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https://doi.org/10.5194/amt-2017-382
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
10 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
The influence of instrumental line shape degradation on NDACC gas retrievals
Youwen Sun1,3,*, Mathias Palm2,*, Cheng Liu3,4,1, Frank Hase5, David Griffith6, Christine Weinzierl2, Christof Petri2, Wei Wang1, and Justus Notholt2 1Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
2University of Bremen, Institute of Environmental Physics, P.O. Box 330440, 28334 Bremen, Germany
3Center f or Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
4University of Science and Technology of China, Hefei, 230026, China
5Karlsruhe Institute of Technology (KIT), Institute for Meteorology and Climate Research (IMK-ASF), Karlsruhe, Germany
6School of Chemistry, University of Wollongong, Northfields Ave, Wollongong, NSW, 2522, Australia
*These authors contributed equally to this work.
Abstract. Instrumental line shape (ILS) degradation can cause significant biases between global FTIR (Fourier transform infrared) networks if not properly treated. Currently, how ILS degradation influences the global NDACC (Network for Detection of Atmospheric Composition Change) gases retrieval and how much ILS deviation is acceptable for each NDACC gas are still not fully quantified. We simulated ILS degradations with respect to typical types of misalignment, and compared their influence on each NDACC gas. The sensitivities of total column, root mean square of fitting residual (RMS), total random uncertainty, total systematic uncertainty, total uncertainty, degrees of freedom for signal (DOFs), and profile with respect to different levels of ILS degradation for all current NDACC gases, i.e., O3, HNO3, HCl, HF, ClONO2, CH4, CO, N2O, C2H6, and HCN, were investigated. The influence of an imperfect ILS on NDACC gases retrieval were assessed, and the consistency under different meteorological conditions and solar zenith angles (SZA) were examined. The study concluded that the influence of ILS degradation can be approximated by the linear sum of individual modulation efficiency (ME) amplitude influence and phase error (PE) influence. The PE influence is of secondary importance compared with the ME amplitude influence. For total column retrieval, the stratospheric gases are more sensitive to ILS degradation than the tropospheric gases. For profile retrieval, the positive ME has more influence on tropospheric gases than the stratospheric gases. In contrast, the negative ME has more influence on stratospheric gases than the tropospheric gases. In order to suppress the influence on total column for ClONO2 and other NDACC gases within 10 % and 1 %, respectively, the permitted maximum ILS degradation for each NDACC gas was deduced (summarized in Table 5).

Citation: Sun, Y., Palm, M., Liu, C., Hase, F., Griffith, D., Weinzierl, C., Petri, C., Wang, W., and Notholt, J.: The influence of instrumental line shape degradation on NDACC gas retrievals, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-382, in review, 2018.
Youwen Sun et al.
Youwen Sun et al.

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Short summary
We simulated Instrumental line shape (ILS) degradations with respect to typical types of misalignment, and compared their influence on each NDACC gas. The requirements to suppress the ILS degradation related biases within a specified accuracy for all NDACC gases were deduced.
We simulated Instrumental line shape (ILS) degradations with respect to typical types of...
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