摘要
热带地区由于生物活力高,具有向大气释放大量痕量气体和气溶胶的潜力。释放方式可以是来自土壤和植物的痕量气体流(在这些地方气体组分被生物产生又被消耗),也可以是植被火灾的烟雾释放。在过去10年中,已投入了很大科研力量对非洲大陆的这些通量进行定意。我们发现,生物源释放和火源释放二者对区域和全球大气化学、特别是光氧化过程和对流层臭氧产生了有力影响。来自非洲大陆的放射性活性气体和气溶胶释放有可能在气候方面具有重要影响,但目前获得的数据尚不足以可靠地定量评估这一效应。
Tropical regions, with their high biological activity, have the potential to emit large amounts of trace gases and aerosols to the atmosphere. This can take the form of trace gas fluxes from soils and vegetation, where gaseous species are produced and consumed by living organisms, or of smoke emissions from vegetation fires. In the last decade, considerable scientific effort has gone into quantifying these fluxes from the African continent. We find that both biogenic and pyrogenic emissions have a powerful impact on regional and global atmospheric chemistry, particularly on photooxidation processes and tropospheric ozone. The emissions of radiatively active gases and aerosols from the African continent are likely to have a significant climatic effect, but presently available data are not sufficient for reliable quantitative estimates of this effect.
