基于MOD10A1 的祁连山黑河流域典型冰川反照率时空变化研究

doi:10.13866/j.azr.2020.06.04

摘要/Abstract

摘要： 冰川反照率作为影响辐射收支最为敏感的要素，其波动变化将直接影响冰川能量—物质平衡的变化。利用遥感手段研究冰川反照率特征和时空分布规律，对于估算冰川消融乃至下游河川径流具有重要参考依据。本文以MOD10A1逐日反照率产品和Landsat TM/ETM+影像反照率反演结果为主要数据源，用实测数据进行Landsat TM/ ETM+反演反照率和MOD10A1产品反照率的误差分析；进而分析黑河流域典型冰川2000—2018年MOD10A1产品反照率的时空变化特征。结果表明，MOD10A1与自动气象站测得的实测反照率差异较大，但两者随时间的变化趋势一致；MOD10A1与Landsat TM/ETM+反演结果差异较小，在黑河流域冰川反照率的研究中具有较好的适用性。在年际尺度上，4条冰川反照率均呈现微弱的下降趋势，空间尺度上，八一冰川年平均反照率最高，羊龙河五号冰川次之，七一冰川次低，十一冰川最低；消融季冰川反照率羊龙河五号冰川最高，七一冰川次之，八一冰川次低，十一冰川最低。

关键词: 冰川反照率, 黑河流域, MOD10A1, Landsat TM/ETM+, 时空分布

Abstract: Glacier albedo is a critical parameter that controls the process of radiation budget, the fluctuation of which directly affects the change in glacier energy-mass balance. By remote sensing, studies on the characteristics of glacier albedo and its spatiotemporal distribution can be taken as an important reference for estimating glacier melting and downstream river runoff. In this study, albedo dataset retrieved from Landsat TM/ETM+ images and MOD10A1 daily albedo product were used as the main data sources, and Landsat TM/ETM+ images and MOD10A1 data’error were analyzed by field measurements. Then, the spatiotemporal variations of albedo were investigated on four representative glaciers in Heihe River Basin of MOD10A1 from 2000 to 2018. The results showed that there was a certain bias between albedo value derived from MOD10A1 products and ground measured, but the time series was similar; there is a difference in inversion results between MOD10A1 and Landsat TM/ETM+, suggesting a good applicability of glacier albedo in Heihe River Basin. On the interannual scale, the albedo of four glaciers was decreasing. Among the spatial scale, the annual average albedo of Bayi glacier was the highest, followed by Yanglonghe glacier No. 5, Qiyi glacier, and Shiyi glacier; the average albedo of Yanglonghe glacier No. 5 was the highest in the ablation season, followed by the Qiyi glacier, Bayi glacier, and Shiyi glacier.

王俊瑶, 怀保娟, 王叶堂, 孙维君, 张悟颖. 基于MOD10A1 的祁连山黑河流域典型冰川反照率时空变化研究[J]. 干旱区研究, 2020, 37(6): 1396-1405.

WANG Jun-yao, HUAI Bao-juan, WANG Ye-tang, SUN Wei-jun, ZHANG Wu-ying. Spatiotemporal variation of albedo of four representative glaciers in the Heihe River Basin based on multi-source data[J]. Arid Zone Research, 2020, 37(6): 1396-1405.

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