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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-363
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-363
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 14 Oct 2019

Submitted as: research article | 14 Oct 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

In situ measurement of CO2 and CH4 from aircraft over northeast China and comparison with OCO-2 data

Xiaoyu Sun1,2, Minzheng Duan1,2,3, Yang Gao4, Rui Han2,5, Denghui Ji1,2, Wenxing Zhang1, Nong Chen6, Xiangao Xia1,2, Hailei Liu3, and Yanfeng Huo7 Xiaoyu Sun et al.
  • 1LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029 Beijing, China
  • 2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
  • 3Chengdu University of Information Technology, Chengdu, 610225, China
  • 4China Meteorological Administration, Beijing, 100089, China
  • 5ICCES, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
  • 6Heilongjiang Meteorological Bureau, Harbin, 150001, China
  • 7Anhui Meteorology Service, Hefei, 230061, China

Abstract. Several satellites have been launched to monitor the increasing concentrations of greenhouse gases, especially CO2 and CH4 in the atmosphere, through back-scattered hyperspectral radiance in the shortwave infrared (SWIR) band. The vertical profiles of greenhouse gases and aerosol could strongly affect the results from these instruments. To investigate the effects of the vertical distribution of CO2 on uncertainty in SWIR satellite retrieval results, we conducted observations of the vertical profiles of CO2, CH4, and aerosol particles at 0.6–7 km above sea level using a Beechcraft King Air 350ER in Jiansanjiang (46.77° N, 131.99° E), Heilongjiang province, Northeast China, on August 7–12, 2018. The profiles from this aircraft captured a decrease in CO2 from 2 km to the minimum altitude due to uptake from vegetation at the surface in summer. CH4 measurements showed an average 0.5 ppm increase from 2.0 to 0.6 km, which may result from emissions from the large area of paddy fields below, and a constant mole fraction between 1.951 and 1.976 ppm was recorded at 2 km and above. Comparison of CO2 profiles from a new version of the carbon cycle data assimilation system Tan-Tracker (v1), retrievals from OCO-2 and aircraft measurements was conducted. The results from OCO-2 and the assimilation model system Tan-Tracker captured the vertical structure of CO2 above 3 km, whereas below 3 km, the values from OCO-2 and Tan-Tracker model were lower than those from in situ measurements. Column-averaged CO2 volume mixing ratios calculated from in situ measurements showed biases of −2.39 ± 2.02 ppm and −0.61 ± 0.49 % compared to OCO-2 retrievals.

Xiaoyu Sun et al.
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Short summary
The accurate measurement of greenhouse gases and its vertical distribution in the atmosphere is significant to the study of climate change and satellite remote sensing. The profiles of carbon dioxide and methane between 0.6∼7 km was measured by aircraft King Air 350ER in Jiansanjiang, Northeast China, on August 7–11, 2018. The profiles show strong variation with the altitude and time, so the vertical structure of gases should be taken into account in the current satellite retrieval algorithm.
The accurate measurement of greenhouse gases and its vertical distribution in the atmosphere is...
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