Measurement and modelling of the dynamics of NH<sub>3</sub> surface–atmosphere exchange over the Amazonian rainforest
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Published:2021-05-06
Issue:9
Volume:18
Page:2809-2825
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Ramsay RobbieORCID, Di Marco Chiara F.ORCID, Heal Mathew R.ORCID, Sörgel MatthiasORCID, Artaxo PauloORCID, Andreae Meinrat O.ORCID, Nemitz EikoORCID
Abstract
Abstract. Local and regional modelling of NH3 surface exchange is required to quantify nitrogen deposition to, and emissions from, the biosphere. However, measurements and model parameterisations for many remote ecosystems – such as tropical rainforest – remain sparse. Using 1 month of hourly measurements of NH3 fluxes and meteorological parameters over a remote Amazon rainforest site (Amazon Tall Tower Observatory, ATTO), six model parameterisations based on a bidirectional, single-layer canopy compensation point resistance model were developed to simulate observations of NH3 surface exchange. Canopy resistance was linked to either relative humidity at the canopy level (RHz0′), vapour pressure deficit, or a parameter value based on leaf wetness measurements. The ratio of apoplastic NH4+ to H+ concentration, Γs, during this campaign was inferred to be 38.5 ± 15.8. The parameterisation that reproduced the observed net exchange of NH3 most accurately was the model that used a cuticular resistance (Rw) parameterisation based on leaf wetness measurements and a value of Γs=50 (Pearson correlation r=0.71). Conversely, the model that performed the worst at replicating measured NH3 fluxes used an Rw value modelled using RHz0′ and the inferred value of Γs=38.5 (r=0.45). The results indicate that a single-layer canopy compensation point model is appropriate for simulating NH3 fluxes from tropical rainforest during the Amazonian dry season and confirmed that a direct measurement of (a non-binary) leaf wetness parameter improves the ability to estimate Rw. Current inferential methods for determining Γs were noted as having difficulties in the humid conditions present at a rainforest site.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
Reference57 articles.
1. Adon, M., Galy-Lacaux, C., Yoboué, V., Delon, C., Lacaux, J. P., Castera,
P., Gardrat, E., Pienaar, J., Al Ourabi, H., Laouali, D., Diop, B.,
Sigha-Nkamdjou, L., Akpo, A., Tathy, J. P., Lavenu, F., and Mougin, E.: Long
term measurements of sulfur dioxide, nitrogen dioxide, ammonia, nitric acid
and ozone in Africa using passive samplers, Atmos. Chem. Phys., 10,
7467–7487, https://doi.org/10.5194/acp-10-7467-2010, 2010. a 2. Adon, M., Galy-Lacaux, C., Delon, C., Yoboue, V., Solmon, F., and Kaptue
Tchuente, A. T.: Dry deposition of nitrogen compounds (NO2,
HNO3, NH3), sulfur dioxide and ozone in west and central
African ecosystems using the inferential method, Atmos. Chem. Phys., 13,
11351–11374, https://doi.org/10.5194/acp-13-11351-2013, 2013. a 3. Andreae, M. O., Acevedo, O. C., Araùjo, A., Artaxo, P., Barbosa, C.
G. G., Barbosa, H. M. J., Brito, J., Carbone, S., Chi, X., Cintra, B. B. L.,
da Silva, N. F., Dias, N. L., Dias-Júnior, C. Q., Ditas, F., Ditz, R.,
Godoi, A. F. L., Godoi, R. H. M., Heimann, M., Hoffmann, T., Kesselmeier, J.,
Könemann, T., Krüger, M. L., Lavric, J. V., Manzi, A. O., Lopes,
A. P., Martins, D. L., Mikhailov, E. F., Moran-Zuloaga, D., Nelson, B. W.,
Nölscher, A. C., Santos Nogueira, D., Piedade, M. T. F.,
Pöhlker, C., Pöschl, U., Quesada, C. A., Rizzo, L. V., Ro, C.-U.,
Ruckteschler, N., Sá, L. D. A., de Oliveira Sá, M., Sales,
C. B., dos Santos, R. M. N., Saturno, J., Schöngart, J., Sörgel,
M., de Souza, C. M., de Souza, R. A. F., Su, H., Targhetta, N., Tóta,
J., Trebs, I., Trumbore, S., van Eijck, A., Walter, D., Wang, Z., Weber, B.,
Williams, J., Winderlich, J., Wittmann, F., Wolff, S., and
Yáñez-Serrano, A. M.: The Amazon Tall Tower Observatory (ATTO):
overview of pilot measurements on ecosystem ecology, meteorology, trace
gases, and aerosols, Atmos. Chem. Phys., 15, 10723–10776,
https://doi.org/10.5194/acp-15-10723-2015, 2015. a 4. Baldocchi, D.: A Multi-layer model for estimating sulfur dioxide deposition to
a deciduous oak forest canopy, Atmos. Environ., 22, 869–884,
https://doi.org/10.1016/0004-6981(88)90264-8, 1988. a 5. Burkhardt, J. and Eiden, R.: Thin water films on coniferous needles: A new
device for the study of water vapour condensation and gaseous deposition to
plant surfaces and particle samples, Atmos. Environ., 28,
2001–2011, https://doi.org/10.1016/1352-2310(94)90469-3, 1994. a
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