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Radiation budget changes with dry forest clearing in temperate Argentina

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dc.contributor.author Houspanossian, Javier
dc.contributor.author Nosetto, Marcelo
dc.contributor.author Jobágy, Esteban G.
dc.date.accessioned 2015-10-19T12:05:55Z
dc.date.available 2015-10-19T12:05:55Z
dc.date.copyright 2012
dc.date.issued 2013
dc.identifier.citation Houspanossian, J., Nosetto, M., & Jobágy, E.G. (2013). Radiation budget changes with dry forest clearing in temperate Argentina. Global Change Biology, 19, 1211-1222. doi:10.1111/gcb.12121 en
dc.identifier.uri http://hdl.handle.net/10625/54820
dc.description.abstract Land cover changes may affect climate and the energy balance of the Earth through their influence on the greenhouse gas composition of the atmosphere (biogeochemical effects) but also through shifts in the physical properties of the land surface (biophysical effects). We explored how the radiation budget changes following the replacement of temperate dry forests by crops in central semiarid Argentina and quantified the biophysical radiative forcing of this transformation. For this purpose, we computed the albedo and surface temperature for a 7-year period (2003–2009) from MODIS imagery at 70 paired sites occupied by native forests and crops and calculated the radiation budget at the tropopause and surface levels using a columnar radiation model parameterized with satellite data. Mean annual black-sky albedo and diurnal surface temperature were 50% and 2.5 °C higher in croplands than in dry forests. These contrasts increased the outgoing shortwave energy flux at the top of the atmosphere in croplands by a quarter (58.4 vs. 45.9 W m 2) which, together with a slight increase in the outgoing longwave flux, yielded a net cooling of 14 W m 2. This biophysical cooling effect would be equivalent to a reduction in atmospheric CO2 of 22 Mg C ha 1, which involves approximately a quarter to a half of the typical carbon emissions that accompany deforestation in these ecosystems. We showed that the replacement of dry forests by crops in central Argentina has strong biophysical effects on the energy budget which could counterbalance the biogeochemical effects of deforestation. Underestimating or ignoring these biophysical consequences of land-use changes on climate will certainly curtail the effectiveness of many warming mitigation actions, particularly in semiarid regions where high radiation load and smaller active carbon pools would increase the relative importance of biophysical forcing. en
dc.format.mimetype application/pdf
dc.language.iso en
dc.publisher Blackwell en
dc.subject ALBEDO en
dc.subject SEMIARID ZONE en
dc.subject SOLAR RADIATION en
dc.subject DEFORESTATION en
dc.subject ECOSYSTEMS en
dc.subject LAND USE en
dc.subject AGROECOLOGY en
dc.subject EVAPOTRANSPIRATION en
dc.subject MATHEMATICAL MODELS en
dc.subject CROP MANAGEMENT en
dc.subject CULTIVATION SYSTEMS en
dc.subject BIOMASS en
dc.subject CLIMATE CHANGE en
dc.subject BIOCLIMATOLOGY en
dc.title Radiation budget changes with dry forest clearing in temperate Argentina en
dc.type Article en
idrc.project.number 106601
idrc.project.componentnumber 106601001
idrc.project.title Floods, Droughts and Farming on the Plains of Argentina and Paraguay, Pampas and Chaco Regions en
idrc.copyright.holder Blackwell Publishing Ltd
idrc.dspace.access IDRC Only en
idrc.rims.adhocgroup IDRC SUPPORTED en
idrc.recordsserver.bcsnumber IC01-947-18
idrc.noaccess Due to copyright restrictions the full text of this research output is not available in the IDRC Digital Library or by request from the IDRC Library. / Compte tenu des restrictions relatives au droit d'auteur, le texte intégral de cet extrant de recherche n'est pas accessible dans la Bibliothèque numérique du CRDI, et il n'est pas possible d'en faire la demande à la Bibliothéque du CRDI. en


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