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乌兰布和沙漠湖泊变化与气候关系

, PP. 168-174

Keywords: 湖泊面积,气候变化,气温,蒸发量,CBERS卫星,乌兰布和沙漠

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Abstract:

基于卫星和气候数据,以内蒙古乌兰布和沙漠湖泊为研究对象,采用中巴资源卫星2000-2008年长时间序列的影像数据,通过最佳波段组合和时相的选取,用一景同期TM图像作为辅助数据,进行高精度几何配准和镶嵌以及边缘信息提取等处理,绘制湖面变化解译图。为避免个别年份湖面变化出现的偶然性,采用几个相邻年份湖面求取平均值的方法统计近年湖面面积。对研究区20年气象资料的距平值曲线拟合,进行典型湖泊与气候变化的时间序列分析。结果表明湖泊面积与年平均气温和蒸发量呈显著负相关,与年平均降雨量具有极显著的正相关,与相对湿度相关程度较低。湖泊面积越小,对气候变化的敏感性越强,此研究揭示了湖泊与气候变化的动态关系,反映遥感方法在沙漠湖泊水域,尤其是内蒙古西部沙漠湖泊变化检测方面具有较高的实用价值。

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