The ν4 bands at 11 µm: linelists for the Trans- and Cis- conformer forms of nitrous acid (HONO) in the 2019 version of the GEISA database

Armante, R.; Perrin, A.; Tchana, F. Kwabia; Manceron, L.

doi:10.1080/00268976.2021.1951860

Cited by 7 publications

(9 citation statements)

References 51 publications

(92 reference statements)

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“…1 was generated with the line-by-line radiative transfer model Atmosphit (Coheur et al, 2005). Despite ongoing efforts to provide line positions, intensities and shape parameters of HONO in the thermal infrared (Armante et al, 2021;Tchana Betnga et al, 2023), spectroscopically resolved parameters are not yet available for all the absorption bands. Therefore, we used the cross sections of HONO from the Pacific Northwest National Laboratory (PNNL) infrared database (Sharpe et al, 2004) to ensure consistency within the different bands.…”

Section: Detection Methodsmentioning

confidence: 99%

Pyrogenic HONO seen from space: insights from global IASI observations

Franco,

Clarisse,

Theys

et al. 2023

Preprint

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Abstract. Nitrous acid (HONO) is a key atmospheric component, acting as a major source of the hydroxyl radical (OH), the primary oxidant in the Earth's atmosphere. However, understanding its spatial and temporal variability remains a significant challenge. Recent TROPOMI/S5P UV-Vis measurements of fresh fire plumes shed light on the impact of global pyrogenic HONO emissions. Here, we leverage IASI/Metop's global infrared satellite measurements, complementing midday TROPOMI observations with morning and evening overpasses, to detect and retrieve pyrogenic HONO in 2007–2023. Employing a sensitive detection method, we identify HONO enhancements within concentrated fire plumes worldwide. Most detections are in the North Hemisphere mid and high latitudes, where intense wildfires and high injection heights favour HONO detection. IASI's nighttime measurements yield tenfold more HONO detections than daytime, emphasizing HONO's extended lifetime in the absence of photolysis during the night. The annual detection count increases by at least 3–4 times throughout the IASI time series, mirroring the recent surge in intense wildfires at these latitudes. Additionally, we employ a neural network-based algorithm for retrieving pyrogenic HONO total columns from IASI and compare them with TROPOMI in the same fire plumes. The results demonstrate TROPOMI's efficacy in capturing HONO enhancements in smaller fire plumes and in proximity to fire sources, while IASI's morning and evening overpasses enable HONO measurements further downwind, highlighting the survival of HONO or its secondary formation along long-range transport in smoke plumes.

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Section: Detection Methodsmentioning

confidence: 99%

Pyrogenic HONO seen from space: insights from global IASI observations

Franco,

Clarisse,

Theys

et al. 2023

Preprint

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“…We use the spectral window between 785 and 795 cm −1 for HONO detection and retrievals (Figure 1). The spectroscopic parameters for HONO originate from a preliminary version of the linelist for the ν 4 bands of the HONO Trans-and Cis-conformers that is now available in the GEISA database [14,31]. The selected 785-795 cm −1 microwindow corresponds to the HONO trans-ν 4 band, where the line intensities are about 12% larger than in [14].…”

Section: Hono Spectral Ratio and Retrieval Methodsmentioning

confidence: 99%

“…However, despite aircraft and ground-based measurements being made during campaigns, e.g., [6,9,10], HONO distribution is not well-known, especially in the free troposphere, e.g., [11], compared to the near surface. Satellite detections have been reported for the IASI instrument in Australian fires in 2009 and 2019 [12,13] and an estimation of HONO volume mixing ratio (vmr) in the 2009 fire plume is provided over sea by [14]. Recently, TROPOMI has shown capabilities to cartography the HONO emitted by fires [15].…”

Section: Introductionmentioning

confidence: 99%

24 h Evolution of an Exceptional HONO Plume Emitted by the Record-Breaking 2019/2020 Australian Wildfire Tracked from Space

et al. 2022

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Megafires occurred in Australia during the 2019/2020 bushfire season, leading to enhanced concentrations of many tropospheric pollutants. Here, we report on a fire plume with unusually high and persistent nitrous acid (HONO) levels that we could track during one day at free tropospheric levels over the Tasman Sea on 4 January 2020 using IASI and CrIS satellite observations. HONO concentrations up to about 25 ppb were retrieved during nighttime. Persistent HONO concentrations (>10 ppb) were still observed at sunrise, likely due to large aerosol concentrations within the plume, preventing HONO photodissociation. In addition, comparison with carbon monoxide (CO) measurements suggest a secondary production during the plume transport. Model simulations confirm that the plume is transported in the lower free troposphere with concentrations as high as 30 ppb at about 4 km. However, many uncertainties and unknowns remain in the plume aerosol load and in the chemical processes which may explain the model inability to reproduce elevated HONO concentrations at sunrise.

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“…Using spectroscopic data collected in the literature, a linelist of positions and intensities has been generated for the 11 µm region of HONO [132] which correspond to the 6 bands located at 790.117 and 851.943 cm -1 for the Cis-and Trans-isomers, respectively.…”

Section: Hono (New Molecule 53)mentioning

confidence: 99%

“…The problem of the uncertainties associated to these intensities was discussed in details in Ref. [132]. Indeed, in usual laboratory conditions nitrous acid exists only in the form of an equilibrium mixture with other species like NO, NO2 and H2O, together with smaller quantities of N2O3, N2O5, and HNO3 [135].…”

Section: Hono (New Molecule 53)mentioning

confidence: 99%