Reductive Sulfur and Carbon Assimilation in Northeastern Pacific Ocean Microplankton

将研究海水和上覆气团中的二甲基硫分布，并从硫酸盐中重新产生还原性硫化合物。放射性硫酸盐与微浮游生物的还原（蛋白质和代谢物）和非还原（硫脂和硫酸盐酯）成分的结合将作为光场和深度在自然发生的昼夜循环中的函数进行测量。将以类似的方式进行放射性碳酸氢盐并入细胞成分的额外测量，以确定(a)归因于浮游植物的还原性硫酸盐同化的比例，以及(b)碳基生产力测量对浮游植物硫酸盐还原的适用性，从而确定潜在的挥发性硫化合物释放。将估算实际产量，以便与二甲基硫化物通量估算值进行比较。

Study will be made of dimethyl sulfide distribution in seawater and overlying air masses with de novo production of reduced sulfur compounds from sulfate. Incorporation of radioactive sulfate into reduced (protein and metabolites) and non-reduced (sulfolipids and sulfate esters) components of microplankton will be measured as a function of light field and depth over the naturally occurring day/night cycle. Additional measurements of radioactive bicarbonate incorporation into cellular constituents will be made in a similar manner to determine (a) the proportion of reductive sulfate assimilation attributable to phytoplankton and (b) the applicability of carbon-based productivity measurements to phytoplankton sulfate reduction and hence potential volatile sulfur compound release. Estimates will be made of areal production for comparison with dimethyl sulfide flux estimates.