Land Surface Albedo Variations in Sanjiang Plain from 1982 to 2015: Assessing with GLASS Data
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Springer Science Press www.springerlink.com/content/1002-0063
Land Surface Albedo Variations in Sanjiang Plain from 1982 to 2015: Assessing with GLASS Data LI Xijia1, 2, ZHANG Hongyan1, QU Ying1 (1. Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, China; 2. School of Geomatics and Prospecting Engineering, Jilin Jianzhu University, Changchun 130118, China) Abstract: As a key parameter for indicating the fraction of surface-reflected solar incident radiation, land surface albedo plays an important role in the Earth’s surface energy budget (SEB). Since the Sanjiang Plain has been severely affected by human activities (e.g., reclamation and shrinking of wetlands), it is important to assess the spatiotemporal variations of surface albedo in this region using a long-term remote sensing dataset. In order to investigate the surface albedo climatology, trends, and mechanisms of change, we evaluated the surface albedo variations in the Sanjiang Plain, China from 1982 to 2015 using the Global LAnd Surface Satellite (GLASS) broadband surface albedo product. The results showed that: 1) an increasing annual trend (+0.000 58/yr) of surface albedo was discovered in the Sanjiang Plain based on the GLASS albedo dataset, with a much stronger increasing trend (+0.001 26/yr) occurring during the winter. Most of the increasing trends occurred over the cultivated land, unused land, and land use conversion types located in the northeastern Sanjiang Plain. 2) The increasing trend of land surface albedo in Sanjiang Plain can be largely explained by the changes of both snow cover extent and land use. The surface albedo in winter is highly correlated with the snow cover extent in the Sanjiang Plain, and the increasing trend of surface albedo can be further enhanced by the land use changes. Keywords: land surface albedo; Global LAnd Surface Satellite (GLASS) data; land use change; surface energy budget; Sanjiang Plain Citation: LI Xijia, ZHANG Hongyan, QU Ying, 2020. Land Surface Albedo Variations in Sanjiang Plain from 1982 to 2015: Assessing with GLASS Data. Chinese Geographical Science, 30(5): 876–888. https://doi.org/10.1007/s11769-020-1152-x
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Introduction
As a key parameter for indicating the fraction of surface-reflected solar incident radiation, as well as the fraction of absorbed shortwave energy, the variations of land surface albedo play an important role in the Earth’s surface energy budget (SEB) (Trenberth et al., 2009; Liang et al., 2010). Over recent decades, the land surface albedo in many regions has changed significantly due to human activities and environmental variations (He et al., 2014), thus making it necessary to evaluate
the surface albedo trends and their driving forces using observed data. However, since surface observation sites have small footprints that can not represent the spatiotemporal variations of a large area, the surface albedo trends can not be adequately evaluat
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