Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Trace Gas Retrieval from AIUS：Algorithm Description and O3 Retrieval Assessment

Xiaoying Li
,
Tianhai Cheng
* ORCID logo ,
Jian Xu
* ORCID logo ,
Hailiang Shi
,
Xingying Zhang
,
Shule Ge
,
Mingmin Zou
,
Hongmei Wang
,
Yapeng Wang
,
Songyan Zhu
,
Jing Miao
Version 1 : Received: 19 April 2018 / Approved: 20 April 2018 / Online: 20 April 2018 (03:59:10 CEST)

How to cite: Li, X.; Cheng, T.; Xu, J.; Shi, H.; Zhang, X.; Ge, S.; Zou, M.; Wang, H.; Wang, Y.; Zhu, S.; Miao, J. Trace Gas Retrieval from AIUS：Algorithm Description and O3 Retrieval Assessment. Preprints 2018, 2018040257. https://doi.org/10.20944/preprints201804.0257.v1 Li, X.; Cheng, T.; Xu, J.; Shi, H.; Zhang, X.; Ge, S.; Zou, M.; Wang, H.; Wang, Y.; Zhu, S.; Miao, J. Trace Gas Retrieval from AIUS：Algorithm Description and O3 Retrieval Assessment. Preprints 2018, 2018040257. https://doi.org/10.20944/preprints201804.0257.v1

Abstract

AIUS (Atmospheric Infrared Ultraspectral Sounder) is an infrared occultation spectrometer onboard the Chinese GaoFen-5 satellite, which covers a spectral range of 2.4–13.3 μm (750–4100 cm−1) with a spectral resolution of about 0.02 cm−1. AIUS is designed to measure and study chemical processes of ozone (O3) and other trace gases in the upper troposphere and stratosphere around Antarctic. In this study, the corresponding retrieval methodology is described. The retrieval simulations based on the simulated spectra of AIUS have been carried out, with a focus on O3. The relative difference between the retrieved and the true O3 profiles is within 5% from the 15 km to 70 km and about 10% below 15 km. The corresponding averaging kernels illustrate that the overall retrieval information mainly come from the spectra, not the a priori. The retrieval experiments also demonstrate that the shape of the retrieved profiles resembles the shape of the true profile even if the shape of the a priori profile is different from that of the true profile. Further, we perform the O3 retrieval from the real ACE-FTS (Atmospheric Chemistry Experiment-Fourier Transform Spectrometer) measurements and compare the results with the official ACE-FTS Level-2 products. Overall, both profiles agree well in the stratosphere where the retrieval sensitivity is high. The relative difference between both profiles is about 15% below 70 km, which may due to the measurement errors and different forward model parameters.

Keywords

AIUS; occultation; retrieval algorithm; microwindows; ozone

Subject

Environmental and Earth Sciences, Atmospheric Science and Meteorology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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