Abstract
We have conducted the measurement of high accurate CO2 mixing ratio profiles by measuring the temperature profiles simultaneously using the three wavelength CO2 DIAL. The measurements of CO2 diurnal variation in the lower atmosphere were carried out on sunny and cloudy days respectively. We find out that increasing of the CO2 mixing ratio occurs over the altitude of about 2 km from the surface during nighttime. On the other hand, the CO2 mixing ratio decreases over the lower atmosphere during daytime. In particular, the CO2 mixing ratio decreases earlier on sunny days than on cloudy days after sunrise. This result suggests that CO2 absorption by photosynthesis greatly contributes to the strength of the solar radiation.
Highlights
Validating and improving the global atmospheric transport model requires precise measurement of the carbon dioxide (CO2) profile
In the DIAL observation, the temperature dependence of the CO2 mixing ratio due to the temperature dependence of the absorption cross section is 1.6 ppm/K near the ground and the air density in the atmosphere. This means that the difference between the model and the actual temperature profile greatly influences the accuracy of the CO2 mixing ratio
We report on the details of CO2 diurnal variations and the differences in CO2 profiles due to weather
Summary
Validating and improving the global atmospheric transport model requires precise measurement of the carbon dioxide (CO2) profile. We have developed a ground based direct detection three ZDYHOHQJWK ȝP DIAL to achieve measurements of vertical CO2 concentration and temperature profiles in the atmosphere[1,2,3]. In the DIAL observation, the temperature dependence of the CO2 mixing ratio due to the temperature dependence of the absorption cross section is 1.6 ppm/K near the ground and the air density in the atmosphere. This means that the difference between the model and the actual temperature profile greatly influences the accuracy of the CO2 mixing ratio. We report on the details of CO2 diurnal variations and the differences in CO2 profiles due to weather
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