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Measuring aerosol optical depths from satellite: Aerosol measurements and models.

机译：从卫星测量气溶胶光学深度：气溶胶测量和模型。

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摘要

ne of the primary uncertainties in measuring aerosol optical depths from satellite is in the choice of the aerosol phase function. Various investigators have suggested the ratio of AVHRR channels 1 and 2 could be used to derive a variable phase function suitable for many different aerosol cases. In order to investigate this possibility, a new aerosol model was developed from a large data set of in-situ aerosol size distribution measurements and used to model the satellite response. The model results suggest the ratio of AVHRR channels 1 to 2 can be used to roughly derive the aerosol phase function value. In order to test the modeling results, aerosol optical depths were obtained from satellite images and were compared with ground based sun photometer measurements. Both methods were in reasonable agreement for this study although clouds made exact comparisons difficult.;Error analysis of the aerosol optical depth derived from AVHRR satellites was also performed. The error was found to be dependent on the scattering angle with largest errors occurring near 120 degrees corresponding to the minimum in the aerosol phase function. Sources of error studied here include sun glint, sensor noise, sensor calibration, water vapor absorption for channel 2 and ozone absorption for channel 1. For the scattering angles with the largest errors, near 120 degrees, the one standard deviation errors in the aerosol optical depth were approximately
机译：在测量来自卫星的气溶胶光学深度时的主要不确定因素之一是气溶胶相位函数的选择。各种研究人员已经提出，AVHRR通道1和2的比率可用于得出适用于许多不同气溶胶情况的可变相位函数。为了调查这种可能性，从大量的原位气溶胶尺寸分布测量数据集开发了一种新的气溶胶模型，并将其用于对卫星响应进行建模。模型结果表明，AVHRR通道1与2的比例可用于大致推导气溶胶相函数值。为了测试建模结果，从卫星图像获得了气溶胶光学深度，并将其与基于地面的太阳光度计测量结果进行了比较。尽管云使精确比较变得困难，但是这两种方法在本研究中都处于合理的一致性。;还对源自AVHRR卫星的气溶胶光学深度进行了误差分析。发现该误差取决于散射角，其中最大误差出现在120度附近，这对应于气溶胶相函数中的最小值。此处研究的误差源包括太阳闪烁，传感器噪声，传感器校准，通道2的水蒸气吸收和通道1的臭氧吸收。对于最大误差的散射角（接近120度），气溶胶光学系统的一个标准偏差误差深度大约

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  • 作者

    Porter, John Nolan.;

  • 作者单位

    University of Hawai'i at Manoa.;

  • 授予单位 University of Hawai'i at Manoa.;
  • 学科 Physics Atmospheric Science.;Environmental Sciences.;Physics Radiation.
  • 学位 Ph.D.
  • 年度 1993
  • 页码 142 p.
  • 总页数 142
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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