Preflight Evaluation of the Environmental Trace Gases Monitoring Instrument with Nadir and Limb Modes (EMI-NL) Based on Measurements of Standard NO<sub>2</sub> Sample Gas
Hyperspectral observations are used to retrieve high-resolution horizontal distribution and vertical profiles of trace gases (O<sub>3</sub>, NO<sub>2</sub>, HCHO, and SO<sub>2</sub>), thereby playing a vital role in monitoring the spatio-temporal distribution and...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/14/22/5886 |
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| author | Taiping Yang Fuqi Si Haijin Zhou Minjie Zhao Fang Lin Lei Zhu |
| author_facet | Taiping Yang Fuqi Si Haijin Zhou Minjie Zhao Fang Lin Lei Zhu |
| author_sort | Taiping Yang |
| collection | DOAJ |
| description | Hyperspectral observations are used to retrieve high-resolution horizontal distribution and vertical profiles of trace gases (O<sub>3</sub>, NO<sub>2</sub>, HCHO, and SO<sub>2</sub>), thereby playing a vital role in monitoring the spatio-temporal distribution and transportation of atmospheric pollutants. These observations reflect air quality changes on global and regional scales, including China, thereby elucidating the impacts of anthropogenic and natural emissions on atmospheric composition and global climate change. The DaQi 02 (DQ02) satellite carries the Environmental Trace Gases Monitoring Instrument with Nadir and Limb modes (EMI-NL) onboard, which will simultaneously perform nadir and limb measurements of high-resolution ultraviolet and visible solar scattered light in the nadir and limb directions. Combined with the absorption of different trace gases in this wavelength band, this information can provide high-resolution horizontal and vertical distributions of trace gases. We examined the spectral measuring ability and instrument characteristics of both modules of EMI-NL by measuring different light sources and concentrations of the NO<sub>2</sub> sample gas. In the nadir module test, when the NO<sub>2</sub> sample gas concentration was 198 ppm and 513 ppm with scattered sunlight as the light source, the average relative errors of spatial pixels were 4.02% and 3.64%, respectively. At the NO<sub>2</sub> sample gas concentration of 198 ppm with the integrating sphere as the light source, the average relative error of spatial pixels was −2.26%. In the limb module test, when the NO<sub>2</sub> sample gas concentration was 198 ppm and 1000 ppm with the tungsten halogen lamp as the light source, the average relative errors of spatial pixels were −3.07% and 8.32%, respectively. When the NO<sub>2</sub> sample gas concentration was 198 ppm and 1000 ppm with the integrating sphere as the light source, the spatial pixel average errors were −3.5% and 8.06%, respectively. The retrieved NO<sub>2</sub> slant column density between different spatial pixels exhibited notable inconsistency in both modules, which could be used to estimate the stripe of spatial dimension. These results confirm the ability of EMI-NL to provide accurate spaceborne monitoring of NO<sub>2</sub> globally. |
| first_indexed | 2024-03-09T18:02:16Z |
| format | Article |
| id | doaj.art-aad0b72198334389a66bd00552ea2372 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-09T18:02:16Z |
| publishDate | 2022-11-01 |
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| series | Remote Sensing |
| spelling | doaj.art-aad0b72198334389a66bd00552ea23722023-11-24T09:52:01ZengMDPI AGRemote Sensing2072-42922022-11-011422588610.3390/rs14225886Preflight Evaluation of the Environmental Trace Gases Monitoring Instrument with Nadir and Limb Modes (EMI-NL) Based on Measurements of Standard NO<sub>2</sub> Sample GasTaiping Yang0Fuqi Si1Haijin Zhou2Minjie Zhao3Fang Lin4Lei Zhu5Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, ChinaHyperspectral observations are used to retrieve high-resolution horizontal distribution and vertical profiles of trace gases (O<sub>3</sub>, NO<sub>2</sub>, HCHO, and SO<sub>2</sub>), thereby playing a vital role in monitoring the spatio-temporal