Nitrate chemistry in the northeast US – Part 2: Oxygen isotopes reveal differences in particulate and gas-phase formation

Kim, Heejeong; Walters, Wendell W.; Bekker, Claire; Murray, Lee T.; Hastings, Meredith G.

doi:https://doi.org/10.5194/acp-23-4203-2023

Articles | Volume 23, issue 7

https://doi.org/10.5194/acp-23-4203-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-23-4203-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 23, issue 7

Research article

|

06 Apr 2023

Research article |

| 06 Apr 2023

Nitrate chemistry in the northeast US – Part 2: Oxygen isotopes reveal differences in particulate and gas-phase formation

Heejeong Kim, Wendell W. Walters, Claire Bekker, Lee T. Murray, and Meredith G. Hastings

Data sets

Data for "Nitrate Chemistry in the Northeast US Part 1 & Part 2" Wendell Walters https://doi.org/10.7910/DVN/X6BB1I

Short summary

Atmospheric nitrate has an important impact on human and ecosystem health. We evaluated atmospheric nitrate formation pathways in the northeastern US utilizing oxygen isotope compositions, which indicated a significant difference between the phases of nitrate (i.e., gas vs. particle). Comparing the observations with model simulations indicated that N₂O₅ hydrolysis chemistry was overpredicted. Our study has important implications for improving atmospheric chemistry model representation.