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Albedo Response to Land Use Change and Disturbance: A Multi-sensor Approach
Jeffrey
Masek, NASA GSFC, jeffrey.g.masek@nasa.gov
(Presenter)
Feng
Gao, USDA-ARS HRSL, feng.gao@ars.usda.gov
Christopher
A
Williams, Clark University, cwilliams@clarku.edu
Crystal
Schaaf, University of Massachusetts Boston, crystal.schaaf@umb.edu
Yanmin
Shuai, NASA/GSFC, yanmin.shuai@ertcorp.com
Bardan
Ghimire, Clark University, bghimire@clarku.edu
Land-cover change and ecosystem disturbance can alter the surface energy balance through changes in albedo, surface roughness, and evapotranspiration. Previous studies of radiative forcing have been limited by the use of global relationships between land cover and albedo, which may not capture regional differences in albedo response to land cover change. In this project we are pursuing two objectives: (a) an improved estimate of long-term (1700-2100) global albedo change using new satellite (MODIS) products; and (b) an integrated understanding of how disturbance and recovery affect albedo at the landscape scale through the integration of Landsat reflectance information. At the global scale, we have produced a new MODIS-based hierarchical, spatial look-up table relating monthly snow-covered and snow-free albedo to specific land cover types. We have then applied these relations to the global Land Use Harmonization product of Hurtt et al (2006) to quantify both albedo and radiative forcing change since 1700. At the landscape scale a new algorithm (Shuai et al., 2011) generates 30-meter resolution albedo values by merging Landsat nadir surface reflectance with BRDF information from the MCD43A product. This algorithm is being applied to time series of land cover change and forest disturbance in order to assess the impact of increasing disturbance rates on regional albedo. Results from the Idaho/Montana area show that fire and harvest have different albedo trajectories during recovery, with burned area albedo continuing to increase for 10-20 years after the fire event.
Presentation Type: Poster
Session: Poster Session 2-B
(Wed 4:30 PM)
Associated Project(s):
Poster Location ID: 62
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