Carbon and Mineral Fluxes from Hydrothermal Plumes: Biogeochemical Linkages with the Upper Water Column

小行星9314591 来自热液柱的碳和矿物通量：与上层水柱的生物地球化学联系 连续四年在奋进岭附近进行的生物声学调查显示，在1800至1900 m深处的蔓延热液羽流顶部上方的散射层中，非底栖浮游动物浓度很高。 最令人兴奋的是，有强有力的证据表明，在羽流顶部上方50至100米厚的一层中，浮游动物生物量增加了10至100倍。 这一研究项目将审查以下假设：热液喷口对喷口区和羽流深度界限以外的浮游动物生物量的垂直分布和组成产生显著影响。 该项目将使用声学传感器和摄影设备，并结合同步拖网：（1）核实东北太平洋胡安·德富卡海岭附近深海和中层浮游动物散射层的分布和组成;（2）确定“海洋雪”的垂直分布和组成，并确定其与散射层的关系;（3）研究烟羽深度上升物质通量的大小和特征。 将从热液喷发与深海和中深海水柱之间潜在的碳和矿物联系的动态方面评价由此产生的数据。 ***

9314591 Cowen Carbon and Mineral Fluxes from Hydrothermal Plumes: Biogeochemical Linkages with the Upper Water Column Bioaccoustical surveys conducted near Endeavor Ridge over four consecutive years have revealed intense non-benthic zooplankton concentrations in a scattering layer immediately above the top of the spreading hydrothermal plume at depths of 1800 to 1900 m. Most exciting was the strong evidence for a 10 to 100 fold increase in zooplankton biomass in a 50 to 100 m thick layer immediately above the top of plume. This research project will examine the hypothesis that hydrothermal venting markedly influences the vertical distribution and composition of the zooplankton biomass beyond the limits of the vent field and plume depths. The project will use acoustic sensors and photographic equipment in combination with simultaneous net tows (1) to verify the distribution and composition of deep and mid-depth zooplankton scattering layers in the vicinity of Juan de Fuca Ridge in the North east Pacific; (2) determine the vertical distribution and composition of "marine snow" and establish its relation to the scattering layers; and (3) to investigate the magnitude and characteristics of ascending material fluxes from the plume depths. The resulting data will be evaluated with respect to the dynamics of potential carbon and mineral linkages between hydrothermal venting and the deep and mid-depth ocean water column. ***