In-Flight Retrieval of SCIAMACHY Instrument Spectral Response Function
In-Flight Retrieval of SCIAMACHY Instrument Spectral Response Function
复制标题
SCIAMACHY 仪器光谱响应函数的飞行中检索
作者：
M. Hamidouche;G. Lichtenberg
仪器光谱响应函数（ISRF）对光谱定标和大气痕量气体反演有重要影响。因此，对ISRF形状及其半高宽（FWHM）及其时间行为的准确了解或精细表征至关重要。为ISRF在地面和飞行中的特性设计一个策略对于未来的任务至关重要，例如哥白尼计划中的光谱成像仪。我们开发了一种算法来检索飞行中的仪器ISRF。我们的方法使用太阳测量在飞行中的仪器，以适应一个参数化的ISRF从地面校准，然后检索的形状和FWHM的实际飞行ISRF。有了这样一种战略，就能够在分光计成像仪飞行任务的调试和运行期间获得和监测国际空间参考频率。我们应用我们的方法检索SCIAMACHY仪器ISRF在其不同的渠道。我们将检索到的数据与地面估计的数据进行了比较。除了在SCIAMACHY通道8中发现的一些特殊性外，ISRF在其他通道中的结果在大多数情况下随着时间的推移相对一致和稳定。
The instrument Spectral Response Function (ISRF) has a strong impact on spectral calibration and the atmospheric trace gases retrievals. An accurate knowledge or a fine characterization of the ISRF shape and its FWHM (Full width at half maximum) as well as its temporal behavior is therefore crucial. Designing a strategy for the characterization of the ISRF both on ground and in-flight is critical for future missions, such as the spectral imagers in the Copernicus program. We developed an algorithm to retrieve the instrument ISRF in-flight. Our method uses solar measurements taken in-flight by the instrument to fit a parameterized ISRF from on ground based calibration, and then retrieves the shape and FWHM of the actual in-flight ISRF. With such a strategy, one would be able to derive and monitor the ISRF during the commissioning and operation of spectrometer imager missions. We applied our method to retrieve the SCIAMACHY instrument ISRF in its different channels. We compared the retrieved ones with the on ground estimated ones. Besides some peculiarities found in SCIAMACHY channel 8, the ISRF results in other channels were relatively consistent and stable over time in most cases.