Aoki Tadao, Aoki Teruo, Fukabori Masashi
Meteorological Research Institute, Tsukuba, Ibaraki, Japan.
Appl Opt. 2002 Aug 20;41(24):4945-57. doi: 10.1364/ao.41.004945.
High-accuracy remote measurement of greenhouse gases is hampered by contamination of the field of view by the path radiance of solar radiation scattered from clouds and aerosols. A method is proposed for eliminating the effect of path radiance by differentiating two components of polarized light. The polarization of path radiance is measured directly at the wave-number region of strong water-vapor absorption. Using this measurement, we eliminate the components of path radiance involved in other bands, which are used for greenhouse gas measurements, by differentiating two components of the polarized light. It is shown that the effect of path radiance on retrieving the column amount of gases potentially can be reduced to below 0.1%.
云和气溶胶散射的太阳辐射的路径辐射会污染视场，这阻碍了温室气体的高精度远程测量。本文提出了一种通过区分偏振光的两个分量来消除路径辐射影响的方法。在强水汽吸收的波数区域直接测量路径辐射的偏振。利用该测量结果，通过区分偏振光的两个分量，我们消除了用于温室气体测量的其他波段中包含的路径辐射分量。结果表明，路径辐射对反演气体柱总量的影响有可能降低到0.1%以下。
