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Assessment of retrieved N2O, NO2, and HF profiles from the Atmospheric Infrared Ultraspectral Sounder based on simulated spectra

Wang, Hongmei and Li, Xiaoying and Xu, Jian and Zhang, Xingying and Ge, Shule and Chen, Liangfu and Wang, Yapeng and Zhu, Songyan and Miao, Jing and Si, Yidan (2018) Assessment of retrieved N2O, NO2, and HF profiles from the Atmospheric Infrared Ultraspectral Sounder based on simulated spectra. Sensors, 18 (7), pp. 1-20. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/s18072209 ISSN 1424-8220

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Official URL: https://www.mdpi.com/1424-8220/18/7/2209

Abstract

The Atmospheric Infrared Ultraspectral Sounder (AIUS), the first high-resolution (0.02 cm−1) solar occultation sounder, aboard GF5, was launched in May 2018 from China. However, relevant studies about vertical profiles of atmospheric constituents based on its operational data were not conducted until half a year later. Due to an urgent need for Hin-orbit tests, the real spectra (called reference spectra hereafter) were substituted with simulated spectra calculated from the reference forward model (RFM) plus different random noises at different altitudes. In the generation process of the reference spectra for N2O, NO2, and HF species, ACE-FTS (Atmospheric Chemistry Experiment–Fourier Transform Spectrometer instrument on the SCISAT satellite) level 2 products replace corresponding profiles included in the atmospheric background profiles. The optimal estimation method is employed to extract N2O, NO2, and HF profiles in this study. Comparing the retrieved results with ACE-FTS level 2 products, the relative deviations for these three species are calculated. For N2O, the average relative deviation is less than 6% at altitudes below 25 km, while larger deviations are observed in the range of 25–45 km, with the maximum being at ~25%. Additionally, the difference for NO2 is less than 5% in the 20–45 km range, with a larger discrepancy found below 20 km and above 45 km; the maximum deviation reaches ±40%. For HF, the relative deviation is less than 6% for all tangent heights, implying satisfactory retrieval. The vertical resolution, averaging kernel, and number of degrees of freedom are used to assess the retrieval algorithm, which indicate that the retrieved information content is much more attributable to the reference spectra contribution than to the a priori profile. Finally, a large number of retrieval tests are performed for N2O, NO2, and HF in selected areas covering the Arctic region, northern middle latitude, tropics, southern middle latitude, and Antarctic region, and reliable results are obtained. Thus, to a great extent, the algorithm adopted in the AIUS system can process retrievals reliably and precisely.

Item URL in elib:https://elib.dlr.de/123027/
Document Type:Article
Title:Assessment of retrieved N2O, NO2, and HF profiles from the Atmospheric Infrared Ultraspectral Sounder based on simulated spectra
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wang, HongmeiState Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of SciencesUNSPECIFIED
Li, XiaoyingState Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of SciencesUNSPECIFIED
Xu, Jianjian.xu (at) dlr.dehttps://orcid.org/0000-0003-2348-125X
Zhang, XingyingNational Satellite Meteorological Center, China Meteorological AdministrationUNSPECIFIED
Ge, ShuleChina Center for Resources Satellite Data and ApplicationUNSPECIFIED
Chen, LiangfuState Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of SciencesUNSPECIFIED
Wang, YapengState Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of SciencesUNSPECIFIED
Zhu, SongyanState Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of SciencesUNSPECIFIED
Miao, JingState Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of SciencesUNSPECIFIED
Si, YidanState Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of SciencesUNSPECIFIED
Date:9 July 2018
Journal or Publication Title:Sensors
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:18
DOI :10.3390/s18072209
Page Range:pp. 1-20
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1424-8220
Status:Published
Keywords:GF5 AIUS; occultation; retrieval algorithm; microwindow selection; N2O; NO2; HF
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Xu, Dr.-Ing. Jian
Deposited On:15 Nov 2018 11:37
Last Modified:14 Dec 2019 04:27

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