The Berkeley Environmental Air-quality and CO2 Network: field calibrations of sensor temperature dependence and assessment of network scale CO2 accuracy

Autor: E. R. Delaria, J. Kim, H. L. Fitzmaurice, C. Newman, P. J. Wooldridge, K. Worthington, R. C. Cohen
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Atmospheric Measurement Techniques, Vol 14, Pp 5487-5500 (2021)
Druh dokumentu: article
ISSN: 1867-1381
1867-8548
DOI: 10.5194/amt-14-5487-2021
Popis: The majority of global anthropogenic CO2 emissions originate in cities. We have proposed that dense networks are a strategy for tracking changes to the processes contributing to urban CO2 emissions and suggested that a network with ∼ 2 km measurement spacing and ∼ 1 ppm node-to-node precision would be effective at constraining point, line, and area sources within cities. Here, we report on an assessment of the accuracy of the Berkeley Environmental Air-quality and CO2 Network (BEACO2N) CO2 measurements over several years of deployment. We describe a new procedure for improving network accuracy that accounts for and corrects the temperature-dependent zero offset of the Vaisala CarboCap GMP343 CO2 sensors used. With this correction we show that a total error of 1.6 ppm or less can be achieved for networks that have a calibrated reference location and 3.6 ppm for networks without a calibrated reference.
Databáze: Directory of Open Access Journals
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