Assessment of Open-path Spectrometer Accuracy at Low Path-integrated Methane Concentrations

Atmosphere

ZacharyJ. DeBruyn¹  Andrew VanderZaag²  Claudia Wagner-Riddle³ 

[1] Former Graduate Student at School of Environmental Sciences, University of Guelph, 50 Stone Road E, Guelph, ON N1G2W1, Canada;Ottawa Research and Development Centre, Science and Technology Branch, Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, ON K1A0C6, Canada;School of Environmental Sciences, University of Guelph, 50 Stone Road E, Guelph, ON N1G2W1, Canada;

关键词: open-path laser;    methane;    path-integrated concentration;    gasfinder3;   

DOI  :  10.3390/atmos11020184

来源: DOAJ

【 摘 要 】

The accurate measurement of greenhouse gas emissions is a challenge for atmospheric science. Long-range open-path sensors are flexible enough to be applied to a variety of complex emission sources, and single devices are often used to measure both high and low path-integrated concentrations. As this technology develops, it is important to examine potential sources of inaccuracy. A GasFinder3 open-path laser was tested with a range of path-integrated concentrations from 11.7 to 182 ppm∙m CH₄ using certified standard gases. The measured path-integrated concentrations had a positive bias which was higher than 10% at low path-integrated concentrations (<50 ppm∙m) with a declining trend expected to be under 2% at 200 ppm∙m. A linear equation was used to correct the measured path-integrated concentrations to fit the expected values. After correction, the average bias was reduced to −0.36% and there was no relationship with path-integrated concentration. A relative bias less than ±3% was achieved above ca. 150 ppm∙m with or without calibration. Measurement campaigns may reduce error by increasing path lengths to maximize path-integrated concentration. When low path-integrated concentrations are expected, calibration over the expected range is beneficial.

【 授权许可】

Unknown