Real-Time Measurement of Atmospheric CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O above Rice Fields Based on Laser Heterodyne Radiometers (LHR)
High-precision observations provide an efficient way to calculate greenhouse gas emissions from agricultural fields and their spatial and temporal distributions. Two high-resolution laser heterodyne radiometers (LHRs) were deployed in the suburb of Hefei (31.9°N 117.16°E) for the remote sensing of a...
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MDPI AG
2023-01-01
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| Series: | Agronomy |
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| Online Access: | https://www.mdpi.com/2073-4395/13/2/373 |
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| author | Jun Li Zhengyue Xue Yue Li Guangyu Bo Fengjiao Shen Xiaoming Gao Jian Zhang Tu Tan |
| author_facet | Jun Li Zhengyue Xue Yue Li Guangyu Bo Fengjiao Shen Xiaoming Gao Jian Zhang Tu Tan |
| author_sort | Jun Li |
| collection | DOAJ |
| description | High-precision observations provide an efficient way to calculate greenhouse gas emissions from agricultural fields and their spatial and temporal distributions. Two high-resolution laser heterodyne radiometers (LHRs) were deployed in the suburb of Hefei (31.9°N 117.16°E) for the remote sensing of atmospheric CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O above rice paddy fields. The atmospheric transmittance spectra of CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O were measured simultaneously in real time, and the atmospheric total column abundance was retrieved from the measured data based on the optimal estimation algorithm, with errors of 0.7 ppm, 4 ppb and 2 ppb, respectively. From July to October, the abundance of CO<sub>2</sub> in the atmospheric column that was influenced by emissions from rice fields increased by 0.7 ppm CH<sub>4</sub> by 30 ppb, and by 4 ppb N<sub>2</sub>O. During the rice growth season, rice paddy fields play a role in carbon sequestration. CH<sub>4</sub> and N<sub>2</sub>O emissions from paddy fields are negatively correlated. The method of baking rice paddy fields reduces CH<sub>4</sub> emissions from rice fields, but N<sub>2</sub>O emissions from rice fields are usually subsequently increased. The measurement results showed that LHRs are highly accurate in monitoring atmospheric concentrations and have promising applications in monitoring emissions from rice paddy fields. In the observation period, rice paddy fields can sequester carbon, and CH<sub>4</sub> and N<sub>2</sub>O emissions from rice fields are negatively correlated. The LHRs have strong application prospects for monitoring emissions from agricultural fields. |
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| language | English |
| last_indexed | 2024-03-11T09:16:53Z |
| publishDate | 2023-01-01 |
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| series | Agronomy |
| spelling | doaj.art-517434a683dd41f8bbf4b5202b2756a92023-11-16T18:33:39ZengMDPI AGAgronomy2073-43952023-01-0113237310.3390/agronomy13020373Real-Time Measurement of Atmospheric CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O above Rice Fields Based on Laser Heterodyne Radiometers (LHR)Jun Li0Zhengyue Xue1Yue Li2Guangyu Bo3Fengjiao Shen4Xiaoming Gao5Jian Zhang6Tu Tan7School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230031, ChinaSchool of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230031, ChinaSchool of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230031, ChinaAnhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaSchool of Advanced Manufacturing Engineering, Hefei University, Hefei 230601, ChinaSchool of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230031, ChinaFaculty of Agronomy, Jilin Agricultural University, Changchun 130108, ChinaAnhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaHigh-precision observations provide an efficient way to calculate greenhouse gas emissions from agricultural fields and their spatial and temporal distributions. Two high-resolution laser heterodyne radiometers (LHRs) were deployed in the suburb of Hefei (31.9°N 117.16°E) for the remote sensing of atmospheric CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O above rice paddy fields. The atmospheric transmittance spectra of CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O were measured simultaneously in real time, and the atmospheric total column abundance was retrieved from the measured data based on the optimal estimation algorithm, with errors of 0.7 ppm, 4 ppb and 2 ppb, respectively. From July to October, the abundance of CO<sub>2</sub> in the atmospheric column that was influenced by emissions from rice fields increased by 0.7 ppm CH<sub>4</sub> by 30 ppb, and by 4 ppb N<sub>2</sub>O. During the rice growth season, rice paddy fields play a role in carbon sequestration. CH<sub>4</sub> and N<sub>2</sub>O emissions from paddy fields are negatively correlated. The method of baking rice paddy fields reduces CH<sub>4</sub> emissions from rice fields, but N<sub>2</sub>O emissions from rice fields are usually subsequently increased. The measurement results showed that LHRs are highly accurate in monitoring atmospheric concentrations and have promising applications in monitoring emissions from rice paddy fields. In the observation period, rice paddy fields can sequester carbon, and CH<sub>4</sub> and N<sub>2</sub>O emissions from rice fields are negatively correlated. The LHRs have strong application prospects for monitoring emissions from agricultural fields.https://www.mdpi.com/2073-4395/13/2/373laser heterodyne radiometercarbon dioxidemethanenitrous oxidefield measurement |
| spellingShingle | Jun Li Zhengyue Xue Yue Li Guangyu Bo Fengjiao Shen Xiaoming Gao Jian Zhang Tu Tan Real-Time Measurement of Atmospheric CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O above Rice Fields Based on Laser Heterodyne Radiometers (LHR) Agronomy laser heterodyne radiometer carbon dioxide methane nitrous oxide field measurement |
| title | Real-Time Measurement of Atmospheric CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O above Rice Fields Based on Laser Heterodyne Radiometers (LHR) |
| title_full | Real-Time Measurement of Atmospheric CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O above Rice Fields Based on Laser Heterodyne Radiometers (LHR) |
| title_fullStr | Real-Time Measurement of Atmospheric CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O above Rice Fields Based on Laser Heterodyne Radiometers (LHR) |
| title_full_unstemmed | Real-Time Measurement of Atmospheric CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O above Rice Fields Based on Laser Heterodyne Radiometers (LHR) |
| title_short | Real-Time Measurement of Atmospheric CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O above Rice Fields Based on Laser Heterodyne Radiometers (LHR) |
| title_sort | real time measurement of atmospheric co sub 2 sub ch sub 4 sub and n sub 2 sub o above rice fields based on laser heterodyne radiometers lhr |
| topic | laser heterodyne radiometer carbon dioxide methane nitrous oxide field measurement |
| url | https://www.mdpi.com/2073-4395/13/2/373 |
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