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Variations of near-surface atmospheric CO_(2.and H_(2.O concentrations during summer on Muztagata

Science china Earth sciences 2006年第1期49卷 18-26页

作者： xu baiqing1,2. yao tandong1,{2., liu xianqin2.& li zhen2.1. laboratory of environment and process on tibetan plateau, institute of tibetan plateau research, chinese academy of sciences, beijing 100085, china 2. Key laboratory of Cryosphere and environment, Jointly Established by Cold and Arid Regions environmental and Engi-neering research {12. and institute of tibetan plateau research, chinese academy of sciences and chinese academy of Meteorological sciences, china Meteorological Administration, Lanzhou 730000, china 1. laboratory of environment and {2. on tibetan plateau Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China 2. Key laboratory of Cryosphere and environment Jointly Established by Cold and Arid Regions Environmental and Engineering Research Institute and Institute of Tibetan Plateau Research Chinese Academy of Sciences and Chinese Academy of Meteorological Sciences China Meteorological Administration Lanzhou 730000 China

Expeditions during the summers of 2.02.and 2.03 implemented continuous monitoring of near-surface (2.m height) atmospheric CO2.and H2. concentrations at the 4500 m elevation on Muztagata. The resultant data sets reveal a slight decrease of CO2.concentrations (of about 5 μmol·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 2.02.were around 5 μmol·mol?1 lower than those during the same period of 2.03, whereas the diurnal amplitude was higher. In contrast, we found that the daily mean atmospheric H2. content in 2.03 was much lower than that in 2.02.and there exists a striking negative correlation between CO2.and H2. con-centrations. We therefore suggest that the near-surface atmospheric CO2.concentration is affected not only by photosynthesis and respiration, but also by the air H2. content in the glaciated region around Muztagata.

关键词： atmospheric CO2 and H2. concentration, continuous monitoring, glaciation region, Muztagata.

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