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祁连山和首都圈卫星热红外背景场变化特征

DOI: 10.6046/gtzyyg.2013.03.23, PP. 138-144

Keywords: 卫星热红外遥感,首都圈,祁连山,背景场,时空变化特征

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Abstract:

掌握非震情况下的热红外亮温背景场及其时空变化规律是有效提取地震红外异常信息的关键。利用2003—2011年NOAA卫星夜间热红外遥感数据构建祁连山和首都圈亮温背景场,分析其时空演化特征。结果表明:红外亮温背景场受季节、地形和断裂活动等多种因素的影响,其中受季节变化影响最大,年变规律明显;不同地理环境,亮温年变特征呈现不同形式,对于地形地貌复杂的地区,亮温变化曲线不稳定,红外亮温与地面高程呈显著的负相关关系,地面高程每增加100m,亮温降低约0.21~0.63℃,这与我国气温直减率基本一致;活动断裂带在红外图像上表现为明显的高亮温线性条带或亮温分界带;多年平均背景场平滑了气候等突变信息,呈现出稳定性较强的规律性变化特征,为断裂活动和地震所引起的增温异常检测提供了稳定的亮温变化基准场。

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