EGU2020-12856, updated on 12 Jun 2020
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Ammonia, carbon dioxide and methane in Mediterranean paddy fields along the 2019 crop season

Carme Estruch1, Roger Curcoll1, Marta Borrós1, Alba Àgueda2, and Josep-Anton Morguí1
Carme Estruch et al.
  • 1Universitat Autònoma de Barcelona, Institut de Ciència i Tecnologia Ambientals, Bellaterra, Spain (,
  • 2Departament d’Enginyeria Química, Universitat Politècnica de Catalunya (UPC), Spain

Human activities implying land management are potential sources of greenhouse gases (GHGs) such as carbon dioxide (CO2) and methane (CH4). In addition, agricultural management practices enhances the presence of reactive gases in the atmosphere such as ammonia (NH3).  Knowing the atmospheric variability of gases in relation to the different stages of the rice culture cycle and other anthropic activities could help to improve GHGs' mitigation strategies in deltas.

A mobile survey was undertaken through 2019 in the Ebro Delta as a part of the ClimaDat Network project (DEC station,, to study the effect of land management in the spatial and temporal variability of greenhouse gases and NH3 concentrations. We are broadening the scope of a survey undertaken in 2012 (Àgueda et al. 2017). In the new survey we increased the total number of transects and longitude every three weeks during a year, starting in December 2018.

Whereas atmospheric NH3 concentration links with diurnal and seasonal cycles, the distribution of CO2 and CH4 shows a combination of spatial and temporal variability.   Our aim is to understand how we can use wind trajectories to find the principal sources of atmospheric variability. That is, can wind direction improve our comprehension of metabolic processes occurring in paddy lands? In this work, we use wind trajectories as means of spatial classification, to explore the spatiotemporal dynamic affecting the potential of CO2 and CH4 atmospheric concentration. 

How to cite: Estruch, C., Curcoll, R., Borrós, M., Àgueda, A., and Morguí, J.-A.: Ammonia, carbon dioxide and methane in Mediterranean paddy fields along the 2019 crop season, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-12856,, 2020


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displays version 1 – uploaded on 05 May 2020
  • CC1: Comment on EGU2020-12856, Ana López Ballesteros, 07 May 2020

    This is super interesting, congrats Carme et al. for the work done! I´m curious about the experimental set-up, did you measure other variables apart from GHG concentrations when doing the transects? (ej. VPD, Tair, Tsoil, SWC...? Are you planning to measure isotopes? In case of methane, I guess you substracted the fraction of CH4 concentrations that are transported to a given ground point from othe rplaces through wind, am I right? Regarding ammonia, what process do you think is causing a higher concentration coming from the sea? 

    • AC1: Reply to CC1, Carme Estruch, 07 May 2020

      Thank you Ana! We'd measured air temperature, air water content, and air density, all data georeferenced, but not for soils. Hydrogen sulphide was measured too. We prepared (JosepAnton prepared) campaigns for flux measurementsfor this year but not for the transects( Spring 2020) by chambers methods, plus dissolved gases / gradients at some of the highest variability points. Unfortunantly confinement stopped the planned spring campaigns.

       For the isotopes, we also think was a good idea to analyze. The Methane isotope's instrument is at the US premises of Picarro for maintenance. Borders are closed. We are waiting. For our analysis we considered for each transect percentile 1 as background CH4 concentrations and subtracted it to the CH4 concentration to a given point as you point.

      And regarding ammonia we consider there must be local marine production of NH3 in O2 depleted zones. Consider that Ebro Delta is highly productive in organic matter.


       (Kind regards: Carme and JosepAnton).