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| A balloon-borne sampler system based on the pressure gradient for vertical profile measurements of CO2 |
| LIANG Miao1, FANG Shuang-xi1, LIU Yi2, YAO Bo1, WANG Yong2, MA Qian-li3, YI You2, GUO Min-rui4 |
1. Meteorological Observation Centre, China Meteorological Administration, Beijing 100081, China;
2. Key Laboratory for Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;
3. Zhejiang Lin'an Regional Atmosphere Watch Station, Lin'an 311307, China;
4. College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China |
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Abstract A balloon-borne sampling system for vertical profile of atmospheric CO2 from the surface to 25 km was developed and field-tested. The sampler is deployed on a stratospheric balloon and relies on passively collecting air using the atmospheric pressure gradient during descent. The atmospheric sample through continuous sampling is measured by a cavity ring-down spectrometer (CRDS) for CO2 upon recovery. Field campaigns were conducted for the first time on June 13th and 14th, 2018 at Xilinhaote Observatory. Measurements of CO2 mole fractions in laboratory tests indicated a repeatability of 0.08×10-6 and bias to better than 0.06×10-6 (1σ) for CO2 under various conditions. The vertical resolution with our configuration was determined to be 580m up to 10km and better than 2.0km up to 20km respectively according to the molecular diffusion of the sample. The system provides an in situ method of greenhouse gas measurements for validation of satellite data and estimation of regional flux.
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Received: 24 January 2019
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