Journal of Applied Remote SensingAnalysis of spatiotemporal snow cover variations in Northeast China based on moderate-resolution-imaging spectroradiometer data
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In this study, MODIS/Terra 8-day snow cover product (MOD10A2) was used to analyze the spatiotemporal characteristics of snow cover in northeast China for the period 2002-2011. For those MOD10A2 data with cloud cover more than 10%, the combined MOD10A2 and MYD10A2 (MODIS/Aqua) snow cover products were used. The results indicated that the snow cover area was greatest at 63% in January. The greatest extent and duration of snow cover were observed in 2010, and the opposite extremes occurred in 2008. The snow cover frequency (SCF) was relatively high in high-altitude areas, such as the Hulun Buir Plateau, the northern Da Hinggan Mountains, and the eastern Changbai Mountains; by contrast, the SCF was low in the Liaodong Peninsula. Trends in the snow cover frequencies were essentially opposite to the spatial distribution of the snow cover; the SCF decreased in areas with more snow and increased in areas with less snow. There was a clear variation in the snow accumulation, with lower temperatures in December, January, and February, where a negative relationship existed between the SCF and monthly average temperature below 0°C. Snow cover frequencies during the winter months were slightly positively correlated with precipitation.