利用星载激光雷达监测大型淡水湖上微粒后向散射系数的评估:在密歇根湖上使用CALIPSO进行的测试

Ray H. Watkins, Michael J. Sayers , Robert A. Shuchman , Karl R. Bosse 
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引用次数: 0

摘要

云-气溶胶激光雷达和红外探路者卫星观测(CALIPSO)卫星于2006年发射,其主要目标是利用激光雷达测量地球大气中云和气溶胶的特性。从那时起,大量的研究表明,使用CALIPSO从太空中观测海洋和大洋地下光学特性的昼夜差异是可行的。到目前为止,还没有研究使用CALIPSO来监测大型淡水湖的地下光学特性。这可能是由于CALIPSO有限的空间分辨率,这使得绘制小于大海的区域的地下性质变得不切实际。尽管如此,CALIPSO确实经过了一些世界上最大的淡水湖,提供了关于水的重要信息。在这里,我们使用整个CALIPSO数据记录(大约15年)来测量整个密歇根湖的颗粒后向散射系数(b bp, m−1)。然后,我们将激光雷达得出的b bp值与MODIS获得的光学图像值和原位测量值进行比较。关键的是,我们发现与光学图像相比,激光雷达得出的bbp在非夏季月份与原位值对齐得更好。然而,由于密歇根湖的高云层覆盖和高风速,CALIPSO产品的可用性受到限制。最后,我们对包括CALIPSO和其他卫星在内的星载激光雷达在未来监测五大湖和其他大型淡水水体方面的作用进行了推测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessment of using spaceborne LiDAR to monitor the particulate backscatter coefficient on large, freshwater lakes: A test using CALIPSO on Lake Michigan
The Cloud-Aerosol LiDAR and Infrared Pathfinder Satellite Observation (CALIPSO) satellite was launched in 2006 with the primary goal of measuring the properties of clouds and aerosols in Earth’s atmosphere using LiDAR. Since then, numerous studies have shown the viability of using CALIPSO to observe day/night differences in subsurface optical properties of oceans and large seas from space. To date no studies have been done on using CALIPSO to monitor the subsurface optical properties of large, freshwater-lakes. This is likely due to the limited spatial resolution of CALIPSO, which makes the mapping of subsurface properties of regions smaller than large seas impractical. Still, CALIPSO does pass over some of the world’s largest, freshwater-lakes, yielding important information about the water. Here we use the entire CALIPSO data record (approximately 15 years) to measure the particulate backscatter coefficient (b bp , m −1) across Lake Michigan. We then compare the LiDAR derived values of b bp to optical imagery values obtained from MODIS and to in situ measurements. Critically, we find that the LiDAR derived b bp aligns better in non-summer months with in situ values when compared to the optically imagery. However, due to both high cloud coverage and high wind speeds on Lake Michigan, this comes with the caveat that the CALIPSO product is limited in its usability. We close by speculating on the roll that spaceborne LiDAR, including CALIPSO and other satitlites, have on the future of monitoring the Great Lakes and other large bodies of fresh water.
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