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ATMOSPHERIC INPUTS OF DISSOLVED ORGANIC NITROGEN TO THE OCEANS

机译：溶解有机氮向海洋的大气输入

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THE input of fixed nitrogen to the oceans by in situ fixation, river/groundwater supply and atmospheric deposition represents an important control on marine productivity on long timescales, and hence on ocean-atmosphere CO2 exchange and its effects on climate(1-3). Any assessment of human perturbation of the global nitrogen cycle also requires an accurate estimate of these inputs. The current best estimates suggest that the natural fluvial and atmospheric inputs are of similar magnitude(3,4), and that globally both have been increased by a factor of two above natural levels as a result of human activity(3-5). Dissolved organic nitrogen represents more than half of the fluvial input of dissolved fixed nitrogen, but current estimates of atmospheric inputs are usually based on only the inorganic (NO3- + NH4+) component, although some authors have recognized the potential importance of organic nitrogen(6-9). Here we present analyses of dissolved organic nitrogen in rain and snow which show that it is a ubiquitous and significant component of precipitation, even in remote marine areas. Our results require an approximate doubling of present estimates of the atmospheric input of fixed nitrogen to the oceans, and an increase in estimates of the total fixed-nitrogen input by a factor of about 1.5. These results indicate that the human impact on the global nitrogen cycle may be larger than has been thought. [References: 39]
机译：通过原位固定，河水/地下水供应和大气沉积向海洋中输入固定氮，代表了对海洋生产力的长期重要控制，从而控制了海洋-大气中的CO2交换及其对气候的影响（1-3）。对人类对全球氮循环的扰动的任何评估也都需要对这些输入的准确估计。目前的最佳估计表明，自然河流和大气输入量的大小相似（3,4），并且由于人类活动，全球两者都比自然水平高了两倍（3-5）。溶解的有机氮占溶解的固定氮的河流输入量的一半以上，但目前对大气输入量的估算通常仅基于无机（NO3- + NH4 +）成分，尽管一些作者已经认识到有机氮的潜在重要性（6） -9）。在这里，我们对雨雪中溶解的有机氮进行了分析，结果表明，即使在边远的海洋地区，它也是普遍存在的重要降水成分。我们的结果要求目前对海洋中固定氮的大气输入估算值大约加倍，并且将总固定氮输入的估算值增加约1.5倍。这些结果表明，人类对全球氮循环的影响可能比想象的要大。 [参考：39]

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