The study on CO2 concentration and the diurnal variation laws of the highest mega dune in Badain Jaran Desert
Received date: 2009-12-20
Revised date: 2010-06-08
Online published: 2010-11-20
In order to find out the concentration of CO2 in the desert area, its influence on the CO2 in the atmosphere and the role that it plays in the global carbon cycle, the research team utilized infrared monitor of CO2 to observe the concentration of CO2 of the 17 drill holes day and night in May 2009 in the highest desert area in Badain Jaran in the world. Results show that the difference of various observation spots' concentration of CO2 in the desert area in Badain Jaran is relatively big. The concentration of CO2 at each observation spot changes from 0.01% to 0.075%, and the concentration of CO2 at night is low but high in the daytime. The diurnal variation of concentration of CO2 in the desert area in Badain Jaran is obvious, and from 7 am to 6 pm, the concentration of CO2 at different depths ranging from 1 m to 5 m presents the regularity that it changes from low to high, and then from high to low. During 24 hours, four turning points are observed in the concentration of CO2, and they appear at 5 am, 11 am, 18 pm and 21 pm. Under the condition of unchanged water content of sand layer, the diurnal variation in temperature is the main reason for the change of the concentration of CO2 in the sand layer, and the diurnal variation in temperature is positively correlated with the diurnal variation of concentration of CO2 in the desert area. The sand layer's concentration of CO2 with higher water content is obviously higher than that with lower water content. Concentration of CO2 above 5 m in the desert area is higher than that above the surface, which indicates that the highest desert area where the CO2 comes from is also the source of CO2 in the atmosphere, and the sand layer's concentration of CO2 is generated from the activities of germs in the naked high large desert area with nasty environment.
ZHAO Jing-bo, SHAO Tian-jie, LV Xiao-hu, HOU Yu-le, DONG Zhi-bao . The study on CO2 concentration and the diurnal variation laws of the highest mega dune in Badain Jaran Desert[J]. GEOGRAPHICAL RESEARCH, 2010 , 29(11) : 1993 -2003 . DOI: 10.11821/yj2010110008
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