念青唐古拉山脉西段雪线高度变化遥感观测

利用Landsat TM/ETM+/8 OLI和HJ1A遥感影像资料作为数据源,通过目视解译方法,提取念青唐古拉山脉西段雪线高度变化值,同时对研究区周边气温与降水变化趋势进行分析,研究其与冰川变化的关系。结果表明：2004~2013年北坡13条冰川和南坡15条冰川的雪线高度都呈升高的趋势;从整体上来考察,北坡雪线高度升高值为14 m/a,南坡升高值为4.9 m/a,北坡升高速度比南坡快;自1964年以来,研究区气温升高趋势显著,降水增加不明显,气候变暖是冰川退缩的主要原因;北坡冰川比南坡冰川经历更大的物质负平衡,主要是由于气温的升高率北坡比南坡快所致。

Changes of Snow Line Altitude for Glaciers on Western Nyainqentanglha Range Observed by Remote Sensing

Glaciers in the Tibetan Plateau have experienced change in recent decades with the climate change, and the change trend were not homogeneous. The variation of snow line altitude (SLA) can indicate the glacier change. The changes of SLA for glaciers in the western Nyainqentanglha Range can be detected by remote sensing images obtained at the end of ablation season, such as Landsat TM/ETM+/8 OLI and HJ1A images, when eye interpretation technologywere used to extract snow line. Meanwhile, the variation trend of temperature and precipitation recorded by 4 meteorological stations adjacent to the research area were analyzed, so as to find its influence on glacier change. The results showed that SLA of total studied 28 glaciers rose obviously in 2004-2013. SLA on north slope as a whole raised 14 m/a, while 4.9 m/a on south slope. The air temperature in the studied area rose obviously, precipitation rose slowly since 1964. Climate warming is the main cause for glacier recession. Glaciers on north slope experienced more negative mass balance than south slope, because the rate of air temperature increase on the north is higher than that on the south.