Title
Dry deposition of ammonia in a coastal dune area: Measurements and modeling
Author
Vendel, K.J.A.
Wichink Kruit, R.J.
Blom, M.J.
van den Bulk, W.C.M.
van Egmond, B.F.
Frumau, K.F.A.
Rutledge-Jonker, S.
Hensen, A.
van Zanten, M.C.
Publication year
2023
Abstract
Ammonia deposition is a threat to many natural ecosystems, including coastal dune areas, because of eutrophication and acidification. Direct measurements of ammonia fluxes are nevertheless scarce. In this paper we present a full year of measurements to derive the ammonia dry deposition flux in a Dutch coastal dune ecosystem, based on the aerodynamic flux-gradient method (AGM). We found a mean ammonia flux of -7.1 ± 1.7 ng m-2 s-1, and an annual ammonia deposition flux of -132 ± 32 mol ha-1 yr-1 (equivalent to 1.8 ± 0.4 kg N ha-1 yr-1), which is at the low end of the range from estimates from literature made with inferential methods. Modeling the fluxes with the DEPAC module resulted in a mean flux of -17.0 ng m-2 s-1. The model overestimated the deposition fluxes, but diurnal variations of the fluxes derived from measurements were well captured by the model. We propose to change certain DEPAC parameters, like the leaf area index, to values more applicable for a dune ecosystem and show that this improves the agreement between model and measurements. (C) 2023 The Authors
Subject
Ammonia fluxes
Coastal dunes
Dry deposition
Flux gradient
Measurements
Modeling
Energy Efficiency
Energy / Geological Survey Netherlands
To reference this document use:
http://resolver.tudelft.nl/uuid:16e090aa-6168-4603-83ef-dfb885c6f292
DOI
https://doi.org/10.1016/j.atmosenv.2023.119596
TNO identifier
982461
Publisher
Elsevier Ltd
ISSN
1352-2310
Source
Atmospheric Environment, 298 (298), 1-10
Document type
article