distribution and transportation of atmospheric pollutants. These observations reflect air quality changes on global and regional scales, including China, thereby elucidating the impacts of anthropogenic and natural emissions on atmospheric composition and global climate change. The DaQi 02 (DQ02) satellite carries the Environmental Trace Gases Monitoring Instrument with Nadir and Limb modes (EMI-NL) onboard, which will simultaneously perform nadir and limb measurements of high-resolution ultraviolet and visible solar scattered light in the nadir and limb directions. Combined with the absorption of different trace gases in this wavelength band, this information can provide high-resolution horizontal and vertical distributions of trace gases. We examined the spectral measuring ability and instrument characteristics of both modules of EMI-NL by measuring different light sources and concentrations of the NO<sub>2</sub> sample gas. In the nadir module test, when the NO<sub>2</sub> sample gas concentration was 198 ppm and 513 ppm with scattered sunlight as the light source, the average relative errors of spatial pixels were 4.02% and 3.64%, respectively. At the NO<sub>2</sub> sample gas concentration of 198 ppm with the integrating sphere as the light source, the average relative error of spatial pixels was −2.26%. In the limb module test, when the NO<sub>2</sub> sample gas concentration was 198 ppm and 1000 ppm with the tungsten halogen lamp as the light source, the average relative errors of spatial pixels were −3.07% and 8.32%, respectively. When the NO<sub>2</sub> sample gas concentration was 198 ppm and 1000 ppm with the integrating sphere as the light source, the spatial pixel average errors were −3.5% and 8.06%, respectively. The retrieved NO<sub>2</sub> slant column density between different spatial pixels exhibited notable inconsistency in both modules, which could be used to estimate the stripe of spatial dimension. These results confirm the ability of EMI-NL to provide accurate spaceborne monitoring of NO<sub>2</sub> globally.https://www.mdpi.com/2072-4292/14/22/5886environmental trace gases monitoring instrument with nadir and limb modules (EMI-NL)preflight evaluationnadir modulelimb moduleNO<sub>2</sub> |
| spellingShingle | Taiping Yang Fuqi Si Haijin Zhou Minjie Zhao Fang Lin Lei Zhu Preflight Evaluation of the Environmental Trace Gases Monitoring Instrument with Nadir and Limb Modes (EMI-NL) Based on Measurements of Standard NO<sub>2</sub> Sample Gas Remote Sensing environmental trace gases monitoring instrument with nadir and limb modules (EMI-NL) preflight evaluation nadir module limb module NO<sub>2</sub> |
| title | Preflight Evaluation of the Environmental Trace Gases Monitoring Instrument with Nadir and Limb Modes (EMI-NL) Based on Measurements of Standard NO<sub>2</sub> Sample Gas |
| title_full | Preflight Evaluation of the Environmental Trace Gases Monitoring Instrument with Nadir and Limb Modes (EMI-NL) Based on Measurements of Standard NO<sub>2</sub> Sample Gas |
| title_fullStr | Preflight Evaluation of the Environmental Trace Gases Monitoring Instrument with Nadir and Limb Modes (EMI-NL) Based on Measurements of Standard NO<sub>2</sub> Sample Gas |
| title_full_unstemmed | Preflight Evaluation of the Environmental Trace Gases Monitoring Instrument with Nadir and Limb Modes (EMI-NL) Based on Measurements of Standard NO<sub>2</sub> Sample Gas |
| title_short | Preflight Evaluation of the Environmental Trace Gases Monitoring Instrument with Nadir and Limb Modes (EMI-NL) Based on Measurements of Standard NO<sub>2</sub> Sample Gas |
| title_sort | preflight evaluation of the environmental trace gases monitoring instrument with nadir and limb modes emi nl based on measurements of standard no sub 2 sub sample gas |
| topic | environmental trace gases monitoring instrument with nadir and limb modules (EMI-NL) preflight evaluation nadir module limb module NO<sub>2</sub> |
| url | https://www.mdpi.com/2072-4292/14/22/5886 |
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