Ice Station POLarstern (ISPOL) Fe + C incubations

Here, we hypothesize that Fe uptake rates by sea-ice algae and under-ice phytoplankton are higher than the rates reported for open ocean phytoplankton in the SO. We performed 55Fe and carbon (14C) short-term uptake field measurements in, on and under Antarctic sea ice. We collected under ice seawater, melted snow and sea-ice cores. We then spiked them with 14C or 55Fe radiotracers to measure Fe and C uptake rates by sea-ice algae. Samples were then filtered, and residual radioactivity on the filters measured liquid scintillation counter (Packard).

我们在此假设，南极海冰藻类及冰下浮游植物的铁吸收速率高于南大洋（Southern Ocean，简称SO）开阔海域浮游植物的已有报道速率。我们在南极海冰内部、表面及冰下开展了55Fe与碳（14C）的短期吸收现场测量。我们采集了冰下海水、融雪及海冰岩心样本，随后向样本中添加14C或55Fe放射性示踪剂，以测定海冰藻类对铁和碳的吸收速率。样本经过滤后，使用液体闪烁计数器（Packard）测量滤膜上的残留放射性。