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| Titel |
Biogeophysical implications of no-tillage agriculture for the European climate and hot extremes |
| VerfasserIn |
E. L. Davin, P. Ciais, S. I. Seneviratne |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250063915
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| Zusammenfassung |
| Cropland management practices aiming at reducing or suppressing tillage (no-till) in order to retain crop residues on the soil surface may have a potential to sequester carbon in soils and are therefore considered a possible option to mitigate climate change [1]. On the other hand, no-till systems may also modify physical properties like surface albedo thereby affecting land-atmosphere exchanges, but such biogeophysical effects have yet to be investigated [2].
Here, we investigate the biogeophysical effect of no-till agriculture over Europe using a regional climate model. A drastic no-till scenario where surface albedo is increased over croplands based on values from in-situ measurements is considered. The cooling effect owing to albedo increase under no-till farming appears to be larger during warm events. This is due to the low cloud cover during these events, thus leading to a more efficient radiative cooling from albedo change. This implies a strong potential of no-till farming to mitigate heat wave impacts. Other biogeophysical processes besides albedo change (e.g., changes in soil water and evapotranspiration) and their climatic effect will be also discussed.
References:
[1] Smith, P., D. Martino, Z. Cai, D. Gwary, H. Janzen, P. Kumar, B. McCarl, S. Ogle, F. O’Mara, C. Rice, B. Scholes, O. Sirotenko (2007): Agriculture. In Climate Change 2007: Mitigation. Contribution of Working Group III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change [B. Metz, O.R. Davidson, P.R. Bosch, R. Dave, L.A. Meyer (eds)], Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA.
[2] Lobell, D. B., G. Bala, and P. B. Duffy (2006), Biogeophysical impacts of cropland management changes on climate , Geophys. Res. Lett. , 33 , L06708, doi:10.1029/2005GL025492. |
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