Collaborative Research on Bloom Dynamics and Food Web Structure in the Ross Sea: Vertical Flux of Carbon and Nitrogen

9317598冬季极地海洋浮游植物的生长季节很短，但强度很大。越来越多的证据表明，在许多南极栖息地，最活跃的时期可能是季节的早期，这一时期在以前的调查中没有得到强调。该项目是一个跨学科项目的一部分，该项目重点研究南极高产的罗斯海的春季浮游植物水华的动态。整个计划将测试与浮游植物在冰川融化后不久开始繁殖的假设，控制春季浮游植物生长和生产力的机制，春季高生产力的含义和短期命运，以及从春季到仲夏条件的过渡。这一部分将侧重于收集垂直通量样本，对这些样本进行碳、氮和总质量通量分析，并提供给其他调查人员进行具体分析。将使用非接触照相方法绘制水柱中大集合体丰度的轮廓。这些数据将用于补充其他颗粒测定，调查这些聚集体在颗粒通量中的作用，并确定颗粒输出作为季节和浮游植物物种的函数的机制。最终结果将是更好地了解布卢姆进程，并对这一环境中的聚集和出口机制数据库作出重大贡献。

9317598 Asper The growing season for phytoplankton in polar oceans is short, but intense. There is an increasing body of evidence that in many Antarctic habitats, the most active period may be very early in the season, a period that has not been emphasized in previous investigations. This project is part of an interdisciplinary program that focuses on the dynamics of the spring phytoplankton bloom in a highly productive subsystem of the Antarctic, the Ross Sea. The overall program will test hypotheses related to the initiation of the phytoplankton bloom shortly after the onset of ice melt, the mechanisms controlling phytoplankton growth and productivity in spring, the implications and short-term fate of high productivity in spring, and the transition from spring to midsummer conditions. This component will focus on the collection of vertical flux samples which will be analyzed for carbon, nitrogen and total mass flux and also provided to the other investigators for their specific analyses. Profiles of the abundance of large aggregates in the water column using a non- contact photographic method will be made. These data will be used to complement other particle determinations, to investigate the role of these aggregates in particle flux and to determine the mechanisms of particle export as a function of season and phytoplankton species. The end result will be a better understanding of the bloom processes and significant contributions to the data base on aggregates and export mechanisms in this environment.