Towards an Understanding of the Twentieth-Century Cooling Trend in the Southeastern United States: Biogeophysical Impacts of Land-Use Change

Earth Interactions

W. L.Ellenburg¹ 

关键词: Physical meteorology and climatology;    Climate change;    Latent heating/cooling;    Radiative forcing;    Observational techniques and algorithms;    Satellite observations;    Surface observations;    Applications;    Land use;   

DOI  :  10.1175/EI-D-15-0038.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

AbstractThis paper explores the link between the anomalous warming hole in the southeastern United States and a major land-use/land-cover (LULC) change in the region. Land surface and satellite observations were analyzed to estimate the net radiative forcing due to LULC change. Albedo and latent energy were specifically addressed for the dominant LULC change of agriculture to forests. It was assumed that in the energy-limited environment of the region, the partition of changes in available energy due to albedo will mostly impact the sensible heat. The results show that in the southeastern United States, for the period of 1920 to 1992, the changes in sensible (as a result of albedo) and latent energies are in direct competition with each other. In the spring and early summer months, the croplands are in peak production and the latent energy associated with their evapotranspiration (ET) is comparable to that of the forests so the decrease in radiation due to albedo dominates the signal. However, during the ...

【 授权许可】

Unknown