Preprints
https://doi.org/10.5194/amt-2021-19
https://doi.org/10.5194/amt-2021-19

  16 Feb 2021

16 Feb 2021

Review status: this preprint is currently under review for the journal AMT.

Intercomparison of IBBCEAS, NitroMAC and FTIR for HONO, NO2 and HCHO measurements during the reaction of NO2 with H2O vapor in the atmospheric simulation chamber of CESAM

Hongming Yi1,a, Mathieu Cazaunau2, Aline Gratien2, Vincent Michoud2, Edouard Pangui2, Jean-Francois Doussin2, and Weidong Chen1 Hongming Yi et al.
  • 1Laboratoire de Physicochimie de l’Atmosphère, Université du Littoral Côté d’Opale, 59140 Dunkerque, France
  • 2Laboratoire Interuniversitaire des Systèmes Atmosphériques, CNRS UMR7583, Universités Paris-Est-Créteil et Université de Paris Diderot, 94010 Créteil, France
  • anow at: Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, USA

Abstract. We report on applications of ultraviolet light emitted diode based incoherent broadband cavity enhanced absorption spectroscopy (UV-LED-IBBCEAS) technique for optical monitoring of HONO, NO2 and CH2O in a simulation chamber. Performance intercomparison of the UV-LED-IBBCEAS with a wet chemistry-based NitroMAC sensor and a FTIR spectrometer has been carried out on real time simultaneous measurement of HONO, NO2 and CH2O concentrations during the reaction of NO2 with H2O vapor in the CESAM atmospheric simulation chamber. 1-σ (SNR = 1) detection limits of 200 pptv for NO2, 100 pptv for HONO and 5 ppbv for CH2O over 120 s were found for the UV-LED-IBBCEAS measurement. On the contrary to many set-ups where cavities are installed outside the simulation chamber, we describe here an original in-situ permanent installation. The intercomparison results demonstrate that IBBCEAS is a very well suitable technique for in situ simultaneous measurements of multiple chemically reactive species with high sensitivity and high precision even if the absorption bands of these species are overlapped. It offers excellent capacity to non-invasive optical monitoring of chemical reaction without any perturbation. For the application to simulation chamber, it has the advantage to provide a spatially integrated measurement across the reactor and hence to avoid point sampling related artefact.

Hongming Yi et al.

Status: open (until 13 Apr 2021)

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Hongming Yi et al.

Hongming Yi et al.

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Short summary
HONO, NO2 plays a crucial role in the atmospheric oxidation capacity that affects the regional air quality and global climate. Accurate measurements of HONO are challenging due to the drawback of existing detection methods. Calibration-free, high-sensitivity, direct, simultaneous NO2, HONO and CH2O measurement with UV-IBBCEAS provide accurate and fast quantitative analysis of their concentration variation within their lifetime by intercomparison with NOx analyzer, FT-IR and NitroMAC sensor.