The surface spectral albedo was measured over coastal landfast sea ice in Prydz Bay (off Zhongshan Station), East Antarctica from 5 October to 26 November of 2016. The mean albedo decreased from late-spring to early-summer, mainly responding to the change in surface conditions from dry (phase I) to wet (phase II). The evolution of the albedo was strongly influenced by the surface conditions, with alternation of frequent snowfall events and katabatic wind that induce snow blowing at the surface. The two phases and day-to-day albedo variability were more pronounced in the near-infrared albedo wavelengths than in the visible ones, as the near-infrared photons are more sensitive to snow metamorphism, and to changes in the uppermost millimeters and water content of the surface. The albedo diurnal cycle during clear sky conditions was asymmetric with respect to noon, decreasing from morning to evening over full and patchy snow cover, and decreasing more rapidly in the morning over bare ice. We conclude that snow and ice metamorphism and surface melting dominated over the solar elevation angle dependency in shaping the albedo evolution. However, we realize that more detailed surface observations are needed to clarify and quantify the role of the various surface processes.

中文翻译：

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南极洲普里兹湾沿海陆固海冰的光谱反照率

2016 年 10 月 5 日至 11 月 26 日，在南极东部普里兹湾（中山站外）沿海陆海冰上测量了表面光谱反照率。平均反照率从晚春到夏初有所下降，主要是响应于从干燥（第一阶段）到潮湿（第二阶段）的表面条件。反照率的演变受到地表条件的强烈影响，频繁的降雪事件和导致地表吹雪的下降风交替发生。这两个阶段和日常反照率变化在近红外反照率波长中比在可见光波长中更明显，因为近红外光子对雪变质作用以及最上部毫米和水含量的变化更敏感的表面。晴空条件下的反照率昼夜循环相对于中午是不对称的，从早上到晚上在完全和不规则的积雪覆盖下减少，在早晨在裸冰上减少得更快。我们得出结论，在塑造反照率演变过程中，冰雪变质作用和地表融化支配了太阳仰角依赖性。然而，我们意识到需要更详细的表面观察来阐明和量化各种表面过程的作用。