The chemistry, sources and sinks of atmospheric reactive nitrogen

人们越来越认识到与活性氮在全球的分布及其对空气质量、酸沉积、气候变化、农业生产和生物多样性等环境问题的影响有关的迫在眉睫的环境危机。人类活动大大加快了固氮速度，导致NOx和NH3的排放量自1860年以来增加了两倍，预计到2050年将进一步翻一番。专家建议，工业固氮率应降低四倍，但要实现这一雄心勃勃的目标及其理由，需要更好地了解控制活性氮源强度的变量，以及排放后的级联影响。

There is growing recognition of the looming environmental crisis related to the planetary distribution of reactive nitrogen, and its impacts on environmental issues such as air quality, acid deposition, climate change, agricultural production, and biodiversity. Human activity has dramatically accelerated the rates of nitrogen fixation, leading to tripling of the emission rates of NOx and NH3 since 1860, with a projection of a further doubling by 2050 . Experts propose that the industrial rate of nitrogen fixation should be decreased by a factor of four , but the ability to meet, and rationale for, this ambitious target requires a better understanding of the variables governing the source strength of reactive nitrogen, and the cascade of impacts following emission.