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Variation's of near-surface atmospheric CO2 and H2O concentrations during summer on Muztagata
作者: Xu, B.Q., et al.
期刊名称: Science in China Series D-Earth Sciences
发表年度: 2006
卷: 49
期: 1
联系作者:
页码: 18-26
摘要: Expeditions during the summers of 2002 and 2003 implemented continuous monitoring of near-surface (2 m height) atmospheric CO2 and H2O concentrations at the 4500 m elevation on Muztagata. The resultant data sets reveal a slight decrease Of CO2 concentrations (of about 5 mu mol center dot mol(-1)) and changes in the diurnal variations from the end of June to the middle August. The daily maximum CO2 concentrations occur between 02:30-05:30 AM (local time) and the minimum levels occur between 12:00-15:30 PM. The atmospheric CO2 concentrations in the summer of 2002 were around 5 mu mol center dot mol(-1) lower than those during the same period of 2003, whereas the diurnal amplitude was higher. In contrast, we found that the daily mean atmospheric H2O content in 2003 was much lower than that in 2002 and there exists a striking negative correlation between CO2 and H2O concentrations. We therefore suggest that the near-surface atmospheric CO2 concentration is affected not only by photosynthesis and respiration, but also by the air H2O content in the glaciated region around Muztagata.

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