Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.154 IF 5.154
  • IF 5-year value: 5.697 IF 5-year
    5.697
  • CiteScore value: 5.56 CiteScore
    5.56
  • SNIP value: 1.761 SNIP 1.761
  • IPP value: 5.30 IPP 5.30
  • SJR value: 3.164 SJR 3.164
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 59 Scimago H
    index 59
  • h5-index value: 49 h5-index 49
Volume 7, issue 2
Geosci. Model Dev., 7, 613–620, 2014
https://doi.org/10.5194/gmd-7-613-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Geosci. Model Dev., 7, 613–620, 2014
https://doi.org/10.5194/gmd-7-613-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Methods for assessment of models 16 Apr 2014

Methods for assessment of models | 16 Apr 2014

The Community Land Model underestimates land-use CO2 emissions by neglecting soil disturbance from cultivation

S. Levis1, M. D. Hartman2, and G. B. Bonan1 S. Levis et al.
  • 1National Center for Atmospheric Research, Boulder, Colorado, USA
  • 2Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, Colorado, USA

Abstract. The Community Land Model (CLM) can simulate planting and harvesting of crops but does not include effects of cultivation on soil carbon decomposition. The biogeochemistry model DayCent does account for cultivation and provides a baseline for evaluating the CLM. With the goal of representing cultivation effects on soil carbon decomposition, we implemented the DayCent cultivation parameterization in the CLM and compared CLM and DayCent simulations at eight Midwestern United States sites with and without the cultivation parameterization. Cultivation decreases soil carbon by about 1350 gC m−2 in the CLM and 1660 gC m−2 in DayCent across the eight sites from the first cultivation (early 1900s) to 2010. CLM crop simulations without cultivation have soil carbon gain, not loss, over this period, in contrast to the expected declining trends in agricultural soil carbon. A global cultivation simulation for 1973–2004 reduces ecosystem carbon by 0.4 Pg yr−1 over temperate corn, soybean, and cereal crop areas, which occupy approximately 1/3 of global crop area. Earth System Models may improve their atmospheric CO2 and soil carbon simulations by accounting for enhanced decomposition from cultivation.

Publications Copernicus
Download
Citation