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

T. C. van den Boer; M. Z. Markovic; J. E. Sanders; X. Ren; S. E. Pusede; E. C. Browne; R. C. Cohen; L. Zhan; J. Thomas; W. H. Brune; J. G. Murphy

doi:10.1002/2013JD020971

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

T. C. van den Boer, M. Z. Markovic, J. E. Sanders, X. Ren, S. E. Pusede, E. C. Browne, R. C. Cohen, L. Zhan, J. Thomas, W. H. Brune, J. G. Murphy

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Abstract

Measurements of HONO_(g) and particulate nitrite (NO_{2 (p)}) were made with a modified Ambient Ion Monitor–Ion Chromatography (AIM-IC) instrument during California at the Nexus of Air Quality and Climate 2010 in Bakersfield, CA (CalNex-San Joaquin Valley (SJV)). Observations of gas and particulate matter (PM_2.5) water-soluble composition showed accumulation of both species at night, followed by loss the next day. Intercomparison with a Stripping Coil-UV/Vis Absorption Photometer (SC-AP) demonstrated excellent agreement with the AIM-IC HONO_(g) measurement (slope = 0.957, R² = 0.86), and the particulate nitrite observations 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 h¹, 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 (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.

Original language	English (US)
Pages (from-to)	9093-9106
Number of pages	14
Journal	Journal of Geophysical Research
Volume	119
Issue number	14
DOIs	https://doi.org/10.1002/2013JD020971
State	Published - Jul 27 2014

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Physical and Theoretical Chemistry
Polymers and Plastics
Materials Chemistry

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10.1002/2013JD020971

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@article{764277b85c6e42309a0835ea77629ea0,

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

abstract = "Measurements of HONO(g) and particulate nitrite (NO2 (p)) were made with a modified Ambient Ion Monitor–Ion Chromatography (AIM-IC) instrument during California at the Nexus of Air Quality and Climate 2010 in Bakersfield, CA (CalNex-San Joaquin Valley (SJV)). Observations of gas and particulate matter (PM2.5) water-soluble composition showed accumulation of both species at night, followed by loss the next day. Intercomparison with a Stripping Coil-UV/Vis Absorption Photometer (SC-AP) demonstrated excellent agreement with the AIM-IC HONO(g) measurement (slope = 0.957, R2 = 0.86), and the particulate nitrite observations 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 h1, 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 NO2 (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.",

author = "{van den Boer}, {T. C.} and Markovic, {M. Z.} and Sanders, {J. E.} and X. Ren and Pusede, {S. E.} and Browne, {E. C.} and Cohen, {R. C.} and L. Zhan and J. Thomas and Brune, {W. H.} and Murphy, {J. G.}",

year = "2014",

month = jul,

day = "27",

doi = "10.1002/2013JD020971",

language = "English (US)",

volume = "119",

pages = "9093--9106",

journal = "Journal of Geophysical Research",

issn = "0148-0227",

publisher = "Wiley-Blackwell",

number = "14",

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TY - JOUR

T1 - Evidence for a nitrous acid (HONO) reservoir at the ground surface in Bakersfield, CA, during CalNex 2010

AU - van den Boer, T. C.

AU - Markovic, M. Z.

AU - Sanders, J. E.

AU - Ren, X.

AU - Pusede, S. E.

AU - Browne, E. C.

AU - Cohen, R. C.

AU - Zhan, L.

AU - Thomas, J.

AU - Brune, W. H.

AU - Murphy, J. G.

PY - 2014/7/27

Y1 - 2014/7/27

N2 - Measurements of HONO(g) and particulate nitrite (NO2 (p)) were made with a modified Ambient Ion Monitor–Ion Chromatography (AIM-IC) instrument during California at the Nexus of Air Quality and Climate 2010 in Bakersfield, CA (CalNex-San Joaquin Valley (SJV)). Observations of gas and particulate matter (PM2.5) water-soluble composition showed accumulation of both species at night, followed by loss the next day. Intercomparison with a Stripping Coil-UV/Vis Absorption Photometer (SC-AP) demonstrated excellent agreement with the AIM-IC HONO(g) measurement (slope = 0.957, R2 = 0.86), and the particulate nitrite observations 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 h1, 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 NO2 (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.

AB - Measurements of HONO(g) and particulate nitrite (NO2 (p)) were made with a modified Ambient Ion Monitor–Ion Chromatography (AIM-IC) instrument during California at the Nexus of Air Quality and Climate 2010 in Bakersfield, CA (CalNex-San Joaquin Valley (SJV)). Observations of gas and particulate matter (PM2.5) water-soluble composition showed accumulation of both species at night, followed by loss the next day. Intercomparison with a Stripping Coil-UV/Vis Absorption Photometer (SC-AP) demonstrated excellent agreement with the AIM-IC HONO(g) measurement (slope = 0.957, R2 = 0.86), and the particulate nitrite observations 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 h1, 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 NO2 (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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ER -

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

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