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采用地学信息图谱方法,分析了羌塘高原1970—2000年的冰川变化.结果表明:1970—2000年期间,羌塘高原整体呈萎缩趋势,冰川面积退缩的年平均速率(APAC)为0.145%.a-1,年平均退缩面积3.004 km2.a-1,但也有部分冰川处于前进状态.1970—2000年羌塘高原冰川退缩加剧,但与中国西部大部分地区相比,仍是退缩速率较小的地区;整体冰川变化趋势由北向南逐渐增大,但是不同时段不同山地的冰川变化又有所差异.通过分析冰川变化对气候变化的响应可知,气温上升是1970—2000年羌塘高原冰川处于退缩状态的主要原因.对比分析羌塘高原冰川变化实际结果和冰川系统模型的预测结果可知,直线式升温模式下升温速率为0.03 K.a-1时的情形更符合羌塘高原的冰川变化实际情况,也说明冰川系统模型具有可行性.
The change of glacier in the Qiangtang Plateau from 1970 to 2000 was analyzed by geo-information atlas method.The results showed that during 1970-2000, the overall Qiangtang plateau showed a decreasing trend and the annual average rate of glacier shrinkage (APAC) was 0.145%. a-1, the average annual shrinkage area is 3.004 km2.a-1, but some glaciers are still on the way. The retreat of the glaciers in the Qiangtang Plateau intensified in 1970-2000, but compared with that in most of western China, the retreat rate was still small Of the total glaciers in the Qiangtang Plateau, and the overall trend of glacier changes gradually increases from north to south, but the changes of glaciers in different mountainous areas are different in different periods.By analyzing the response of glacial changes to climate change, the temperature rise is from 1970 to 2000 The main reason for the retreating state of the glacier in the Qiangtang Plateau.Comparing the actual results of the glacier changes in the Qiangtang Plateau and the predictions of the glacial system model, it can be seen that the situation of the glacier change in the Qiangtang Plateau is more consistent with the heating rate of 0.03 Ka-1 in the linear warming mode, It also shows that the glacier system model is feasible.