Glyoxal in a nocturnal atmosphere measured by incoherent broadband cavity-enhanced absorption spectroscopy
| Autor: | Deepa Viswanath, Anoop Pakkattil, Aiswarya Saseendran, Ravi Varma, Kuttoth Suhail, Arun Ramachandran, Shebin John |
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| Rok vydání: | 2021 |
| Předmět: |
Atmospheric Science
Materials science Spectrometer business.industry Health Toxicology and Mutagenesis Management Monitoring Policy and Law Pollution Plume law.invention Atmosphere chemistry.chemical_compound Optics chemistry law Optical cavity Glyoxal Nitrogen dioxide Spectroscopy Absorption (electromagnetic radiation) business |
| Zdroj: | Air Quality, Atmosphere & Health. 15:515-520 |
| ISSN: | 1873-9326 1873-9318 |
| DOI: | 10.1007/s11869-021-01131-6 |
| Popis: | An incoherent broadband cavity-enhanced absorption spectrometer in open-path configuration (OP-IBBCEAS) was developed to measure glyoxal (CHOCHO), in the nocturnal atmosphere at the medium-sized coastal city of Calicut, India. The instrument mainly consists of a broadband light source, an open optical cavity formed by two high reflective mirrors, and a CCD array spectrometer. The instrument was operated in a continuous visible spectral range of 415–460 nm, and we report preliminary result from a measurement campaign in the autumn of 2018. Measurements were made between 10 PM and 6 AM, and focus was when diesel vehicles were found idling along about half a km stretch during 3–6 AM, while the loading/unloading of vegetables at sorting facility happens. Spectral measurements were averaged over 10 min, observed a passing plume of glyoxal that lasted ~ 1 h with a maximum concentration of ~ 16.9 ± 2.18 ppb. Transient plumes of another urban pollutant, nitrogen dioxide (NO2), were also observed simultaneously that recorded a concentration of ~ 74 ± 5.5 ppb at its maximum. |
| Databáze: | OpenAIRE |
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