Nitrogen Dynamics Within Two International Southern Ocean JGOFS Cruises

就其海洋生产力和全球二氧化碳平衡而言，南大洋被认为是一个关键区域。众所周知，该地区的营养物质全年都在增加，但在所有尺度上的生产力都存在极端的时空变化。本项目将重点关注氮动力学，重点关注新的生产，即光合作用生产或以硝酸盐为氮源的有机物质。与温带海洋相比，控制新产量的环境因素在南极似乎有所不同。实验旨在确定新产量与各种因素之间的关系，如辐照度、异养使用的还原性氮化合物以及尿素和氨的浓度。这项研究将在英国和法国的两艘国际多学科游轮上进行。与国际科学家的合作为推进这一领域提供了极好的机会。

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.