Articles | Volume 20, issue 5
© Author(s) 2023. This work is distributed underthe Creative Commons Attribution 4.0 License.
Atmospheric deposition of reactive nitrogen to a deciduous forest in the southern Appalachian Mountains
- Final revised paper (published on 09 Mar 2023)
- Supplement to the final revised paper
- Preprint (discussion started on 23 Jun 2022)
- Supplement to the preprint
Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor |
: Report abuse
RC1: 'Comment on bg-2022-133', Anonymous Referee #1, 19 Jul 2022
- AC1: 'Reply on RC1', John Walker, 29 Sep 2022
RC2: 'Referee's comments on bg-2022-133', Chris Flechard, 11 Aug 2022
- AC2: 'Reply on RC2', John Walker, 29 Sep 2022
Peer review completion
AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to minor revisions (review by editor) (06 Oct 2022) by Ivonne Trebs
AR by John Walker on behalf of the Authors (29 Nov 2022) Author's response
EF by Polina Shvedko (01 Dec 2022) Manuscript Author's tracked changes
ED: Publish as is (08 Dec 2022) by Ivonne Trebs
AR by John Walker on behalf of the Authors (17 Dec 2022)
AA: Author's adjustment | EA: Editor approval
AA by John Walker on behalf of the Authors (06 Mar 2023) Author's adjustment Manuscript
EA: Adjustments approved (06 Mar 2023) by Ivonne Trebs
The manuscript by Walker et al. presents results from a study investigating atmospheric deposition of reactive nitrogen to a deciduous forest at the USDA Forest Service Coweeta Hydrologic Laboratory in the southern Appalachian Mountains. The authors use several well-established measurement methods to differentiate between oxidized and reduced as well as organic and inorganic compounds found in wet and dry deposition. Finally, they apply a bi-directional resistance-based model driven with the observed measurements of Nr air concentrations, micrometeorology, canopy structure, and biogeochemical parameters to present the full reactive nitrogen budget for the site.
While the character of the paper is a report-style compilation of results from a multitude of methods rather than following a clear scientific question, the authors do a great job in thoroughly describing the complexity of reactive nitrogen field investigations and long-term observation. Though continuous eddy-covariance observations are not included, the study represents the state-of-the-art in Nr monitoring and data interpretation. I particularly appreciate the inclusion of field investigations of the ammonia emission potential of green and senescent leaves as well as from litter, which is crucial for model parameterization and rarely conducted. The results are put into a broader context and discussed with regard to air quality regulations in the past, e.g. reduction in oxidized N is now clearly visible. Method uncertainties are sufficiently considered and presented.
The text is very well written and easy to follow. Figures are clear and easy to grasp. The supplemental material is useful and the selection of graphs and tables that were put into this section is good. This is the most comprehensive single-site study I am aware of and definitely deserves publication.
I only have a few, rather minor, points that should be considered before final presentation in the BG journal: