西北地区近年来内陆湖泊变化反映的气候问题

内陆湖泊是气候变化敏感的指示器，高山湖泊处于自然状态，受人类活动影响较小，能够较真实地反映气候状况，而内陆河尾闻湖变化是自然和人类活动共同作用的结果．利用NOAA／AVHRR、EOS/MODIS卫星资料和相关献资料研究分析了祁连山哈拉湖和大、小苏干湖，黑河下游东居延海、新疆博斯腾湖、塞里本湖和艾比湖面积变化．结果表明，近年来祁连山哈拉湖面积呈逐渐扩大趋势，大、小苏于湖面积变化稳定；2002年是黑河流域降水较多的年份；2002年新疆内陆和高山湖泊面积显增加．预示警这些地区降水增多，冰雪融化加快．内陆湖泊变化应引起人们的关注．

Climate Change Indicated by the Recent Change of Inland Lakes in Northwest China

Inland lakes are sensitive indicators of climate change. High mountain lakes, due to less influence from human activity, can reflect the climate state accurately. On the other hand, the lake at the end of an inland river may change under the effect of both the human activity and the natural variation. In this article, area changes of some inland lakes in Northwest China in recent years were analyzed using data from NOAA/AVHRR and EOS/MODIS. The results show that the Har Lake in higher west part of the Qilian Mountains is expanding; the Big Sugan Lake and the Small Sugan Lake in lower west part of the Qilian Mountains are stable. There is more precipitation in the Heihe valley in 2002. The area of inland and higher mountain lakes in Xinjiang increases notably in 2002. This suggests an increase in precipitation and meltwater of snow and ice in these regions. Attention should be given to these changes.