Quantification of the unknown HONO daytime source and its relation to NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;

Sörgel, Matthias; Regelin, E.; Bozem, Heiko; Diesch, J.-M.; Drewnick, Frank; Fischer, H.; Harder, Hartwig; Held, Andreas; Hosaynali-Beygi, Z.; Martínez, Mònica; Zetzsch, Cornelius

doi:10.5194/acpd-11-15119-2011

Cited by 33 publications

(69 citation statements)

References 94 publications

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“…From 12:00 UTC onward, photolysis of O 3 becomes the dominant source, as HONO concentration decays. These results are comparable to those calculated by Sörgel et al (2011) from the DOMINO measurement campaign in El Arenosillo. There, they quantified the integrated contribution of HONO to OH release being 20% higher than the O 1 D reaction with water vapor.…”

Section: Hono Contribution To Oh Release Effects On Secondary Pollutsupporting

confidence: 79%

“…Predicted HONO levels by WRF-ARW/HERMES/CMAQ are compared to observations from the DOMINO campaign in El Arenosillo air quality station (Sörgel et al, 2011). The station is located in a forested area mainly composed of pine trees that can be affected by industrial plumes from a refinery and a power plant located 20 km away in the northwest direction, depending on the meteorological conditions.…”

Section: Assessment Of Different Hono Sourcesmentioning

confidence: 99%

“…Here, the WRF-ARW/HERMES/CMAQ modeling system, which is the basis of the CALIOPE system (Baldasano et al, 2008a;Baldasano et al, 2011;Pay et al, 2010Pay et al, , 2012, is used to test the contribution of different sources to HONO levels in Spain during November 24e27, 2008. Model predictions are compared to HONO observations from the DOMINO campaign performed in El Arenosillo station (Southern Spain) for the analyzed period (Sörgel et al, 2011). Previous modeling studies have included heterogeneous HONO production on ground surfaces as simple parameterizations considering constant surface to volume ratios (Vogel et al, 2003;Li et al, 2010), or neglecting the relative humidity influence on kinetics (Sarwar et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…A recently conducted field campaign in Southern Spain (Sörgel et al, 2011), DOMINO, identified a strong diurnal source of HONO. Sörgel and coworkers showed that known photoenhanced HONO sources, such as NO 2 reduction on aerosols and NO 2 * reaction with water, contribute up to 10% to HONO observed levels, concluding that there must be an additional unidentified diurnal HONO source.…”

Section: Introductionmentioning

confidence: 99%

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Impact of HONO sources on the performance of mesoscale air quality models

Gonçalves

Dabdub

Chang

et al. 2012

Atmospheric Environment

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a b s t r a c tNitrous acid (HONO) photolysis constitutes a primary source of OH in the early morning, which leads to changes in model gas-phase and particulate matter concentrations. However, state-of-the-art models of chemical mechanisms share a common representation of gas-phase chemistry leading to HONO that fails in reproducing the observed profiles. Hence, there is a growing interest in improving the definition of additional HONO sources within air quality models, i.e. direct emissions or heterogeneous reactions. In order to test their feasibility under atmospheric conditions, the WRF-ARW/HERMES/CMAQ modeling system is applied with high horizontal resolution (4 Â 4 km 2 ) to Spain for November 24e27, 2008. HONO modeled sources include: (1) direct emissions from on-road transport; NO 2 hydrolysis on aerosol and ground surfaces, the latter with (2) kinetics depending exclusively on available surfaces for reaction and (3) refined kinetics considering also relative humidity dependence; and (4) photoenhanced NO 2 reduction on ground surfaces. The DOMINO measurement campaign performed in El Arenosillo (Southern Spain) provides valuable HONO observations. Modeled HONO results are consistently below observations, even when the most effective scenario is assessed, corresponding to contributions of direct emissions and NO 2 hydrolysis with the simplest kinetics parameterization. With the additional sources of HONO, PM 2.5 predictions can be up to 14% larger in urban areas. Quantified impacts on secondary pollutants have to be taken as a low threshold, due to the proven underestimation of HONO levels. It is fundamental to improve HONO sources definition within air quality models, both for the scientific community and decision makers.

