Impact of Improved Corrections for MIPAS Detector Non-Linearity
Impact of Improved Corrections for MIPAS Detector Non-Linearity
复制标题
改进 MIPAS 探测器非线性校正的影响
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
G. Wagner
中科院分区：
文献类型：
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作者：
Michael T. Kiefer;G. Aubertin;M. Birk;M. D. Laurentis;E. Eckert;A. Kleinert;G. Perron;G. Wagner
五个MIPAS/Envisat光谱带中的三个是由具有非线性光子通量响应的探测器测量的。在对光谱进行变换之前，必须在干涉图中校正这种非线性。IPF5版本之前的运行L1B数据使用一组固定的非线性校正进行处理，这些校正是从任务开始前的仪器特性中推导出来的。然而，探测器受到老化的影响，即可以预期校正会随着时间的变化而变化。在MIPAS QWG的框架中，根据飞行中的测量得出了一组新的依赖时间的非线性校正，并将在未来版本的L1B处理器中使用。两个分别为11个轨道的测试数据集已被处理到L1B，使用针对第一个数据集的操作NL校正和针对第二个数据集的新的依赖时间的NL校正。讨论了随时间变化的NL改正对L2数据产品的影响。这取决于搜寻目标和海拔高度。对于臭氧，新数据和运行数据的差异与MIPAS O3数据中发现的漂移大致一致，与其他仪器相比。
Three of the five MIPAS/Envisat spectral bands are measured by detectors with a non-linear photon flux response. This non-linearity has to be corrected in the interferogram before the transformation to the spectrum is performed. Operational L1b data up to version IPF5 is processed with one fixed set of non-linearity corrections, which have been deduced from an instrument characterisation before mission start. However, the detectors are affected by ageing, i.e. the corrections can be expected to change in time. In the frame of the MIPAS QWG a new set of time dependent non-linearity corrections were deduced from in-flight measurements, and will be used in future versions of the L1b processor. Two test sets of data of eleven orbits each have been processed to L1b using the operational NL-corrections for the first and the new time dependent NL-corrections for the second data set. The impact of the time dependent NL-corrections on L2 data products is discussed. It depends on retrieval target and altitude. For Ozone differences of the new and the operational data are roughly consistent with drifts found in MIPAS O3 data compared to other instruments.