[A-AS11] Atmospheric Chemistry

[AAS11-P27] Evaluation of a domestically produced low-cost carbon dioxide sensor toward ground-based measurements in urban atmosphere

*Takuma Miyakawa¹, Naveen Chandra¹, Prabir Patra¹, Shinichi Koyama², Masahiro Yamaguchi¹, Yugo Kanaya¹ (1.Japan Agency for Marine-Earth Science and Technology, 2.Murata Keisokuki Service Co., Ltd.)

Keywords:GHGs, Carbon dioxide, Low cost sensor, Non-dispersive infrared absorption

Carbon dioxide (CO₂), a major greenhouse gas (GHG), is considered a primary driver of global warming since the Industrial Revolution. Under the Paris Agreement, which guides global climate action beyond 2020, ambitious goals have been set to achieve net-zero GHG emissions. At the regional scale, there is a growing need for rapid and efficient methods to monitor and evaluate emissions associated with human activities. Consequently, research efforts have intensified in various fields, including satellite observations (e.g., Yamaguchi et al., 2024) and the integration of ground-based measurements with numerical model data assimilation (e.g., Ohyama et al., 2023). High-density observation networks (e.g., Turner et al., 2016) are also considered a promising approach; however, the accuracy of measurement devices and the cost of deployment and maintenance remain significant challenges. Here, we focus on a domestically produced low-cost CO₂ sensor manufactured by Murata Manufacturing Co., Ltd., which has been used for CO₂ monitoring in building management. We have investigated its feasibility for atmospheric measurements. This sensor employs a single light source, a single optical path, and a single detector, and measures infrared absorption at two wavelengths. We have conducted intercomparison experiments using prototype measurement units incorporating this sensor alongside reference instruments (LI-850 and LI-7810, manufactured by LICOR) in 2024-2025. These experiments revealed dependencies on environmental variables such as temperature, humidity, and pressure, which are crucial for real-world atmospheric applications. In this presentation, we will discuss the evaluation results obtained and explore potential future applications of this sensor.