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首页> 外文期刊>Marine Chemistry >Ammonium accumulation during a silicate-limited diatom bloom indicates the potential for ammonia emission events
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Ammonium accumulation during a silicate-limited diatom bloom indicates the potential for ammonia emission events

机译：硅酸盐限制的硅藻水华期间铵积累表明氨释放事件的可能性

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Ammonium (NH_4~+) concentration was measured at 15 stations in the NE Atlantic during the declining phase of the spring diatom bloom as part of the FISHES 2001 cruise. The NE Atlantic temperate spring bloom is one of the largest seasonal events in the oceanic cycle of primary productivity and represents the conversion of large amounts of oxidized nitrogen to organic (reduced) nitrogen by planktonic photosynthesis, much of which is recycled by heterotrophs as reduced N (DON and ammonium). We might expect recycled ammonium to be rapidly re-used by photosynthesizers. However, during the FISHES cruise the decline of the bloom was accompanied by a substantial buildup of dissolved ammonium (from ～100 nM to > 500 nM near the sea surface) caused by a temporary imbalance in production and consumption processes. Calculations of air-sea ammonia (NH_3) flux under assumed 'normal' 'peak bloom' and 'post-diatom-bloom' conditions are presented and these demonstrate that over a wide range of temperatures, post-bloom accumulation of ammonium will lead to changes in the magnitude and direction of air-sea ammonia flux. If our results are generally applicable then the seasonal succession of plankton communities may be accompanied by periods of anomalously high ammonium concentration and hence be disproportionately important for air-sea ammonia flux. Once in the atmosphere, ammonia neutralizes acidity and in doing so plays a potentially significant role in climate forcing via aerosol formation.
机译：作为FISHES 2001巡游的一部分，在春季硅藻盛开的下降阶段，在东北大西洋的15个站点测量了铵（NH_4〜+）的浓度。东北大西洋温带春季开花是初级生产力海洋周期中最大的季节性事件之一，代表浮游生物通过光合作用将大量的氧化氮转化为有机（还原的）氮，其中大部分被异养生物循环利用，还原为氮。 （DON和铵）。我们可能希望回收的铵能被光合作用器快速重复使用。但是，在FISHES航行期间，由于生产和消费过程的暂时失衡，水华的下降伴随着大量溶解铵的积累（从海面附近的约100 nM到> 500 nM）。给出了在假定的“正常”“高峰”和“硅藻后”条件下的气-海氨（NH_3）通量的计算，这些结果表明，在很宽的温度范围内，溴后的积累将导致空气-海氨通量的大小和方向发生变化。如果我们的结果普遍适用，那么浮游生物群落的季节性演替可能伴随着铵浓度异常高的时期，因此对于空气-海氨通量而言尤为重要。氨一旦进入大气，就会中和酸度，并通过气溶胶的形成在强迫气候中发挥潜在的重要作用。

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