In Situ Rates of Sulfate Reduction and Volatile Organic AcidMetabolism in the Black Sea

该项目的重点是硫酸盐还原率， 黑海的缺氧水柱和表层沉积物。 结合测定的有机碳埋藏率， 沉积物柱，以及由持续沉积物确定的输入速率 陷阱的研究，其结果将提供重要的定量 的速率和深度分布的信息， 硫循环 短链有机物的额外测量- 酸浓度分布加原位放射性示踪剂 水柱和沉积物的周转率应提供 关于有机酸的作用的新见解，特别是 乙酸盐和其他潜在的重要中间体。 水柱流速测量将由现场进行- 受试仪器，采样器孵育装置（SID），即 能够完成样品采购的所有操作， 放射性示踪剂引入、孵育和时间序列退出 并直接在原位固定子样品。 沙率 测量将使用自由落体三脚架车辆进行。 这些车辆将配备新开发的沉积物 注射器，这将允许准确的原位引入 放射性示踪剂在一个连续的轨道，从10厘米的深度，通过 表面并进入覆盖的绒毛层。

This project is focused on sulfate reduction rates in the anoxic water column and superficial sediments of the Black Sea. In combination with measured organic-carbon burial-rates in the sediment column, and input rates determined by ongoing sediment trap studies, the results will provide important quantitative information of rates and depth distributions of both carbon and sulfur cycling. Additional measurements of short-chain organic- acid-concentration distributions plus in situ radiotracer turnover rates in the water column and sediments should provide new insights concerning the roles of organic acids, particularly acetate, and other potentially significant intermediates. Water column rate measurements will be conducted by a field- tested instrument, the Sampler Incubation Device (SID), that is capable of performing all operations of sample procurement, radiotracer introduction, incubation, and time series withdrawal and fixation of subsamples directly in situ. Sediment rate measurements will be conducted using free-fall tripod vehicles. These vehicles will be equipped with newly developed sediment injectors that will permit the accurate in situ introduction of radiotracers in a continuous track from a depth of 10 cm through the surface and into the overlying fluff layer.