Tropospheric HONO distribution and chemistry in the southeastern US. Ye, C., Zhou, X., Pu, D., Stutz, J., Festa, J., Spolaor, M., Tsai, C., Cantrell, C., Mauldin, R., L., Weinheimer, A., Hornbrook, R., S., Apel, E., C., Guenther, A., Kaser, L., Yuan, B., Karl, T., Haggerty, J., Hall, S., Ullmann, K., Smith, J., & Ortega, J. Atmospheric Chemistry and Physics, 18(12):9107-9120, 2018.
abstract   bibtex   
Here we report the measurement results of nitrous acid (HONO) and a suite of relevant parameters on the NCAR C-130 research aircraft in the southeastern US during the NOMADSS 2013 summer field study. The daytime HONO concentration ranged from low parts per trillion by volume (pptv) in the free troposphere (FT) to mostly within 5-15 pptv in the background planetary boundary layer (PBL). There was no discernible vertical HONO gradient above the lower flight altitude of 300 m in the PBL, and the transport of ground surface HONO was not found to be a significant contributor to the tropospheric HONO budget. The total in situ HONO source mean (±1 SD) was calculated as 53 (±21) pptv h-1 during the day. The upper-limit contribution from NO-related reactions was 10 (±5) pptv h-1, and the contribution from photolysis of particulate nitrate (pNO3) was 38 (±23) pptv h-1, based on the measured pNO3 concentrations and the median pNO3 photolysis rate constant of 2.0 × 10-4 s-1 determined in the laboratory using ambient aerosol samples. The photolysis of HONO contributed to less than 10 % of the primary OH source. However, a recycling NOx source via pNO3 photolysis was equivalent to ~ 2.3 × 10-6 mol m-2 h-1 in the air column within the PBL, a considerable supplementary NOx source in the low-NOx background area. Up to several tens of parts per trillion by volume of HONO were observed in power plant and urban plumes during the day, mostly produced in situ from precursors including NOx and pNO3. Finally, there was no observable accumulation of HONO in the nocturnal residual layer and the nocturnal FT in the background southeastern US, with an increase in the HONO / NOx ratio of ≤ 3 × 10-4 h-1 after sunset.
@article{
 title = {Tropospheric HONO distribution and chemistry in the southeastern US},
 type = {article},
 year = {2018},
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 pages = {9107-9120},
 volume = {18},
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 abstract = {Here we report the measurement results of nitrous acid (HONO) and a suite of relevant parameters on the NCAR C-130 research aircraft in the southeastern US during the NOMADSS 2013 summer field study. The daytime HONO concentration ranged from low parts per trillion by volume (pptv) in the free troposphere (FT) to mostly within 5-15 pptv in the background planetary boundary layer (PBL). There was no discernible vertical HONO gradient above the lower flight altitude of 300 m in the PBL, and the transport of ground surface HONO was not found to be a significant contributor to the tropospheric HONO budget. The total in situ HONO source mean (±1 SD) was calculated as 53 (±21) pptv h-1 during the day. The upper-limit contribution from NO-related reactions was 10 (±5) pptv h-1, and the contribution from photolysis of particulate nitrate (pNO3) was 38 (±23) pptv h-1, based on the measured pNO3 concentrations and the median pNO3 photolysis rate constant of 2.0 × 10-4 s-1 determined in the laboratory using ambient aerosol samples. The photolysis of HONO contributed to less than 10 % of the primary OH source. However, a recycling NOx source via pNO3 photolysis was equivalent to ~ 2.3 × 10-6 mol m-2 h-1 in the air column within the PBL, a considerable supplementary NOx source in the low-NOx background area. Up to several tens of parts per trillion by volume of HONO were observed in power plant and urban plumes during the day, mostly produced in situ from precursors including NOx and pNO3. Finally, there was no observable accumulation of HONO in the nocturnal residual layer and the nocturnal FT in the background southeastern US, with an increase in the HONO / NOx ratio of ≤ 3 × 10-4 h-1 after sunset.},
 bibtype = {article},
 author = {Ye, Chunxiang and Zhou, Xianliang and Pu, Dennis and Stutz, Jochen and Festa, James and Spolaor, Max and Tsai, Catalina and Cantrell, Christopher and Mauldin, Roy L. and Weinheimer, Andrew and Hornbrook, Rebecca S. and Apel, Eric C. and Guenther, Alex and Kaser, Lisa and Yuan, Bin and Karl, Thomas and Haggerty, Julie and Hall, Samuel and Ullmann, Kirk and Smith, James and Ortega, John},
 journal = {Atmospheric Chemistry and Physics},
 number = {12}
}
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