Land-Cover and Surface Water Change Drive Large Albedo Increases in South America*

Earth Interactions

Scott R.Loarie¹ 

关键词: Land-cover change;    Albedo;    MODIS;   

DOI  :  10.1175/2010EI342.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

Abstract Albedo is an important factor affecting global climate, but uncertainty in the sources and magnitudes of albedo change has led to simplistic treatments of albedo in climate models. Here, the authors examine nine years (2000–08) of historical 1-km Moderate Resolution Imaging Spectroradiometer (MODIS) albedo estimates across South America to advance understanding of the magnitude and sources of large-scale albedo changes. The authors use the magnitude of albedo change from the arc of deforestation along the southeastern edge of the Brazilian Amazon (+2.8%) as a benchmark for comparison. Large albedo increases (>+2.8%) were 2.2 times more prevalent than similar decreases throughout South America. Changes in surface water drove most large albedo changes that were not caused by vegetative cover change. Decreased surface water in the Santa Fe and Buenos Aires regions of Argentina was responsible for albedo increases exceeding that of the arc of deforestation in magnitude and extent. Although variations...

【 授权许可】

Unknown