Global climate forcing from albedo change caused by large-scale deforestation and reforestation: quantification and attribution of geographic variation

Large-scale deforestation and reforestation have contributed substantially to historical and contemporary global climate change in part through albedo-induced radiative forcing, with meaningful implications for forest management aiming to mitigate climate change. Associated warming or cooling varies widely across the globe due to a range of factors including forest type, snow cover, and insolation, but resulting geographic variation remains poorly described and has been largely based on model assessments. This study provides an observation-based approach to quantify local and global radiative forcings from large-scale deforestation and reforestation and further examines mechanisms that result in the spatial heterogeneity of radiative forcing. We incorporate a new spatially and temporally explicit land cover-specific albedo product derived from Moderate Resolution Imaging Spectroradiometer with a historical land use data set (Land Use Harmonization product). Spatial variation in radiative forcing was attributed to four mechanisms, including the change in snow-covered albedo, change in snow-free albedo, snow cover fraction, and incoming solar radiation. We find an albedo-only radiative forcing (RF) of −0.819 W m−2 if year 2000 forests were completely deforested and converted to croplands. Albedo RF from global reforestation of present-day croplands to recover year 1700 forests is estimated to be 0.161 W m−2. Snow-cover fraction is identified as the primary factor in determining the spatial variation of radiative forcing in winter, while the magnitude of the change in snow-free albedo is the primary factor determining variations in summertime RF. Findings reinforce the notion that, for conifers at the snowier high latitudes, albedo RF diminishes the warming from forest loss and the cooling from forest gain more so than for other forest types, latitudes, and climate settings.

[1]  Limin Yang,et al.  Development of a global land cover characteristics database and IGBP DISCover from 1 km AVHRR data , 2000 .

[2]  R. Reynolds,et al.  The NCEP/NCAR 40-Year Reanalysis Project , 1996, Renewable Energy.

[3]  E. Stehfest,et al.  Harmonization of land-use scenarios for the period 1500–2100: 600 years of global gridded annual land-use transitions, wood harvest, and resulting secondary lands , 2011 .

[4]  G. Bonan.  Forests and Climate Change: Forcings, Feedbacks, and the Climate Benefits of Forests , 2008, Science.

[5]  Christopher A. Barnes,et al.  Radiative forcing over the conterminous United States due to contemporary land cover land use albedo change , 2008 .

[6]  Thomas Raddatz,et al.  Biogeophysical versus biogeochemical climate response to historical anthropogenic land cover change , 2010 .

[7]  David P. Roy,et al.  Radiative forcing over the conterminous United States due to contemporary land cover land use change and sensitivity to snow and interannual albedo variability , 2010 .

[8]  W. Collins,et al.  The NCEP–NCAR 50-Year Reanalysis: Monthly Means CD-ROM and Documentation , 2001 .

[9]  N. DiGirolamo,et al.  MODIS snow-cover products , 2002 .

[10]  Karen M. Shell,et al.  Using the Radiative Kernel Technique to Calculate Climate Feedbacks in NCAR's Community Atmospheric Model , 2008 .

[11]  C. Woodcock,et al.  Evaluation of MODIS albedo product (MCD43A) over grassland, agriculture and forest surface types during dormant and snow-covered periods , 2014 .

[12]  Alan H. Strahler,et al.  Global land cover mapping from MODIS: algorithms and early results , 2002 .

[13]  Crystal B. Schaaf,et al.  Global albedo change and radiative cooling from anthropogenic land cover change, 1700 to 2005 based on MODIS, land use harmonization, radiative kernels, and reanalysis , 2014 .

[14]  Crystal B. Schaaf,et al.  Radiative forcing due to anthropogenic vegetation change based on MODIS surface albedo data , 2005 .

[15]  E. Lambin,et al.  The emergence of land change science for global environmental change and sustainability , 2007, Proceedings of the National Academy of Sciences.

[16]  S. Malyshev,et al.  The underpinnings of land‐use history: three centuries of global gridded land‐use transitions, wood‐harvest activity, and resulting secondary lands , 2006 .

[17]  Nathalie de Noblet-Ducoudré,et al.  Climatic Impact of Global-Scale Deforestation: Radiative versus Nonradiative Processes , 2010 .

[18]  S. Carpenter,et al.  Global Consequences of Land Use , 2005, Science.

[19]  Alan H. Strahler,et al.  Aqua and Terra MODIS Albedo and Reflectance Anisotropy Products , 2010 .

[20]  K. Caldeira,et al.  Combined climate and carbon-cycle effects of large-scale deforestation , 2006, Proceedings of the National Academy of Sciences.

[21]  Andrei P. Sokolov,et al.  Climate Dynamics (2006) DOI 10.1007/s00382-005-0092-6 , 2005 .

[22]  N. C. Strugnell,et al.  First operational BRDF, albedo nadir reflectance products from MODIS , 2002 .

[23]  Kees Klein Goldewijk,et al.  Biogeophysical effects of land use on climate : Model simulations of radiative forcing and large-scale temperature change , 2007 .

[24]  Ann Henderson-Sellers,et al.  Impacts of Tropical Deforestation. Part I: Process Analysis of Local Climatic Change , 1996 .

[25]  Feng Gao,et al.  Multiscale climatological albedo look-up maps derived from moderate resolution imaging spectroradiometer BRDF/albedo products , 2014 .