Articles | Volume 19, issue 7
https://doi.org/10.5194/amt-19-2379-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-2379-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 Apr 2026
Research article |
| 10 Apr 2026
| 10 Apr 2026
Modification and validation of a commercial dynamic chamber for reactive nitrogen and greenhouse gas flux measurements
Moxy Shah
Department of Chemistry, York University, Toronto, Ontario, Canada
Kifle Z. Aregahegn
Department of Chemistry, York University, Toronto, Ontario, Canada
Danial Nodeh-Farahani
Department of Chemistry, York University, Toronto, Ontario, Canada
Leigh R. Crilley
Department of Chemistry, York University, Toronto, Ontario, Canada
now at: Atmospheric Services, WSP Australia, Brisbane, QLD, Australia
Tasnia Hasan
Department of Chemistry, York University, Toronto, Ontario, Canada
Yashar Ebrahimi-Iranpour
Department of Chemistry, York University, Toronto, Ontario, Canada
Fahim Sarker
Department of Chemistry, York University, Toronto, Ontario, Canada
Nick Nickerson
Eosense Inc., Dartmouth, Nova Scotia, Canada
Chance Creelman
Eosense Inc., Dartmouth, Nova Scotia, Canada
Sarah Ellis
Eosense Inc., Dartmouth, Nova Scotia, Canada
Alexander Moravek
Department of Chemistry, York University, Toronto, Ontario, Canada
now at: German Environment Agency, Department of Air Quality, Dessau-Rosslau, Germany
Department of Chemistry, York University, Toronto, Ontario, Canada
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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.
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HONO is key to tropospheric chemistry. Observations show high HONO concentrations in remote air, possibly explained by nitrate aerosol photolysis. We use observations to parameterize nitrate photolysis, evaluating simulated HONO against observations from multiple sources. We show improved agreement with observed HONO, but overestimates in NOx and O3, beyond observational constraints. This implies uncertainties in the NOx budget and our understanding of atmospheric chemistry.
Afshan Khaleghi, Mathias Göckede, Nicholas Nickerson, and David Risk
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Alessia A. Colussi, Daniel Persaud, Melodie Lao, Bryan K. Place, Rachel F. Hems, Susan E. Ziegler, Kate A. Edwards, Cora J. Young, and Trevor C. VandenBoer
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A new modular and affordable instrument was developed to automatically collect wet deposition continuously with an off-grid solar top-up power package. Monthly collections were performed across the Newfoundland and Labrador Boreal Ecosystem Latitudinal Transect of experimental forest sites from 2015 to 2016. The proof-of-concept systems were validated with baseline measurements of pH and conductivity and then applied to dissolved organic carbon as an analyte of emerging biogeochemical interest.
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Atmospheric aqueous chemistry can have profound effects on our environment, as illustrated by historical data from Whiteface Mountain (WFM) that were critical for uncovering the process of acid rain. The current study updates the long-term trends in cloud water composition at WFM for the period 1994 to 2021. We highlight the emergence of a new chemical regime at WFM dominated by organics and ammonium, quite different from the highly acidic regime observed in the past but not necessarily
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Teles C. Furlani, Patrick R. Veres, Kathryn E. R. Dawe, J. Andrew Neuman, Steven S. Brown, Trevor C. VandenBoer, and Cora J. Young
Atmos. Meas. Tech., 14, 5859–5871, https://doi.org/10.5194/amt-14-5859-2021, https://doi.org/10.5194/amt-14-5859-2021, 2021
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Short summary
A commercial dynamic chamber system is modified to measure reactive nitrogen and greenhouse gas fluxes of interest for climate and air quality. The system is optimized for high performance so that fluxes of surface-active gases like ammonia, or reactive gases like nitrogen dioxide, can be made robustly. Lab and field measurements demonstrate consistent fluxes with those from other in-situ agricultural soil reports, as these are expected hot spots of reactive nitrogen gas exchange.
A commercial dynamic chamber system is modified to measure reactive nitrogen and greenhouse gas...
