西藏纳木错湖泊面积变化对气候变化的响应

Response of Namtso Lake Area Change to Climate Change in Tibet

本文根据1975年地形图、多源卫星数据以及气象资料分析纳木错湖面面积、湖面高度变化。结果表明,1975—2017年,纳木错湖面面积总体扩张了64.68km^2,扩张率为3.32%。2003—2009年,纳木错湖泊面积和湖面高度均呈现增长和上升趋势,湖泊面积增长了17.2km2、湖面高度上升了1.2m。综合分析表明,纳木错流域近47年来气温升高,降水量增加;同时暖季降水量的增加,补给了湖泊水量,而蒸发量减少也抑制了湖水的蒸发。这些要素的变化对纳木错湖泊面积的扩张具有较大影响。

Based on the topographic map, multi-source satellite data and meteorological data of 1975, this paper ana. lyzed the change of lake area and lake height in namuchou. The results showed that from 1975 to 2017, the total area of the lake in Namco expanded by 64.68km2, with an expansion rate of 3.32%. From 2003 to 2009, the lake area and lake height of Namcuo showed an increasing trend. The lake area increased by 17.2km2 and the lake height increased by 1.2m. The comprehensive analysis showed that the temperature of Namcuo basin had increased and the precipita. tion had increased in the past 47 years. At the same time, the increase in precipitation in the warm season restores the amount of water in the lake, and the decrease in evaporation also inhibits the evaporation of the lake. The changes of these factors are helpful to the expansion of the lake area of Namtso.