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Assessment of Spectra of the Atmospheric Infrared Ultraspectral Sounder on GF-5 and Validation of Water Vapor Retrieval
Atmospheric Infrared Ultraspectral Sounder (AIUS) aboard the Chinese GaoFen-5 satellite was launched on 9 May 2018. It is the first hyperspectral occultation spectrometer in China. The spectral quality assessment of AIUS measurements at the full and representative spectral bands was presented by com...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7825146/ https://www.ncbi.nlm.nih.gov/pubmed/33418883 http://dx.doi.org/10.3390/s21020325 |
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author | Cao, Xifeng Li, Xiaoying Liu, Shuanghui Zhang, Xinyuan |
author_facet | Cao, Xifeng Li, Xiaoying Liu, Shuanghui Zhang, Xinyuan |
author_sort | Cao, Xifeng |
collection | PubMed |
description | Atmospheric Infrared Ultraspectral Sounder (AIUS) aboard the Chinese GaoFen-5 satellite was launched on 9 May 2018. It is the first hyperspectral occultation spectrometer in China. The spectral quality assessment of AIUS measurements at the full and representative spectral bands was presented by comparing the transmittance spectra of measurements with that of simulations. AIUS measurements agree well with simulations. Statistics show that more than 73% of the transmittance differences are within ±0.05 and more than 91% of the transmittance differences are within ±0.1. The spectral windows for O [Formula: see text] , H [Formula: see text] O, temperature, CO, CH [Formula: see text] , and HCl were also analyzed. The comparison experiments indicate that AIUS data can provide reliable data for O [Formula: see text] , H [Formula: see text] O, temperature, CO, CH [Formula: see text] , and HCl detection and dynamic monitoring. The H [Formula: see text] O profiles were then retrieved from AIUS measurements, and the precision, resolution, and accuracy of the H [Formula: see text] O profiles are discussed. The estimated precision is less than 1.3 ppmv (21%) below 57 km and about 0.9–2.4 ppmv (20–31%) at 60–90 km. The vertical resolution of H [Formula: see text] O profiles is better than 5 km below 32 km and about 5–8 km at 35–85 km. Comparisons with MLS Level 2 products indicate that the mean H [Formula: see text] O profiles of AIUS have a good agreement with those of MLS. The relative differences are mostly within ±10% at 16–75 km and about 10–15% at 16–20 km in 60 [Formula: see text] –80 [Formula: see text] S. For 60 [Formula: see text] –65 [Formula: see text] S in December, the relative differences are within ±5% between 22 km and 80 km. The H [Formula: see text] O profiles retrieved from AIUS measurements are credible for scientific research. |
format | Online Article Text |
id | pubmed-7825146 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-78251462021-01-24 Assessment of Spectra of the Atmospheric Infrared Ultraspectral Sounder on GF-5 and Validation of Water Vapor Retrieval Cao, Xifeng Li, Xiaoying Liu, Shuanghui Zhang, Xinyuan Sensors (Basel) Article Atmospheric Infrared Ultraspectral Sounder (AIUS) aboard the Chinese GaoFen-5 satellite was launched on 9 May 2018. It is the first hyperspectral occultation spectrometer in China. The spectral quality assessment of AIUS measurements at the full and representative spectral bands was presented by comparing the transmittance spectra of measurements with that of simulations. AIUS measurements agree well with simulations. Statistics show that more than 73% of the transmittance differences are within ±0.05 and more than 91% of the transmittance differences are within ±0.1. The spectral windows for O [Formula: see text] , H [Formula: see text] O, temperature, CO, CH [Formula: see text] , and HCl were also analyzed. The comparison experiments indicate that AIUS data can provide reliable data for O [Formula: see text] , H [Formula: see text] O, temperature, CO, CH [Formula: see text] , and HCl detection and dynamic monitoring. The H [Formula: see text] O profiles were then retrieved from AIUS measurements, and the precision, resolution, and accuracy of the H [Formula: see text] O profiles are discussed. The estimated precision is less than 1.3 ppmv (21%) below 57 km and about 0.9–2.4 ppmv (20–31%) at 60–90 km. The vertical resolution of H [Formula: see text] O profiles is better than 5 km below 32 km and about 5–8 km at 35–85 km. Comparisons with MLS Level 2 products indicate that the mean H [Formula: see text] O profiles of AIUS have a good agreement with those of MLS. The relative differences are mostly within ±10% at 16–75 km and about 10–15% at 16–20 km in 60 [Formula: see text] –80 [Formula: see text] S. For 60 [Formula: see text] –65 [Formula: see text] S in December, the relative differences are within ±5% between 22 km and 80 km. The H [Formula: see text] O profiles retrieved from AIUS measurements are credible for scientific research. MDPI 2021-01-06 /pmc/articles/PMC7825146/ /pubmed/33418883 http://dx.doi.org/10.3390/s21020325 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Cao, Xifeng Li, Xiaoying Liu, Shuanghui Zhang, Xinyuan Assessment of Spectra of the Atmospheric Infrared Ultraspectral Sounder on GF-5 and Validation of Water Vapor Retrieval |
title | Assessment of Spectra of the Atmospheric Infrared Ultraspectral Sounder on GF-5 and Validation of Water Vapor Retrieval |
title_full | Assessment of Spectra of the Atmospheric Infrared Ultraspectral Sounder on GF-5 and Validation of Water Vapor Retrieval |
title_fullStr | Assessment of Spectra of the Atmospheric Infrared Ultraspectral Sounder on GF-5 and Validation of Water Vapor Retrieval |
title_full_unstemmed | Assessment of Spectra of the Atmospheric Infrared Ultraspectral Sounder on GF-5 and Validation of Water Vapor Retrieval |
title_short | Assessment of Spectra of the Atmospheric Infrared Ultraspectral Sounder on GF-5 and Validation of Water Vapor Retrieval |
title_sort | assessment of spectra of the atmospheric infrared ultraspectral sounder on gf-5 and validation of water vapor retrieval |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7825146/ https://www.ncbi.nlm.nih.gov/pubmed/33418883 http://dx.doi.org/10.3390/s21020325 |
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