Preprints
https://doi.org/10.5194/acp-2021-103
https://doi.org/10.5194/acp-2021-103

  11 Mar 2021

11 Mar 2021

Review status: a revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Spatial and temporal variations of CO2 mole fractions observed at Beijing, Xianghe and Xinglong in North China

Yang Yang1,2,7, Minqiang Zhou2,3,7, Ting Wang2,7, Bo Yao6, Pengfei Han5, Denghui Ji2,7, Wei Zhou4,7, Yele Sun4,7, Gengchen Wang2,7, and Pucai Wang2,7 Yang Yang et al.
  • 1Shanghai Ecological Forecasting and Remote Sensing Center, Shanghai, China
  • 2Key Laboratory of Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 3Royal Belgian Institute for Space Aeronomy, Brussels, Belgium
  • 4State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 5State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 6The China Meteorological Administration, Meteorological Observation Centre
  • 7University of Chinese Academy of Sciences, Beijing, China

Abstract. Atmospheric CO2 mole fractions are observed at Beijing (BJ), Xianghe (XH), and Xinglong (XL) in North China using the Picarro G2301 Cavity Ring-Down Spectroscopy instruments. The measurement system is described comprehensively for the first time. The geo-distances among these three sites are within 200 km, but they have very different surrounding environments: BJ is inside the megacity; XH is in the suburban area; XL is in the countryside on a mountain. The mean and standard deviation of CO2 mole fractions at BJ, XH, and XL between October 2018 and September 2019 are 448.4 ± 12.8 ppm, 436.0 ± 9.2 ppm and 420.6 ± 8.2 ppm, respectively. The seasonal variations of CO2 at these three sites are similar, with a maximum in winter and a minimum in summer, which is dominated by the terrestrial ecosystem. However, the seasonal variations of CO2 at BJ and XH are more affected by human activities as compared to XL. By using CO2 at XL as the background, CO2 enhancements are observed simultaneously at BJ and XH. The diurnal variations of CO2 are driven by the boundary layer height, photosynthesis and human activities at BJ, XH and XL. Moreover, we address the impact of the wind on the CO2 mole fractions at BJ and XL. This study provides an insight into the spatial and temporal variations of CO2 mole fractions in North China.

Yang Yang et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-103', Anonymous Referee #3, 24 Mar 2021
    • AC1: 'Reply on RC1', Yang Yang, 18 Jun 2021
    • AC3: 'Reply on RC1', Yang Yang, 18 Jun 2021
  • RC2: 'Comment on acp-2021-103', Anonymous Referee #2, 04 Apr 2021
    • AC2: 'Reply on RC2', Yang Yang, 18 Jun 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-103', Anonymous Referee #3, 24 Mar 2021
    • AC1: 'Reply on RC1', Yang Yang, 18 Jun 2021
    • AC3: 'Reply on RC1', Yang Yang, 18 Jun 2021
  • RC2: 'Comment on acp-2021-103', Anonymous Referee #2, 04 Apr 2021
    • AC2: 'Reply on RC2', Yang Yang, 18 Jun 2021

Yang Yang et al.

Yang Yang et al.

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Short summary
This study introduces the in situ CO2 measurement system installed in Beijing(urban), Xianghe(suburban), and Xinglong(rural) in North China for the first time. The spatial and temporal variations of CO2 mole fractions at the three sites between June 2018 and April 2020 are discussed on both seasonal and diurnal scales.
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