Assessment of Retrieved N2O, NO2, and HF Profiles from the Atmospheric Infrared Ultraspectral Sounder Based on Simulated Spectra
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 unti...
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ftdoajarticles:oai:doaj.org/article:a28a7a92e35b4d5289abb3ea674403ba 2023-05-15T13:49:36+02:00 Assessment of Retrieved N2O, NO2, and HF Profiles from the Atmospheric Infrared Ultraspectral Sounder Based on Simulated Spectra Hongmei Wang Xiaoying Li Jian Xu Xingying Zhang Shule Ge Liangfu Chen Yapeng Wang Songyan Zhu Jing Miao Yidan Si 2018-07-01T00:00:00Z https://doi.org/10.3390/s18072209 https://doaj.org/article/a28a7a92e35b4d5289abb3ea674403ba EN eng MDPI AG http://www.mdpi.com/1424-8220/18/7/2209 https://doaj.org/toc/1424-8220 1424-8220 doi:10.3390/s18072209 https://doaj.org/article/a28a7a92e35b4d5289abb3ea674403ba Sensors, Vol 18, Iss 7, p 2209 (2018) GF5 AIUS occultation retrieval algorithm microwindow selection N2O NO2 HF Chemical technology TP1-1185 article 2018 ftdoajarticles https://doi.org/10.3390/s18072209 2022-12-30T20:42:57Z 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 ... Article in Journal/Newspaper Antarc* Antarctic Arctic Directory of Open Access Journals: DOAJ Articles Antarctic Arctic Sensors 18 7 2209 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
GF5 AIUS occultation retrieval algorithm microwindow selection N2O NO2 HF Chemical technology TP1-1185 |
spellingShingle |
GF5 AIUS occultation retrieval algorithm microwindow selection N2O NO2 HF Chemical technology TP1-1185 Hongmei Wang Xiaoying Li Jian Xu Xingying Zhang Shule Ge Liangfu Chen Yapeng Wang Songyan Zhu Jing Miao Yidan Si Assessment of Retrieved N2O, NO2, and HF Profiles from the Atmospheric Infrared Ultraspectral Sounder Based on Simulated Spectra |
topic_facet |
GF5 AIUS occultation retrieval algorithm microwindow selection N2O NO2 HF Chemical technology TP1-1185 |
description |
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 ... |
format |
Article in Journal/Newspaper |
author |
Hongmei Wang Xiaoying Li Jian Xu Xingying Zhang Shule Ge Liangfu Chen Yapeng Wang Songyan Zhu Jing Miao Yidan Si |
author_facet |
Hongmei Wang Xiaoying Li Jian Xu Xingying Zhang Shule Ge Liangfu Chen Yapeng Wang Songyan Zhu Jing Miao Yidan Si |
author_sort |
Hongmei Wang |
title |
Assessment of Retrieved N2O, NO2, and HF Profiles from the Atmospheric Infrared Ultraspectral Sounder Based on Simulated Spectra |
title_short |
Assessment of Retrieved N2O, NO2, and HF Profiles from the Atmospheric Infrared Ultraspectral Sounder Based on Simulated Spectra |
title_full |
Assessment of Retrieved N2O, NO2, and HF Profiles from the Atmospheric Infrared Ultraspectral Sounder Based on Simulated Spectra |
title_fullStr |
Assessment of Retrieved N2O, NO2, and HF Profiles from the Atmospheric Infrared Ultraspectral Sounder Based on Simulated Spectra |
title_full_unstemmed |
Assessment of Retrieved N2O, NO2, and HF Profiles from the Atmospheric Infrared Ultraspectral Sounder Based on Simulated Spectra |
title_sort |
assessment of retrieved n2o, no2, and hf profiles from the atmospheric infrared ultraspectral sounder based on simulated spectra |
publisher |
MDPI AG |
publishDate |
2018 |
url |
https://doi.org/10.3390/s18072209 https://doaj.org/article/a28a7a92e35b4d5289abb3ea674403ba |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Sensors, Vol 18, Iss 7, p 2209 (2018) |
op_relation |
http://www.mdpi.com/1424-8220/18/7/2209 https://doaj.org/toc/1424-8220 1424-8220 doi:10.3390/s18072209 https://doaj.org/article/a28a7a92e35b4d5289abb3ea674403ba |
op_doi |
https://doi.org/10.3390/s18072209 |
container_title |
Sensors |
container_volume |
18 |
container_issue |
7 |
container_start_page |
2209 |
_version_ |
1766251837949739008 |