青藏高原云和大气对被动微波遥感积雪雪深的影响

被引：5

作者：

刘进军

傅云飞

李锐

王雨

符玉云

胡继恒

机构：

[1] 中国科学技术大学地球和空间科学学院

来源：

高原气象 | 2018年 / 02期

关键词：

青藏高原; 微波遥感; 雪深; 大气效应;

D O I：

暂无

中图分类号：

P407.7 [微波大气遥感];

学科分类号：

1404 ;

摘要：

利用AMSR-E（Advanced Microwave Scanning Radiometer-EOS）观测的2002 2011年青藏高原上空大气顶上行微波亮温(TBTOA),经过辐射传输计算,对水汽和非降水云进行订正,推算出相应的高原地表上行亮温(TBSRF)。并用这两组亮温估算了青藏高原地区的雪深SDTOA和SDSRF。通过个例和近10年统计研究发现,低频18.7 GHz亮温几乎不受影响,而大气顶处36.5 GHz亮温明显高于相应的地表亮温。不考虑这一效应,忽略大气的影响将造成青藏高原雪深反演低估(SDTOASRF)。这种低估在多个个例中出现,在多年平均尺度上也很显著,不可忽略。直接用大气顶微波亮温反演雪深,将造成绝对误差2～3 cm。在青藏高原雪深较浅的区域,相对误差很大,为50%80%。而在高原雪深较深的地区,相对误差较小为10%20%。该误差(SDTOA-SDSRF)和云水路径呈较强的负相关（R=-0.45）,敏感性为-0.047 cm·(g·m-2)-1,该误差对冰云的敏感性较低,和水汽的相关性更弱。通过与MODIS雪盖产品比较发现,用地表出射亮温反演的雪深SDSRF与MODIS雪盖产品吻合得更好。

引用

页码：305 / 316

页数：12

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