Microbial metabolism directly affects trace gases in (sub) polar snowpacks.
Microbial metabolism directly affects trace gases in (sub) polar snowpacks.
复制标题
微生物代谢直接影响（亚）极地积雪中的微量气体。
DOI：
10.1098/rsif.2017.0729
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Redeker KR
中科院分区：
文献类型：
--
作者：
Redeker KR
被困在冰中的微量气体的浓度被认为是唯一的发展从直接雪/大气相互作用在接触的时间。这一假设依赖于从雪到雪再到冰的过渡过程中发生的有限或没有生物，化学或物理转变;这一过程可能需要几十年才能完成。在这里，我们提出的第一个证据，由于在sitummicrobial代谢的微量气体（甲基卤化物和二甲基硫醚）在极地雪的环境变化。我们收集了证据，正在进行的微生物代谢从北极和南极地区在不同的年份。暴露于增强的紫外线辐射后，积雪中的甲基碘生产显着下降。我们的研究结果还表明，在气候解释中使用的其他甲基卤化物，包括甲基溴和甲基氯的生产和消费有很大的差异。这些结果表明，这种长期被忽视的微生物活动可能构成气候历史解释中的潜在错误来源，通过引入一个迄今为止未被认识到的偏置源，在定量的大气来源的痕量气体被困在极地冰盖。
Concentrations of trace gases trapped in ice are considered to develop uniquely from direct snow/atmosphere interactions at the time of contact. This assumption relies upon limited or no biological, chemical or physical transformations occurring during transition from snow to firn to ice; a process that can take decades to complete. Here, we present the first evidence of environmental alteration due toin situmicrobial metabolism of trace gases (methyl halides and dimethyl sulfide) in polar snow. We collected evidence for ongoing microbial metabolism from an Arctic and an Antarctic location during different years. Methyl iodide production in the snowpack decreased significantly after exposure to enhanced UV radiation. Our results also show large variations in the production and consumption of other methyl halides, including methyl bromide and methyl chloride, used in climate interpretations. These results suggest that this long-neglected microbial activity could constitute a potential source of error in climate history interpretations, by introducing a so far unappreciated source of bias in the quantification of atmospheric-derived trace gases trapped within the polar ice caps.