2012
DOI: 10.5194/acp-12-8285-2012
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Measurements of ambient HONO concentrations and vertical HONO flux above a northern Michigan forest canopy

Abstract: Abstract. Systems have been developed and deployed at a North Michigan forested site to measure ambient HONO and vertical HONO flux. The modified HONO measurement technique is based on aqueous scrubbing of HONO using a coil sampler, followed by azo dye derivatization and detection using a long-path absorption photometer (LPAP). A Na 2 CO 3 -coated denuder is used to generate "zero HONO" air for background correction. The lower detection limit of the method, defined by 3 times of the standard deviation of the s… Show more

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Cited by 52 publications
(35 citation statements)
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“…However, in contrast to nighttime conditions, the HONO/NO x ratio during daytime is independent of HONO and NO x mixing ratios while it has a light dependency (given by j (NO 2 ), though with a low correlation coefficient (R 2 = 0.23). These results are in agreement with Zhang et al (2012), who showed that the daytime HONO flux does not correlate significantly with measured NO x mixing ratios, suggesting that under these conditions NO x is not an important precursor of HONO daytime formation. In addition, using the Community Multiscale Air Quality (CMAQ) model, Czader et al (2012) demonstrated that photochemical HONO formation can be a strong source during daytime, which directly impacts HO x and ozone levels.…”
Section: Daytime Hono Mixing Ratiosupporting
confidence: 82%
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“…However, in contrast to nighttime conditions, the HONO/NO x ratio during daytime is independent of HONO and NO x mixing ratios while it has a light dependency (given by j (NO 2 ), though with a low correlation coefficient (R 2 = 0.23). These results are in agreement with Zhang et al (2012), who showed that the daytime HONO flux does not correlate significantly with measured NO x mixing ratios, suggesting that under these conditions NO x is not an important precursor of HONO daytime formation. In addition, using the Community Multiscale Air Quality (CMAQ) model, Czader et al (2012) demonstrated that photochemical HONO formation can be a strong source during daytime, which directly impacts HO x and ozone levels.…”
Section: Daytime Hono Mixing Ratiosupporting
confidence: 82%
“…It is worth mentioning that HONO measurements under very clean conditions, using wet-chemical techniques (other than LOPAP) have been reported to be biased by uncorrected interferences leading to artificially high HONO/NO x ratios Kleffmann and Wiesen, 2008;Su et al, 2008;Lu et al, 2010;Villena et al, 2011b;Zhang et al, 2012). Recent studies acknowledged this problem and corrected for these interferences (e.g., Su et al, 2008) or modified the technique to minimize them (e.g., Ren et al, 2010;Zhang et al, 2012). Under high NO x polluted conditions this problem is less pronounced (e.g., Kleffmann et al, 2006;Kleffmann and Wiesen, 2008).…”
Section: Y F Elshorbany Et Al: Impact Of Hono On Global Atmospherimentioning
confidence: 99%
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“…During MCMA-2006, HONO was measured using LP-DOAS (Dusanter et al, 2009 and references therein), which selectively detects HONO based on it specific UV absorption, thus free of sampling artefacts and chemical interferences (Platt and Perner, 1980). During the New York campaign (Ren et al, 2003) HONO was measured by aqueousphase scrubbing and high performance liquid chromatography (HPLC) analysis (Huang et al, 2002), which has been used (also in a modified form) in several field measurement campaigns (e.g., Zhou et al, 2002;Ren et al, 2010;Zhang et al, 2012). It is worth mentioning that HONO measurements under very clean conditions, using wet-chemical techniques (other than LOPAP) have been reported to be biased by uncorrected interferences leading to artificially high HONO/NO x ratios (Kleffmann et al, 2006;Kleffmann and Wiesen, 2008;Su et al, 2008;Lu et al, 2010;Villena et al, 2011b;Zhang et al, 2012).…”
Section: Hono Diurnal Profilementioning
confidence: 99%