Evaluation of and updates to the oxidized reactive nitrogen gaseous dry-deposition parameterization from the GEOS-Chem model, including a pathway for ground surface NO<sub>2</sub> hydrolysis

Boys, Brian L.; Martin, Randall V.; VandenBoer, Trevor C.

doi:10.5194/acp-25-17553-2025

Articles | Volume 25, issue 23

https://doi.org/10.5194/acp-25-17553-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-25-17553-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 23

Research article

|

04 Dec 2025

Research article |

| 04 Dec 2025

Evaluation of and updates to the oxidized reactive nitrogen gaseous dry-deposition parameterization from the GEOS-Chem model, including a pathway for ground surface NO₂ hydrolysis

Brian L. Boys, Randall V. Martin, and Trevor C. VandenBoer

Supplement

https://doi.org/10.5194/acp-25-17553-2025-supplement

Data sets

Dry deposition module source code from GEOS-Chem version 10-01 B. L. Boys https://doi.org/10.5281/zenodo.13892258

Biomass Inventories at Harvard Forest EMS Tower since 1993 ver 42 J. Matthes et al. https://doi.org/10.6073/pasta/0292c5bdb53f80dffee596295cb080ca

Canopy-Atmosphere Exchange of Carbon, Water and Energy at Harvard Forest EMS Tower since 1991 ver 36 W. Munger and S. Wofsy https://doi.org/10.6073/pasta/56c6fe02a07e8a8aaff44a43a9d9a6a5

Concentrations and Surface Exchange of Air Pollutants at Harvard Forest EMS Tower since 1990 ver 29 W. Munger and S. Wofsy https://doi.org/10.6073/pasta/7415aa04ce4ad8e864aad5e1721b33d3

Radiation Measurements at Harvard Forest EMS Tower 1991-2007 ver 23 D. Fitzjarrald and R. Sakai https://doi.org/10.6073/pasta/f3adbe87e7e506c720d0d9ee91d2b6c4

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Short summary

A widely used dry-deposition parameterization for NO₂ has been updated to include a well-known heterogeneous hydrolysis reaction on deposition surfaces. This update addresses a large low bias of -80 % in simulated NO₂ nocturnal deposition velocities evaluated against long-term eddy covariance flux observations over Harvard Forest. We highlight the importance of canopy surface area effects as well as soil NO emissions in formulating and evaluating NO₂ dry-deposition parameterizations.

Evaluation of and updates to the oxidized reactive nitrogen gaseous dry-deposition parameterization from the GEOS-Chem model, including a pathway for ground surface NO2 hydrolysis

Supplement

Data sets

Evaluation of and updates to the oxidized reactive nitrogen gaseous dry-deposition parameterization from the GEOS-Chem model, including a pathway for ground surface NO₂ hydrolysis