资源环境科技发展态势分析平台

In this study, the first in situ static-chamber measurements were conducted at coastal Antarctica tundra for CHCl₃ fluxes, which showed that CHCl₃ was naturally emitted from the Antarctic tundra at 35±27 nmol m^-2 d^-1, comparable to other reported important natural sources. Significantly enhanced CHCl₃ emission rates (66±20 nmol m^-2 d^-1) were observed from ornithogenic soil on the island populated with penguins, which was rich in organic matter and halides coming from penguin excrements. It is estimated that Antarctic tundra emits up to 0.1 Gg CHCl₃ per year, which is an important source for regional atmospheric CHCl₃. Laboratory-based incubations suggested that organic carbon and chlorine inputs by penguins may stimulate O₂ dependent microbial-mediated CHCl₃ emission from the Antarctic tundra, and all tundra soils showed the maximum CHCl₃ emission at 4°C. The strength of this CHCl₃ source is also expected to change in response to Antarctic warming.