腾格里沙漠民勤实验点夏季沙丘CO2浓度变化

doi:10.11820/dlkxjz.2010.11.024

Abstract

Abstract:

We have measured the diurnal changes of dune CO₂ concentration under different depth by using the infrared monitoring instruments in Minqin County in 2009, and combined the results with simultaneous temperature data. The results show that the CO₂ concentration of -2 m and -4 m always greater than that of -1 m. The diurnal CO₂ cumulative concentration from this research can be ranked as fixed dunes > semi-fixed dune > moving dune. The CO₂ cumulative concentration is greater at daytime than at nighttime. For fixed, semi-fixed and moving sand dunes, the CO₂ concentration has a changing law of“low to high and then to low”from the morning to the next morning, which is basically the same as the change of temperature, but the change of the former is later than that of the latter. There is a significant positive correlation between the CO₂ concentration of dunes and atmospheric temperature, and temperature is the main factor determining the changing law of the dune CO₂ concentration. In addition, the diurnal concentration of CO₂ can be changed due to the difference in soil conditions, such as soil moisture, light and wind speed. So, it is of great significance to conduct research into the cause of global warming and the impacts of destruction of vegetation on atmospheric CO₂, which can help to find out the changing law of dune CO₂ concentration in 24 hours.

Key words: concentration at different depths, CO₂ release, dune CO₂ concentration, influencing factors, Tengger Desert, the law of diurnal change

ZHAO Jingbo, SHAO Tianjie, YU Keke, LI Enju, CHENG Aifang, MENG Jingjing, DONG Zhibao. Study on the Change of Dune CO₂ Concentration in Summer at Minqin in Tengger Desert[J].PROGRESS IN GEOGRAPHY, 2010, 29(11): 1368-1374.

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Study on the Change of Dune CO₂ Concentration in Summer at Minqin in Tengger Desert

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Study on the Change of Dune CO2 Concentration in Summer at Minqin in Tengger Desert

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Study on the Change of Dune CO₂ Concentration in Summer at Minqin in Tengger Desert