Journal
AGRICULTURAL AND FOREST METEOROLOGY
Volume 232, Issue -, Pages 118-127Publisher
ELSEVIER
DOI: 10.1016/j.agrformet.2016.08.015
Keywords
Albedo change; Deforestation; Land use; Agricultural management; Energy budget; Radiative forcing; Semiarid dry forest
Categories
Funding
- National Research Council of Argentina [CONICET- PIP 112-201101-00217, PIP 112-201501-00609]
- International Research Development Center (IDRC-Canada) [106601-001]
- ANPCyT [PICT 2014-2790]
- Inter-American Institute for Global Change Research (IAI) [CRN II 3095]
- US National Science Foundation [448 GEO-0452325]
- ICER
- Directorate For Geosciences [1459322, 1128040] Funding Source: National Science Foundation
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Deforestation affects climate and the energy balance of the Earth not only through the release of greenhouse gases but also through shifts in the physical properties of the surface. These physical effects can be strongly dependent not only on the deforestation event but on the land use choices and management that follow it. Here we explored how the albedo and radiation balance of the dry subtropical Chaco forests of South America changed over the last decade in response to both deforestation and land use/management. For the whole region we analyzed changes in the mean annual albedo derived from MODIS imagery and their relation with the dominant land use trajectories for a 12-year period (2000-2012). In two focal areas we identified how specific land uses and management shifts affected the seasonality of surface albedo and green vegetation cover, quantifying their associated radiation budget changes and radiative forcing effects. Deforestation accounted for 83% of the regional albedo increase observed in Chaco, yet, land use and land management changes were also a main driver of albedo shifts, explaining the rest of the albedo rise occurred in the region. Albedo raises increased the mean annual outgoing shortwave energy flux at the top of the atmosphere producing a biophysical cooling effect which was strongly dependent on the land use choice and agricultural management, ranging from -8W m(-2) in silvopastoral systems to -17 W m(-2) under single annual cropping schemes. These values are equivalent to a reduction in atmospheric CO2 of 12-27 Mg C ha(-1), or 15-55% of the typical emissions that accompany deforestation in this region. Land use and management choices in the Chaco region produce strong divergences in the resulting albedo seasonality that should not be ignored in the assessment of their net climatic effects and the discussion of possible mitigation actions. (C) 2016 Elsevier B.V. All rights reserved.
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