Reflectance–Elevation Relationships and Their Seasonal Patterns over Twelve Glaciers in Western China Based on Landsat 8 Data

Abstract

Albedo/reflectance is of great importance for glaciers' mass balance and energy budget. Elevation could be a major factor of influence for glacier reflectance, and therefore when studying glacier reflectance, the altitude ranges should be considered. However, due to the limitations of traditional earth observation systems, conventional analyses usually consider the spatial and temporal patterns of the reflectance average, which is severely restricted. The launch of Landsat-8 gives us the opportunity to study the seasonal glacier reflectance-elevation relationship. We have obtained the monthly near-nadir reflectance per 100 m for twelve glaciers in western China based on 372 scenes of Landsat 8 images acquired from April 2013 to December 2015. Variations of monthly broadband reflectance, reflectance-elevation relationships and reflectance gradients are analyzed and discussed. The results show that the linear trend of the reflectance-elevation relationship (when the altitude is less than 6100 m) is very significant; elevation has greater influence than location on seasonal reflectance variations; and the level of glacier reflectance gradient may relate with its climate. This may be the first work that has used remote-sensing data to analyze seasonal glacier reflectance-elevation patterns.

Glacier facies characterization using optical satellite data: Impacts of radiometric resolution, seasonality, and surface morphology

“…Still, optical-based glacier facies mapping has certain challenges arising due to the sensor-specific (spatial, temporal, and radiometric resolutions) and natural (seasonal changes, metamorphism, contamination, cloud cover, elevation, and surface morphology of a glacier) factors. These factors control the reflectance of glacier facies, and, hence, their spatial distribution, as summarized by Foster et al (1987), Takeuchi et al (2003), and Li et al (2017).…”