Total dissolved organic carbon and total dissolved nitrogen in sediment pore water of the central Arctic Ocean collected during POLARSTERN cruise ARK-XXVII/3 from August-September 2012

During the RV Polarstern cruise ARK-XXVII/3 to the Arctic Ocean in summer 2012, when sea ice declined to a record minimum bottom, water and sediment pore water samples were collected with a TV-guided multicorer at stations in the Nansen and Amundsen basin. 50 ml sediment pore water samples were collected from 0-1, 1-5 and 5-10 cm sediment depths from up to 4 parallel sediment cores at each station. Additionally, overlying bottom waters were carefully collected from undisturbed sediment cores. Acidified pore water samples (pH2) were used for analysis of DOC and TDN concentrations. The measurements were performed by hand injection via catalytic oxidation at high temperature on a TOC-V Shimadzu instrument.

2012年夏季，极星号（RV Polarstern）执行ARK-XXVII/3航次赴北冰洋开展科考，其时海冰面积降至有记录以来的最低值。研究团队在南森盆地与阿蒙森盆地的各站位处，借助电视引导式多管取样器采集了水体与沉积物孔隙水样品。每个站位最多通过4根平行沉积物岩芯，分别采集0~1 cm、1~5 cm及5~10 cm沉积物深度的50毫升沉积物孔隙水样品。此外，还从未受扰动的沉积物岩芯中谨慎采集了上覆底层海水样品。将孔隙水样品酸化至pH=2后，用于溶解有机碳（Dissolved Organic Carbon，DOC）与总溶解氮（Total Dissolved Nitrogen，TDN）浓度的分析。本次检测采用高温催化氧化-手动进样方式，在岛津TOC-V型总有机碳分析仪上完成。