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根据2006年夏季“七一”冰川自动气象站和光谱仪的反照率资料,分析了夏季“七一”冰川反照率的时、空变化特征.结果表明:夏季“七一”冰川反照率的日际变化受气温影响明显,冰川上、下部位反照率差值动态变化并具有一定的日变化特征.冰川表层积雪随着变质作用的增强,其光谱反射率不断下降,其中紫外和红橙光波段反照率降幅较大(尤其是紫外波段),在紫蓝波段降幅相对较小.晴天时,雪面上紫外及可见光波段反照率日变化幅度要比在冰面上的变幅大,日变化曲线在雪面时也不对称.冰面上各波段反照率日变化较平缓,曲线则都比较对称.无论在雪面还是冰面,近红外波段反照率日变化曲线均比较对称.冰川上全波段反照率的日变化曲线形式趋同于可见光波段反照率的日变化曲线.同时,文中还初步分析了反照率和积雪密度,积雪污化浓度之间的关系,以及反照率变化对径流的影响.
According to the albedo data of the “July 1” glacier automatic weather station and spectrometer in the summer of 2006, the temporal and spatial variations of albedo in the glacier during the summer and the “July 1” glacier were analyzed. The results show that: The glacier albedo changes in the daytime are significantly affected by air temperature, and the albedo differences at the upper and lower glaciers vary dynamically and have certain diurnal variations. The surface snow in the glacier declines continuously with the enhancement of metamorphism, The albedos in UV and red-orange bands decreased greatly (especially in the UV band), but decreased in the purple-blue band. On sunny days, the diurnal variation of the albedo in the UV and visible bands on the snow surface was greater than that on the ice Amplitude and diurnal variation curve are also asymmetric in the snow surface.The diurnal variation of albedo in each band on the ice surface is more gentle and the curves are more symmetrical.The diurnal variation curves of albedo in the near infrared band are compared both in the snow surface and the ice surface Symmetry.The diurnal variation of the albedo over the glacier converges with the diurnal variation of the albedo in the visible wavelength band.At the same time, the paper also analyzes the relationship between the albedo and the density of the snow and the concentration of snowfall, and the albedo Rate change Effects on Runoff.