Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 531533
Title Grain Yield Observations Constrain Cropland CO2 Fluxes Over Europe
Author(s) Combe, M.; Wit, A.J.W. de; Vilà-Guerau de arellano, J.; Molen, M.K. van der; Magliulo, V.; Peters, W.
Source Journal of Geophysical Research: Biogeosciences 122 (2017)12. - ISSN 2169-8953 - p. 3238 - 3259.
DOI http://dx.doi.org/10.1002/2017JG003937
Department(s) Alterra - Earth informatics
PE&RC
WIMEK
Meteorology and Air Quality
Publication type Refereed Article in a scientific journal
Publication year 2017
Keyword(s) Carbon cycle - CO - Cropland - Inverse modeling - Net ecosystem exchange - Optimization
Abstract Carbon exchange over croplands plays an important role in the European carbon cycle over daily to seasonal time scales. A better description of this exchange in terrestrial biosphere models-most of which currently treat crops as unmanaged grasslands-is needed to improve atmospheric CO2 simulations. In the framework we present here, we model gross European cropland CO2 fluxes with a crop growth model constrained by grain yield observations. Our approach follows a two-step procedure. In the first step, we calculate day-to-day crop carbon fluxes and pools with the WOrld FOod STudies (WOFOST) model. A scaling factor of crop growth is optimized regionally by minimizing the final grain carbon pool difference to crop yield observations from the Statistical Office of the European Union. In a second step, we re-run our WOFOST model for the full European 25 × 25 km gridded domain using the optimized scaling factors. We combine our optimized crop CO2 fluxes with a simple soil respiration model to obtain the net cropland CO2 exchange. We assess our model's ability to represent cropland CO2 exchange using 40 years of observations at seven European FluxNet sites and compare it with carbon fluxes produced by a typical terrestrial biosphere model. We conclude that our new model framework provides a more realistic and strongly observation-driven estimate of carbon exchange over European croplands. Its products will be made available to the scientific community through the ICOS Carbon Portal and serve as a new cropland component in the CarbonTracker Europe inverse model.
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