Sedimentary Pore Water DOC:Fluxes and Molecular Composition

孔隙水DOC向上覆沃茨的通量和沉积物中DOC的循环是海洋碳循环的重要组成部分，但制约性较差。 初步的孔隙水工作和原位底栖三脚架通量估计提出了三个假设：1）海洋沉积物是水柱DOC的重要来源，2）通量的一个组成部分有助于难处理的水柱DOC池，和3）通量的一个组成部分可能在沉积物-水界面附近被氧化。 第一个假设将通过使用一个海底三脚架来检验，以便沿横跨大陆架到上斜坡的深度梯度沿着精确测量这一通量。 第二个假设将通过在几次部署结束时将通量三脚架中的上覆水合并以形成超滤的大体积样品来进行测试，我们将在分子水平上对其进行表征，并与类似表征的水柱DOC进行比较。 一个原位透析采样器，以采样孔隙水DOC浓度和原位氧浓度操纵实验将测试第三个和所有将发生沿着太平洋西北成本，关闭墨西哥西北海岸和普吉特湾。

The flux of pore water DOC to overlying waters and the cycling of DOC within sediments are important but poorly constrained components of the oceanic carbon cycle. Preliminary pore water work and in situ benthic tripod flux estimates suggest three hypotheses: 1) marine sediments are an important source of water column DOC, 2) a component of the flux contributes to the refractory water column DOC pool, and 3) A component of the flux may be oxidized near the sediment water interface. The first hypothesis will be tested by using a benthic tripod to accurately measure this flux along a depth gradient reaching across the shelf to upper slope. The second hypothesis will be tested by pooling the overlying water in the flux tripod at the end of several deployments to form an ultrafiltered large volume sample that we will characterize at the molecular level and compare to similarly characterized water column DOC. An in situ dialysis sampler to sample for pore water DOC concentration and in situ oxygen concentration manipulation experiments will test the third and all will take place along the Pacific Northwest cost, off the northwest coast of Mexico and in the Puget Sound.