...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >A novel approach to the polarization correction of spaceborne spectrometers - art. no. 4229
【24h】

A novel approach to the polarization correction of spaceborne spectrometers - art. no. 4229

机译：星载光谱仪偏振校正的新方法-艺术没有。 4229

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

1] We present a new polarization correction algorithm for polarization sensitive spaceborne spectrometers like Global Ozone Monitoring Experiment (GOME) or Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY). These instruments measure polarization with less spectral resolution than the radiance. As a consequence, the current GOME polarization correction algorithm allows radiance errors of 10% in the UV and 3% in the visible (VIS) and near-IR. Using simulated spectra, we show that the continuum Stokes elements Q and U over a large wavelength range (300 to 800 nm) can be reliably retrieved from only a limited set of measurements (three to five). The interpolation to other wavelengths is made using numerically calculated polarization spectra. These polarization spectra can be calculated for Rayleigh scattering atmospheres, but we show that the retrieval is just as effective for cloudy and aerosol scenes as for clear scenes. For GOME the remaining radiance errors are less than 3% (UV) and 1% (VIS, near-IR), and often smaller than 0.5%. The lack of actual UV (300-330 nm) polarization measurements prevents further reduction of the radiance errors. We also show how the ozone Huggins absorption band may be accounted for through a parameterization and a single polarization broadband measurement and that strong but narrow absorption bands like the O(2)A band maybe ignored without detrimental effect on the algorithm. [References: 27
机译：1]我们为极化敏感的星载光谱仪（如全球臭氧监测实验（GOME）或大气成像扫描成像吸收光谱仪（SCIAMACHY））提出了一种新的偏振校正算法。这些仪器以比辐射更低的光谱分辨率测量极化。结果，当前的GOME偏振校正算法允许UV的辐射误差为10％，可见光（VIS）和近红外的辐射误差为3％。使用模拟光谱，我们表明可以从有限的一组测量值（三到五个）中可靠地检索出大波长范围（300至800 nm）中的连续斯托克斯元素Q和U。使用数值计算的偏振光谱对其他波长进行插值。这些极化光谱可以针对瑞利散射大气进行计算，但是我们证明，对于阴天和气溶胶场景而言，这种检索与在晴朗场景中一样有效。对于GOME，其余的辐射误差小于3％（UV）和1％（VIS，近红外），通常小于0.5％。缺少实际的UV（300-330 nm）偏振测量结果，无法进一步降低辐射误差。我们还展示了如何通过参数化和单极化宽带测量来解决臭氧Huggins吸收带的问题，强而窄的吸收带（如O（2）A吸收带）可能会被忽略，而对算法没有不利影响。 [参考：27

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号