Preprints
https://doi.org/10.5194/egusphere-2023-1526
https://doi.org/10.5194/egusphere-2023-1526
20 Jul 2023
 | 20 Jul 2023

Observational relationships between ammonia, carbon dioxide and water vapor under a wide range of meteorological and turbulent conditions: RITA-2021 campaign

Ruben Bastiaan Schulte, Jordi Vilà-Guerau de Arellano, Shelley van der Graaf, Susanna Rutledge-Jonker, Jun Zhang, and Margreet Catharijne van Zanten

Abstract. We present a comprehensive observational approach, aiming to establish relations between the surface-atmosphere exchange of ammonia (NH3) and the CO2 uptake and transpiration by vegetation. In doing so, we study relationships useful for the the improvement and development of NH3 flux representations and their dependences. The NH3 concentration and flux are measured using a novel open-path miniDOAS measurement setup, taken during the five week RITA-2021 campaign (25 August until 12 October 2021) at the Ruisdael Observatory at Cabauw, the Netherlands. After filtering for unobstructed flow, sufficient turbulent mixing and CO2 uptake, we find the diurnal variability of the NH3 flux to be characterized by daytime emissions (0.05 μg m-2 s-1 on average) and deposition at sunrise and sunset (-0.05 μg m-2 s-1 on average). We first compare the NH3 flux to the observed gross primary production (GPP), representing CO2 uptake, and latent heat flux (LvE), representing to evapotranspiration. Next we study the observations following the main drivers of the dynamic vegetation response, which are photosynthetically active radiation (PAR), temperature (T) and the water vapor pressure deficit (VPD). Our findings show indication of the dominance of stomatal emission of NH3, with high correlation between the observed emissions and both net LvE (0.70) and PAR (0.72), as well as close similarities in the diurnal variability of the NH3 flux and GPP. However, the efforts to establish relationships are hampered due to the amount of diversity of NH3 sources of the active agricultural region and low data availability after filtering. Our findings show the need to collocate meteorological, carbon and nitrogen studies to advance on our understanding of NH3 deposition and its representation.

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Journal article(s) based on this preprint

26 Jan 2024
Observational relationships between ammonia, carbon dioxide and water vapor under a wide range of meteorological and turbulent conditions: RITA-2021 campaign
Ruben B. Schulte, Jordi Vilà-Guerau de Arellano, Susanna Rutledge-Jonker, Shelley van der Graaf, Jun Zhang, and Margreet C. van Zanten
Biogeosciences, 21, 557–574, https://doi.org/10.5194/bg-21-557-2024,https://doi.org/10.5194/bg-21-557-2024, 2024
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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We analysed measurements, aiming to find relations between the surface atmosphere exchange of...
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