Responses of soil N2O emissions and nitrate leaching on climate input data aggregation: a biogeochemistry model ensemble study

Edwin Haas


Numerical simulation models are increasingly used to estimate greenhouse gas (GHG) emissions at site to regional scales and are outlined as the most advanced methodology (Tier 3) for national emission inventory in the framework of UNFCCC reporting.

Low resolution simulations needs less effort in computation and data management, but details could be lost during data aggregation associated with high uncertainties of the simulation results. This aggregation effect and its uncertainty will be propagated with the simulations.  This paper aims to study the aggregation effects of climate and soil input data on soil N2O emissions and nitrate leaching by comparing different biogeochemistry models. We simulated two 30-year cropping systems (winter wheat and maize monocultures) under nutrient-limited conditions. Input data (climate and soil) was based on a 1 km resolution aggregated on resolutions of 10, 25, 50, and 100. In the first step, the soil data was kept homogenous using representative soil properties while climate data was used on all different scales. In the second step, the climate data was kept homogeneous while soil initial data was used on all different scales. Finally in the third step we have used spatially explicit climate and soil data on all different scales. We analyzed the N2O emissions per unit of crop yield as well as the nitrate leaching on the annual average as well as on daily resolution to study pulsing events for all scenarios and on all scales. The study presents an analysis of the influence of data aggregation.

The study gives an indication on adequate spatial aggregation schemes in dependence on the scope of regionalization studies addressing the quantification of losses of reactive nitrogen from managed arable systems.

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Authors: Haas, Edwin9; Kiese, Ralf9; Klatt, Steffen9; Hoffmann, Holger2; Zhao, Gang2; Constantin, Julie3; Raynal, Helene3; Wallach, Daniel3; Sosa, Carmen4; Lewan, Elisabet4; Eckersten, Henrik5; Specka, Xenia6; Kersebaum, Kurt-Christian6; Nendel, Claas6; Kuhnert, Matthias7; Yeluripati, Jagadeesh8; Grosz, Balázs*1; Dechow, Rene1; Teixeira, Edmar10; Bindi, Marco11; Trombi, Giacomo11; Moriondo, Marco12; Doro, Luca13; Roggero, Pier Paolo13; Zhao, Zhigan14; Wang, Enli14; Vanuytrecht, Eline15; Tao, Fulu16; Rötter, Reimund16; Cammarano, Davide17, Asseng, Senthold17; Weihermüller, Lutz18; Siebert, Stefan2; Gaiser, Thomas2; Ewert, Frank2

Institute of Meteorology and Climate Research – Atmospheric Environmental Research, Karlsruhe Institute of Technology, Kreuzeckbahnstraße 19, 82467 Garmisch-Partenkirchen, DE; 2Crop Science Group, INRES, University of Bonn, Katzenburgweg 5, 53115 Bonn, DE; 3Equipe MAGE, INRA, 24 Chemin de Borde Rouge – Auzeville CS 5267, 31326 Castanet-Tolosan Cedex, FR; 4Biogeophysics and water quality, Department of Soil and Environment, Swedish University of Agricultural Sciences, Lennart Hjelms väg 9, 750 07 Uppsala, SE; 5Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Ulls väg 16, 750 07 Uppsala, SE; 6Institute of Landscape Systems Analysis, Leibniz Centre for Agricultural Landscape Research, 15374 Müncheberg, DE; 7Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, 23 St Machar Drive, Aberdeen AB24 3 UU, Scotland, UK; 8The James Hutton Institute, Craigiebuckler, Aberdeen, AB15 8 QH, UK; 9Thünen-Institute of Climate-Smart-Agriculture, Bundesallee 50, 38116 Braunschweig, DE; 10Systems Modelling Team (Sustainable Production Group), The New Zealand Institute for Plant and Food Research Limited, Canterbury Agriculture & Science Centre, Gerald St, Lincoln 7608, NZ; 11Department of Agri-food Production and Environmental Sciences - University of Florence, Piazzale delle Cascine 18, 50144 Firenze, IT; 12Marco Moriondo, CNR-Ibimet, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy; 13Desertification Research Group, Universitá degli Studi di Sassari, Viale Italia 39, 07100 Sassari, IT; 14 CSIRO Land and Water, Clunies Ross Street, Canberra, ACT, AU; 15Division Soil & Water Management, KU Leuven, Celestijnenlaan 200E, PO 2411, 3001 Heverlee, BE; 16Climate Impacts Group, Natural Resources Institute Finland (Luke), 00790 Helsinki, FI; 17Agricultural & Biological Engineering Department, University of Florida, Frazier Rogers Hall, Gainesville, FL 32611, USA; 18Institute of Bio- & Geosciences Agrosphere (IBG-3), Forschungszentrum Jülich, 52425 Jülich, DE

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