可可西里湖泊水面面积与雪冰覆盖率相关分析

气候变化对青藏高原湖泊水面面积会产生很大的影响,雪冰覆盖作为气候变化的一个重要因素,也对青藏高原湖泊水面面积有一定的影响。利用遥感影像提取2009—2017年可可西里地区库塞湖及周边四湖(简称为四湖)的年水面面积,同时,利用2005—2016年的MODIS积雪产品,提取四湖集水区雪冰覆盖率,结合同期五道梁气象站点的逐月平均气温数据和降水量,对四湖水面面积变化与集水区雪冰覆盖变化规律及其与五道梁站气温与降水量之间的关系进行探讨。分析表明:1)卓乃湖2011年9月溃决后,4个湖泊的水面面积都发生较大的改变;2)2005—2014年期间,四湖集水区雪冰覆盖率总体呈小幅度增加趋势;3)卓乃湖溃决后,库塞湖及卓乃湖的水面面积与五道梁站年均气温的相关性显著提高,而库塞湖及卓乃湖的水面面积与四湖集水区雪冰覆盖率的相关性显著降低。

Analysis of the correlation between the surface area of lakes in Kekexili region and snow-ice coverage ratio

Climate change has great influence on the surface area of lakes on the Tibetan Plateau. Snow and ice cover, one of the important factors of climate change, also has some influence on the surface area of lakes on the Tibetan plateau. Surface area of Kusai lake and other three surrounding lake in Kekexili area(referred to as the four lakes) from 2009 to 2017 was extracted from the remote sensing images and the snow-ice coverage ratio of the Four Lake watershed from 2005 to 2016 was extracted from MODIS snow products at the same time. Combined with average monthly temperature and monthly precipitation data in Wudaoliang meteorological station, the relationship between variation of the surface area of four lakes and snow-ice coverage ratio in four lakes watershed and air temperature and precipitation in the Wudaoliang meteorological station are discussed. Analysis shows that: the first is: since Zhuonai Lake burst on September 2011 ,the surface area of the four lakes have largely changed. The second is: during the period of 2005-2014, the snow-ice coverage ratio of the four lakes watershed showed a small increasing trend. The third is: after Zhuonai Lake burst, correlation between water area of Kusai Lake or Zhuonai Lake and average annual temperature of Wudaoliang station significantly increased, and correlation between water area of Kusai Lake or Zhuonai Lake and the snow-ice coverage ratio of the four lakes watershed decreased significantly.