Solute exchange across the sediment-water interface in the HAUSGARTEN area (Fram Strait) in 2015 (POLARSTERN cruise PS93.2)

During PS85 (in 2014) and PS93.2 (in 2015) sediment cores were recovered by a Multiple corer. A sodium bromide solution of similar density as seawater (1028 g/L) replaced the overlying water of the cores. Three subsamples of water were taken during an incubation at three different times (t0, t1, t2) and stored at 4 °C. Removed water volume of the subsampling at t1 was replaced with the NaBr-seawater solution. The bromide concentrations were measured using ion chromatography. The dilution of the t2-sample, due to the sampling procedure, was corrected by the known bromide concentration in the removed and the added water. The solute exchange is represented by the bromide flux

2014年PS85航次与2015年PS93.2航次中，研究人员借助多管采样器（Multiple corer）获取了沉积物岩芯。配制了密度与海水相近（1028 g/L）的溴化钠溶液，用以替换岩芯的上覆水。培养过程中，分别于t0、t1、t2三个时间点采集三份水样，并将其保存于4℃环境中。针对t1时刻采样所移除的水体体积，使用溴化钠-海水溶液进行补充。采用离子色谱法测定溴离子浓度。对于t2样品因采样流程引发的稀释效应，通过已测定的移除水体与添加水体中的溴离子浓度完成校正。溶质交换过程以溴离子通量进行表征。