| Autor: |
Suhail, Kuttoth, Pakkattil, Anoop, Ramachandran, Arun, Saseendran, Aiswarya, John, Shebin, Viswanath, Deepa, Varma, Ravi |
| Zdroj: |
Air Quality, Atmosphere & Health; Mar2022, Vol. 15 Issue 3, p515-520, 6p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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