A new ground-based differential absorption sunphotometer for measuring atmospheric columnar CO2 and preliminary applications

Yisong Xie; Zhengqiang Li; Xingying Zhang; Hua Xu; Donghui Li; Kaitao Li

doi:10.1117/12.2199379

8 October 2015 A new ground-based differential absorption sunphotometer for measuring atmospheric columnar CO₂ and preliminary applications

Yisong Xie, Zhengqiang Li, Xingying Zhang, Hua Xu, Donghui Li, Kaitao Li

Author Affiliations +

Proceedings Volume 9678, AOPC 2015: Telescope and Space Optical Instrumentation; 96780M (2015) https://doi.org/10.1117/12.2199379
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

Carbon dioxide is commonly considered as the most important greenhouse gas. Ground-based remote sensing technology of acquiring CO₂ columnar concentration is needed to provide validation for spaceborne CO₂ products. A new groundbased sunphotometer prototype for remotely measuring atmospheric CO₂ is introduced in this paper, which is designed to be robust, portable, automatic and suitable for field observation. A simple quantity, Differential Absorption Index (DAI) related to CO₂ optical depth, is proposed to derive the columnar CO₂ information based on the differential absorption principle around 1.57 micron. Another sun/sky radiometer CE318, is used to provide correction parameters of aerosol extinction and water vapor absorption. A cloud screening method based on the measurement stability is developed. A systematic error assessment of the prototype and DAI is also performed. We collect two-year DAI observation from 2010 to 2012 in Beijing, analyze the DAI seasonal variation and find that the daily average DAI decreases in growing season and reaches to a minimum on August, while increases after that until January of the next year, when DAI reaches its highest peak, showing generally the seasonal cycle of CO₂. We also investigate the seasonal differences of DAI variation and attribute the tendencies of high in the morning and evening while low in the noon to photosynthesis efficiency variation of vegetation and anthropogenic emissions. Preliminary comparison between DAI and model simulated XCO₂ (Carbon Tracker 2011) is conducted, showing that DAI roughly reveals some temporal characteristics of CO₂ when using the average of multiple measurements.

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Yisong Xie, Zhengqiang Li, Xingying Zhang, Hua Xu, Donghui Li, and Kaitao Li "A new ground-based differential absorption sunphotometer for measuring atmospheric columnar CO₂ and preliminary applications", Proc. SPIE 9678, AOPC 2015: Telescope and Space Optical Instrumentation, 96780M (8 October 2015); https://doi.org/10.1117/12.2199379

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KEYWORDS

Carbon dioxide

Absorption

Prototyping

Aerosols

Atmospheric optics

Clouds

Remote sensing

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