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Studying the spatiotemporal variation of snow-covered days over China based on combined use of MODIS snow-covered days and in situ observations

机译：基于MODIS冰雪覆盖天数与原位观测的结合研究中国冰雪覆盖天数的时空变化

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摘要

Based on the moderate resolution imaging spectro-adiometer (MODIS)-acquired snow-covered days data (MSCD), validation of MSCD is performed by using 529 in situ observations of snow-covered days (SCD) from 2001 to 2006 in China. For the different characteristics of snow cover in four major snow-covered regions including the Tibetan Plateau, Xinjiang, and north-eastern and inner Mongolia, the validation process is divided into five parts for all of China. Our results indicate that except in the south-eastern part of the Tibetan Plateau, the MSCD is usually lower than the in situ SCD measurement. It is found that the MSCD have good polynomial regression agreement with the in situ measurements in Xinjiang and north-eastern and inner Mongolia with an R2 values that reach 0.89, 0.78, and 0.87, respectively. Because the MSCD is smaller but with a good regression relationship with the in situ SCD, calibration of the MSCD images could significantly improve its precision in those regions. To be considered a stable snow-covered area, there must be greater than 60 days per year in which the pixels are covered by snow. Unstable snow-covered areas are ones in which fewer than 60 days but at least 1 day is covered by snow. The calibrated MSCD outcome indicates that the unstable snow-covered area can reach 555.2×10~4 km~2, and the stable snow-covered area is approximately 273.1 × 10~4 km~2. The area in the three major stable snow-covered regions of the Tibetan Plateau, Xinjiang, and north-eastern and inner Mongolia is approximately 100.4× 10~4, 54.4 × 10~4, and 114.7×10~4 km~2, respectively.
机译：基于中分辨率成像光谱仪（MODIS）获得的积雪天数数据（MSCD），通过对529个中国2001年至2006年积雪天数（SCD）进行现场观测，对MSCD进行了验证。由于青藏高原，新疆，东北和内蒙古等四个主要积雪地区的积雪特征不同，整个中国的验证过程分为五个部分。我们的结果表明，除了青藏高原的东南部，MSCD通常低于原位SCD测量值。结果表明，在新疆，东北东北部和内蒙古，MSCD与原位测量具有良好的多项式回归一致性，R2值分别达到0.89、0.78和0.87。由于MSCD较小，但与原位SCD具有良好的回归关系，因此MSCD图像的校准可以显着提高这些区域的精度。要被视为稳定的积雪区域，每年必须有60天以上的像素被雪覆盖。不稳定的大雪覆盖区域是少于60天但至少有1天被雪覆盖的区域。校准后的MSCD结果表明，不稳定的积雪面积可以达到555.2×10〜4 km〜2，稳定的积雪面积约为273.1×10〜4 km〜2。青藏高原，新疆，东北和内蒙古的三个主要稳定积雪地区的面积分别约为100.4×10〜4、54.4×10〜4和114.7×10〜4 km〜2。 。

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  • 来源
    《Theoretical and applied climatology》 |2011年第4期|p.355-363|共9页
  • 作者

    Junfeng Liu; Rensheng Chen;

  • 作者单位

    Heihe Upstream Watershed Ecology-Hydrology, Experimental Research Station, CAREERI, CAS, Lanzhou, Gansu 730000, China,Heihe Key Laboratory of Ecohydrology and Integrated, River Basin Science, CAREERI, CAS, Lanzhou, Gansu 730000, China;

    Heihe Upstream Watershed Ecology-Hydrology, Experimental Research Station, CAREERI, CAS, Lanzhou, Gansu 730000, China,Heihe Key Laboratory of Ecohydrology and Integrated, River Basin Science, CAREERI, CAS, Lanzhou, Gansu 730000, China;

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