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基于MODIS 500 m分辨率数据,利用MODTRAN 4+模型和可见光波段、近红外波段的波段比方法反演雪粒径,建立1个消融期内的雪粒径变化的时间序列,通过采集七一冰川上设立的观测点对应时间段内雪粒径验证MODIS模拟的雪粒径值,结合位于观测点附近的气象站的气温数据,探讨气温对雪粒径的影响。结果表明,雪粒径的增长存在着明显的日变化趋势;模拟的雪粒径普遍高于实测的雪粒径值,因此反演模型需要约为1.1倍的校正因子;气温对雪粒径的影响显著。
Based on the MODIS 500 m resolution data, the snow particle size was retrieved using the MODTRAN 4+ model and the band-to-infrared ratio in the visible and near-infrared bands. A time series of snow particle size changes during the ablation period was established. The corresponding observation points are validated by MODIS simulation of snow particle size within the corresponding period of time, and combined with the temperature data of the weather stations located near the observation points, the effects of temperature on snow particle size are discussed. The results show that there is a clear diurnal variation trend of snow particle size. The simulated snow particle size is generally higher than the measured snow particle size value, so the inversion model needs about 1.1 times of correction factor. Significant impact.