… Ocean warming, acidification, nutrient enrichment and … microbial nitrogen cycle, but widespread
ocean deoxygenation … reduced nitrogen (NH 3 or NH 4 + ) into to a completely oxidized …

… Oxygen is fundamental for life and biogeochemical processes in the … life histories, nutrient
cycling, and biodiversity as a proxy of healthy ecosystem functioning. Deoxygenation reduces …

… We pinpoint fundamental knowledge gaps and highlight the need to understand sub-lethal …
shifts of altered nutrient cycling (for example, from nitrification towards nitrogen fixation), …

… 2 fixation is typically considered the primary source of new bioavailable Nr to the ocean.
Rising Nr deposition may thus cause a future imbalance in the oceanic N cycle, at least …

… , the global picture of marine N cycling is yet to explore. Apart from nitrogen cycling, oceanic
redox … must be devoid of dissolved oxygen to the extent of euxinia that nitrate is completely …

… but completely degraded such that heterotrophic nitrogen … feedbacks in the nitrogen cycle
where deoxygenation results in a … of anammox and other N R consuming processes (Fig. 3). In …

… amplify climate-driven ocean deoxygenation. However, the … year −1 nearly completely
counteract each other, resulting in a … in the “Changes in nitrogen cycle” section and Discussion. …

… ocean deoxygenation on marine biogeochemical cycles, as … to the biogeochemical cycles
of several fundamental marine … is the nitrogen cycle: the mineralization of organic nitrogen to …

… Finally, we outline future research directions pertaining to marine N cycling in China … in
the upper ocean, the N cycle is closely related to global change by regulating marine primary …

… such as nutrient cycling and detoxification and removal of pollutants. Ocean biogeochemistry
is … Ocean biogeochemical reactions are mediated by microorganisms that couple oxidation …