The C37 alkenone record of sea water of time series station DYNAPROC

The concentrations of suspended particulate pigments, C37-C38 alkenones, total organic carbon and nitrogen in the Ligurian Sea (northwestern Mediterranean) have been studied at 5 and 30 m depth during well defined thermocline conditions. An accurate description of the short term changes of these compounds has been achieved by means of four 36-h sampling cycles each encompassing consecutive filtration periods of 4 h. During sampling the thermocline changes were followed closely by simultaneous measurements of water column temperature, salinity and other physical parameters. The analysis of the collected samples indicates that the Haptophyte pigments and alkenones are essentially synthesized at the levels of highest primary production and therefore the C37 alkenone record reflects the seawater temperature at this depth level. The study also shows that part of these alkenones are distributed throughout the water column in association to the suspended particles. […]

本研究对利古里亚海（地中海西北部）5米和30米深度的悬浮颗粒色素浓度、C37-C38碳烯酮、总有机碳和氮含量进行了研究，研究期间处于明确的温跃层条件下。通过四个各包含连续4小时过滤周期的36小时采样循环，精确描述了这些化合物短期变化。在采样过程中，通过同时测量水柱温度、盐度以及其他物理参数，密切跟踪了温跃层的变化。对收集到的样品进行分析表明，褐藻类色素和碳烯酮主要在初级生产力最高的水平上合成，因此C37碳烯酮记录反映了该深度层的海水温度。研究还显示，部分碳烯酮与悬浮颗粒关联分布在整个水柱中。