Fluxes of Dissolved Inorganic Nitrogen (DIN) and Dissolved Organic Matter (DOM) during the Spring Bloom in the Temper- ate North Atlantic Ocean: Magnitude and Control Mechanisms

溶解态转化的合作研究 无机氮（DIN）和溶解有机物（DOM）（两者 浮游植物和浮游细菌对氮和碳的影响 在东北部的春季浮游生物繁盛期， 大西洋 DIN和DOM通量的观测研究刺激了 将DIN和DOM流一起视为 功能定义的生物群体的输入和输出。 浮游植物固定DIN， 浮游细菌通常控制着氮的流动， 透光带根据浮游生物的概念化 动力学，这项研究将遵循氮的转化， 从硝酸盐氮（NO3）向 春季的上层海洋，浮游植物对其的固定， 它的再生和循环由细菌和其他微型浮游生物。 这些目标包括： a）精确地量化透光层供应、存量和 NO3的利用; B）通过新的高精度测定 技术，初级生产对新的和 再生营养素; c）评估细菌的重要性 一般来说，细菌作为竞争对手， 浮游植物对NH 4的影响; d）确定微生物的影响 再生NH 4对初级氮的可用性 （1）最后，（2）评价 浮游植物和细菌的生产以及PON的输出， POC在几天-几周的时间尺度上。

A collaborative study of the transformations of dissolved inorganic Nitrogen (DIN) and dissolved organic matter (DOM) (both N and C) by phytoplankton and bacterioplankton will be conducted during the spring plankton bloom period in the Eastern North Atlantic Ocean. Observational studies of DIN and DOM fluxes have stimulated network models which consider together DIN and DOM flows as inputs and outputs of functionally-defined groups of organisms. Fixation of DIN by phytoplankton and of DOM and NH4 by bacterioplankton often dominate the flow of Nitrogen in the euphotic zone. Informed by this conceptualization of plankton dynamics, the study will follow the transformations of Nitrogen, beginning with the transport of nitrate-Nitrogen (NO3) to the upper ocean during the spring, its fixation by phytoplankton, and its regeneration and cycling by bacteria and other microplankton. The objectives include: a) precisely quantifying the euphotic zone supply, stock and utilization of NO3; b) determining via new high precision techniques, the reliance of primary production on new and regenerated nutrients; c) assessing the significance of bacterial production in general, of bacteria as competitors with phytoplankton for NH4; d) determining the impact of microbial regeneration of NH4 on the availability of Nitrogen for primary production; and finally e) evaluating the relationship between phytoplankton and bacterial production and the export of PON and POC over time scales of days-weeks.