb dating method was used to analyze the sediment samples from the 3rd Arctic Pilot Station R17 in China. The sediment samples were analyzed for their age and deposition rate. Carbon content The organic carbon deposition fluxes of the northern Chukchi Sea shelf were calculated. The results show that the deposition rate of this station is 0.6 mm.a-1, the apparent deposition mass flux is 0.72 kg.m-2.a-1, and the organic carbon deposition flux is 517 mmol Cm-2.a-1 . It has been estimated that about 29% of the organic carbon output from the euphotic layer is contained in the sediments for a long time, which is much higher than the normal value (-10%) in the middle and low latitudes, indicating that the Chukchi Sea shelf area has high carbon sink effect .