1. Characteristics of CO2Concentration and Flux in the Beijing Urban Area
- Author
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Cheng, X. L., Liu, X. M., Liu, Y. J., and Hu, F.
- Abstract
Since February 2012, CO2, H2O, and wind data at 10 Hz have been measured by the open‐path eddy covariance systems at 8, 16, 47, 80, 140, 200, and 280 m above ground level on the 325 m Beijing meteorological tower. Analysis of the data from 2013 to 2016 indicates that the annual averaged CO2concentration increased and the local and regional CO2emission decreased with the sequestration of background CO2concentration. The maximum values occurred during winter, and the minimum values occurred during summer. During spring, summer, and autumn, there was a constant CO2flux layer from 47 m to 140 m. However, during winter, CO2flux increased with height, and the maximum appeared at approximately 140 m and then decreased with height. Above 47 m, the CO2fluxes were represented as the net efflux, and below 16 m, the fluxes were near zero or a net uptake. At all observed heights, the diurnal variation in the CO2concentration displayed a clear cycle with a peak corresponding to the morning transportation rush hour. The local wavelet power spectra of the CO2concentration, CO2flux, and other meteorological elements identified significant cross‐wavelet powers near the 24 h and 365 day bands for the CO2concentration and flux with temperature, wind speed, friction velocity, and turbulent kinetic energy. Annual averaged CO2concentrations increased, while local one decreased with the sequestration of backgroundCO2concentration yearlyAbove 47 m, CO2flux was represented as net efflux; below 16 m, net uptake occurred because vegetation dominated in the fetch of the instrumentCO2concentration and flux varied in adiurnal cycle and had significant cross‐wavelet powers with other meteorological elements
- Published
- 2018
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