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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Study on Influences of Atmospheric Factors on Vertical $mbox{CO}_{2} $ Profile Retrieving From Ground-Based DIAL at 1.6 μm
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Study on Influences of Atmospheric Factors on Vertical $mbox{CO}_{2} $ Profile Retrieving From Ground-Based DIAL at 1.6 μm

机译：大气因素对垂直 $ mbox {CO} _ {2} $ 地面反演的影响的研究基于DIAL的1.6μm

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摘要

Differential absorption lidar (DIAL) is widely accepted as the most promising remote sensing means to map the global concentrations. Nevertheless, diurnal variations and vertical distributions of atmospheric cannot be obtained by satellite-borne and airborne measurements. Ground-based DIAL systems are developed to fill this gap, as well as serve as validations for satellite-borne measurements. Atmospheric factors play significant roles in obtaining accurate range-resolved measurements of . However, the influence of atmospheric factors on the performance of a ground-based DIAL system aiming at measurements has not been dedicatedly discussed yet. The pressure, temperature, and water vapor of the atmosphere have been taken into consideration for performance evaluation after preselection of absorption lines around 1.6 μm in this paper. In addition, errors caused by variations of aerosols have also been analyzed by using theoretical simulations and real measurements. We found that biases caused by temperature and pressure uncertainties were 0.11–0.45 ppm/K and 0.39 ppm/hPa, respectively, if the central wavelength was utilized as the online wavelength. In addition, the water vapor effect could be neglected by cautious selection of online and offline wavelength. Finally, if the online and offline wavelengths were transmitted alternatively, the temporal and range resolutions have to be determined very carefully to balance the signal-to-noise ratio of acquired data and tolerable errors derived from variations of aerosols. A variable range resolution is recommended for measurements at different altitudes to fulfill the target precision.
机译：差分吸收激光雷达（DIAL）被公认为是绘制全球浓度最有希望的遥感手段。然而，通过卫星和机载测量无法获得大气的日变化和垂直分布。开发了地面DIAL系统来填补这一空白，并用作对卫星测量的验证。大气因素在获得的精确范围分辨测量值中起着重要作用。但是，尚未专门讨论大气因素对基于地面的DIAL系统进行测量的影响。在预先选择约1.6μm的吸收线后，已经考虑了大气的压力，温度和水蒸气进行性能评估。此外，还通过使用理论模拟和实际测量来分析由气溶胶变化引起的误差。我们发现，如果将中心波长用作在线波长，则由温度和压力不确定性引起的偏差分别为0.11-0.45 ppm / K和0.39 ppm / hPa。另外，谨慎选择在线和离线波长可以忽略水蒸气效应。最后，如果交替传输在线和离线波长，则必须非常仔细地确定时间和距离分辨率，以平衡所采集数据的信噪比和源自气溶胶变化的可容忍误差。建议在不同高度进行测量时使用可变范围的分辨率，以达到目标精度。

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