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Section: Hono Contribution To Oh Release Effects On Secondary Pollutsupporting

confidence: 79%

Section: Assessment Of Different Hono Sourcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of HONO sources on the performance of mesoscale air quality models

Gonçalves

Dabdub

Chang

et al. 2012

Atmospheric Environment

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“…) that has proven difficult to explain through known HONO (g) production mechanisms [Amoroso et al, 2008;Elshorbany et al, 2009;Elshorbany et al, 2012;Li et al, 2012;Ren et al, 2013;Sörgel et al, 2011b].…”

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confidence: 99%

Evidence for a nitrous acid (HONO) reservoir at the ground surface in Bakersfield, CA, during CalNex 2010

et al. 2014

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Measurements of HONO (g) were validated to be free of known interferences for wet chemical instrumentation. The accumulation of nitrite into particulate matter was found to be enhanced when gaseous mixing ratios of HONO (g) were highest. Reactive uptake of HONO (g) on to lofted dust and the ground surface, forming a reservoir, is a potential mechanism to explain these observations. The AIM-IC HONO (g) measurements were parameterized in a chemical model to calculate the ground surface daytime HONO (g) source strength at 4.5 m above the surface, found to be on the order of 1.27 ppb h À1, to determine the relative importance of a surface reservoir. If all deposited nighttime HONO (g) is reemitted the following day, up to 30% of the daytime HONO (g) source at CalNex-SJV may be accounted for. The observations of HONO (g) and NO 2 À (p) in Bakersfield, during CalNex, suggest a surface sink and source of HONO (g) . Extension of currently accepted unknown daytime HONO (g) source reactions to include a potential surface HONO (g) reservoir should therefore be sound, but quantitation of the relative contributions of each surface source toward daytime HONO (g) production remains to be resolved.

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Understanding the role of the ground surface in HONO vertical structure: High resolution vertical profiles during NACHTT‐11

et al. 2013

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[1] A negative-ion proton-transfer chemical ionization mass spectrometer was deployed on a mobile tower-mounted platform during Nitrogen, Aerosol Composition, and Halogens on a Tall Tower (NACHTT) to measure nitrous acid (HONO) in the winter of 2011. High resolution vertical profiles revealed (i) HONO gradients in nocturnal boundary layers, (ii) ground surface dominates HONO production by heterogeneous uptake of NO 2 , (iii) significant quantities of HONO may be deposited to the ground surface at night, (iv) daytime gradients indicative of ground HONO production or emission, and (v) an estimated surface HONO reservoir comparable or larger than integrated daytime HONO surface production. Nocturnal integrated column observations of HONO and NO 2 allowed direct evaluation of nocturnal ground surface uptake coefficients for these species (γ NO2, surf = 2 × 10 À6 to 1.6 × 10 À5 and γ HONO, surf = 2 × 10 À5 to 2 × 10 À4 ). The quantity of surface-deposited HONO was also modeled, showing that HONO deposited to the surface at night was at least 25%, and likely in excess of 100%, of the calculated unknown daytime HONO source. These results suggest that if nocturnally deposited HONO forms a conservative surface reservoir, which can be released the following day, a significant fraction of the daytime HONO source can be explained for the NACHTT observations. Citation: VandenBoer, T. C., et al. (2013), Understanding the role of the ground surface in HONO vertical structure: High resolution vertical profiles during

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Quantification of the unknown HONO daytime source and its relation to NO<sub>2</sub>

Cited by 33 publications

References 94 publications

Impact of HONO sources on the performance of mesoscale air quality models

Impact of HONO sources on the performance of mesoscale air quality models

Evidence for a nitrous acid (HONO) reservoir at the ground surface in Bakersfield, CA, during CalNex 2010

Understanding the role of the ground surface in HONO vertical structure: High resolution vertical profiles during NACHTT‐11

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