Nitrogen Dynamics Within Two International Southern Ocean JGOFS Cruises

南大洋被认为是一个关键区域， 对海洋生产力和全球二氧化碳平衡的影响。 的 众所周知，该地区全年的营养物质含量都很高，但极端 所有尺度上的时间和空间变异性都在 生产力 该项目将侧重于氮动力学， 强调新的生产，即光合生产或 以硝酸盐为氮源的有机物质。 控制新生产的环境因素似乎是 与温带海洋不同。 实验的目的是确定新的 生产和各种因素，如辐照度，异养 减少氮化合物的使用，以及尿素和 氨这项研究将在两个国际， 英国和法国船只上的多学科巡航。的 与国际科学家的合作， 有机会推进这一领域。

The Southern Ocean is recognized as a critical region with regard to its oceanic productivity and global carbon dioxide balance. The region is known to be elevated in nutrients year-round, but extreme temporal and spatial variability on all scales is observed in the productivity. This project will focus on nitrogen dynamics, with an emphasis on new production, that photosynthetic production or organic material based on nitrate as a nitrogen source. Environmental factors controlling new production appear to be different in the Antarctic compared to temperate seas. Experiments aim to determine the relationship between new production and various factors such as irradiance, heterotrophic use of reduced nitrogen compounds, and concentrations of urea and ammonia. The research will be conducted on two international, multidisciplinary cruises on British and French ships. The collaboration with international scientists provides an excellent opportunity to advance this field.