Distributed Feedback Interband Cascade Laser Based Laser Heterodyne Radiometer for Column Density of HDO and CH<sub>4</sub> Measurements at Dunhuang, Northwest of China
Remote sensing of HDO and CH<sub>4</sub> could provide valuable information on environmental and climatological studies. In a recent contribution, we reported a 3.53 μm distributed feedback (DFB) inter-band cascade laser (ICL)-based heterodyne radiometer. In the present work, we present...
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MDPI AG
2022-03-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/14/6/1489 |
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| author | Xingji Lu Yinbo Huang Pengfei Wu Dandan Liu Hongliang Ma Guishi Wang Zhensong Cao |
| author_facet | Xingji Lu Yinbo Huang Pengfei Wu Dandan Liu Hongliang Ma Guishi Wang Zhensong Cao |
| author_sort | Xingji Lu |
| collection | DOAJ |
| description | Remote sensing of HDO and CH<sub>4</sub> could provide valuable information on environmental and climatological studies. In a recent contribution, we reported a 3.53 μm distributed feedback (DFB) inter-band cascade laser (ICL)-based heterodyne radiometer. In the present work, we present the details of measurements and inversions of HDO and CH<sub>4</sub> at Dunhuang, Northwest of China. The instrument line shape (ILS) of laser heterodyne radiometer (LHR) is discussed firstly, and the spectral resolution is about 0.004 cm<sup>−1</sup> theoretically according to the ILS. Furthermore, the retrieval algorithm, optimal estimation method (OEM), combined with LBLRTM (Line-by-line Radiative Transfer Model) for retrieving the densities of atmospheric HDO and CH<sub>4</sub> are investigated. The HDO densities were retrieved to be less than 1.0 ppmv, while the CH<sub>4</sub> densities were around 1.79 ppmv from 20 to 24 July 2018. The correlation coefficient of water vapor densities retrieved by LHR and EM27/SUN is around 0.6, the potential reasons for the differences were discussed. Finally, in order to better understand the retrieval procedure, the Jacobian value and the Averaging Kernels are also discussed. |
| first_indexed | 2024-03-09T12:44:44Z |
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| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-09T12:44:44Z |
| publishDate | 2022-03-01 |
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| spelling | doaj.art-46f1771032644411900737956f582be92023-11-30T22:13:50ZengMDPI AGRemote Sensing2072-42922022-03-01146148910.3390/rs14061489Distributed Feedback Interband Cascade Laser Based Laser Heterodyne Radiometer for Column Density of HDO and CH<sub>4</sub> Measurements at Dunhuang, Northwest of ChinaXingji Lu0Yinbo Huang1Pengfei Wu2Dandan Liu3Hongliang Ma4Guishi Wang5Zhensong Cao6Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaCollege of Electrical and Optoelectronic Engineering, West Anhui University, Lu’an 237012, ChinaSchool of Electronic Engineering and Intelligent Manufacturing, Anqing Normal Univesity, Anqing 246011, ChinaKey Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaKey Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaRemote sensing of HDO and CH<sub>4</sub> could provide valuable information on environmental and climatological studies. In a recent contribution, we reported a 3.53 μm distributed feedback (DFB) inter-band cascade laser (ICL)-based heterodyne radiometer. In the present work, we present the details of measurements and inversions of HDO and CH<sub>4</sub> at Dunhuang, Northwest of China. The instrument line shape (ILS) of laser heterodyne radiometer (LHR) is discussed firstly, and the spectral resolution is about 0.004 cm<sup>−1</sup> theoretically according to the ILS. Furthermore, the retrieval algorithm, optimal estimation method (OEM), combined with LBLRTM (Line-by-line Radiative Transfer Model) for retrieving the densities of atmospheric HDO and CH<sub>4</sub> are investigated. The HDO densities were retrieved to be less than 1.0 ppmv, while the CH<sub>4</sub> densities were around 1.79 ppmv from 20 to 24 July 2018. The correlation coefficient of water vapor densities retrieved by LHR and EM27/SUN is around 0.6, the potential reasons for the differences were discussed. Finally, in order to better understand the retrieval procedure, the Jacobian value and the Averaging Kernels are also discussed.https://www.mdpi.com/2072-4292/14/6/1489laser heterodyne radiometerinstrument line-shaperetrieval algorithmHDOCH<sub>4</sub> |
| spellingShingle | Xingji Lu Yinbo Huang Pengfei Wu Dandan Liu Hongliang Ma Guishi Wang Zhensong Cao Distributed Feedback Interband Cascade Laser Based Laser Heterodyne Radiometer for Column Density of HDO and CH<sub>4</sub> Measurements at Dunhuang, Northwest of China Remote Sensing laser heterodyne radiometer instrument line-shape retrieval algorithm HDO CH<sub>4</sub> |
| title | Distributed Feedback Interband Cascade Laser Based Laser Heterodyne Radiometer for Column Density of HDO and CH<sub>4</sub> Measurements at Dunhuang, Northwest of China |
| title_full | Distributed Feedback Interband Cascade Laser Based Laser Heterodyne Radiometer for Column Density of HDO and CH<sub>4</sub> Measurements at Dunhuang, Northwest of China |
| title_fullStr | Distributed Feedback Interband Cascade Laser Based Laser Heterodyne Radiometer for Column Density of HDO and CH<sub>4</sub> Measurements at Dunhuang, Northwest of China |
| title_full_unstemmed | Distributed Feedback Interband Cascade Laser Based Laser Heterodyne Radiometer for Column Density of HDO and CH<sub>4</sub> Measurements at Dunhuang, Northwest of China |
| title_short | Distributed Feedback Interband Cascade Laser Based Laser Heterodyne Radiometer for Column Density of HDO and CH<sub>4</sub> Measurements at Dunhuang, Northwest of China |
| title_sort | distributed feedback interband cascade laser based laser heterodyne radiometer for column density of hdo and ch sub 4 sub measurements at dunhuang northwest of china |
| topic | laser heterodyne radiometer instrument line-shape retrieval algorithm HDO CH<sub>4</sub> |
| url | https://www.mdpi.com/2072-4292/14/6/1489 |
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