Carbon Dioxide Retrieval from TanSat Observations and Validation with TCCON Measurements
In this study we present the retrieval of the column-averaged dry air mole fraction of carbon dioxide (<i>XCO<sub>2</sub></i>) from the TanSat observations using the ACOS (Atmospheric CO<sub>2</sub> Observations from Space) algorithm. The <i>XCO<sub>2&...
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| Format: | Article |
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MDPI AG
2020-07-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/12/14/2204 |
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| author | Shupeng Wang Ronald J. van der A Piet Stammes Weihe Wang Peng Zhang Naimeng Lu Xingying Zhang Yanmeng Bi Ping Wang Li Fang |
| author_facet | Shupeng Wang Ronald J. van der A Piet Stammes Weihe Wang Peng Zhang Naimeng Lu Xingying Zhang Yanmeng Bi Ping Wang Li Fang |
| author_sort | Shupeng Wang |
| collection | DOAJ |
| description | In this study we present the retrieval of the column-averaged dry air mole fraction of carbon dioxide (<i>XCO<sub>2</sub></i>) from the TanSat observations using the ACOS (Atmospheric CO<sub>2</sub> Observations from Space) algorithm. The <i>XCO<sub>2</sub></i> product has been validated with collocated ground-based measurements from the Total Carbon Column Observing Network (TCCON) for 2 years of TanSat data from 2017 to 2018. Based on the correlation of the <i>XCO<sub>2</sub></i> error over land with goodness of fit in three spectral bands at 0.76, 1.61 and 2.06 μm, we applied an a posteriori bias correction to TanSat retrievals. For overpass averaged results, <i>XCO<sub>2</sub></i> retrievals show a standard deviation (SD) of ~2.45 ppm and a positive bias of ~0.27 ppm compared to collocated TCCON sites. The validation also shows a relatively higher positive bias and variance against TCCON over high-latitude regions. Three cases to evaluate TanSat target mode retrievals are investigated, including one field campaign at Dunhuang with measurements by a greenhouse gas analyzer deployed on an unmanned aerial vehicle and two cases with measurements by a ground-based Fourier-transform spectrometer in Beijing. The results show the retrievals of all footprints, except footprint-6, have relatively low bias (within ~2 ppm). In addition, the orbital <i>XCO<sub>2</sub></i> distributions over Australia and Northeast China between TanSat and the second Orbiting Carbon Observatory (OCO-2) on 20 April 2017 are compared. It shows that the mean <i>XCO<sub>2</sub></i> from TanSat is slightly lower than that of OCO-2 with an average difference of ~0.85 ppm. A reasonable agreement in <i>XCO<sub>2</sub></i> distribution is found over Australia and Northeast China between TanSat and OCO-2. |
| first_indexed | 2024-03-10T18:34:04Z |
| format | Article |
| id | doaj.art-fb7491daec994cdea1a10bcdd3a18e13 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T18:34:04Z |
| publishDate | 2020-07-01 |
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| series | Remote Sensing |
| spelling | doaj.art-fb7491daec994cdea1a10bcdd3a18e132023-11-20T06:24:08ZengMDPI AGRemote Sensing2072-42922020-07-011214220410.3390/rs12142204Carbon Dioxide Retrieval from TanSat Observations and Validation with TCCON MeasurementsShupeng Wang0Ronald J. van der A1Piet Stammes2Weihe Wang3Peng Zhang4Naimeng Lu5Xingying Zhang6Yanmeng Bi7Ping Wang8Li Fang9National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaRoyal Netherlands Meteorological Institute (KNMI), 3731 GA De Bilt, The NetherlandsRoyal Netherlands Meteorological Institute (KNMI), 3731 GA De Bilt, The NetherlandsNational Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaNational Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaNational Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaNational Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaNational Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaRoyal Netherlands Meteorological Institute (KNMI), 3731 GA De Bilt, The NetherlandsAerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, ChinaIn this study we present the retrieval of the column-averaged dry air mole fraction of carbon dioxide (<i>XCO<sub>2</sub></i>) from the TanSat observations using the ACOS (Atmospheric CO<sub>2</sub> Observations from Space) algorithm. The <i>XCO<sub>2</sub></i> product has been validated with collocated ground-based measurements from the Total Carbon Column Observing Network (TCCON) for 2 years of TanSat data from 2017 to 2018. Based on the correlation of the <i>XCO<sub>2</sub></i> error over land with goodness of fit in three spectral bands at 0.76, 1.61 and 2.06 μm, we applied an a posteriori bias correction to TanSat retrievals. For overpass averaged results, <i>XCO<sub>2</sub></i> retrievals show a standard deviation (SD) of ~2.45 ppm and a positive bias of ~0.27 ppm compared to collocated TCCON sites. The validation also shows a relatively higher positive bias and variance against TCCON over high-latitude regions. Three cases to evaluate TanSat target mode retrievals are investigated, including one field campaign at Dunhuang with measurements by a greenhouse gas analyzer deployed on an unmanned aerial vehicle and two cases with measurements by a ground-based Fourier-transform spectrometer in Beijing. The results show the retrievals of all footprints, except footprint-6, have relatively low bias (within ~2 ppm). In addition, the orbital <i>XCO<sub>2</sub></i> distributions over Australia and Northeast China between TanSat and the second Orbiting Carbon Observatory (OCO-2) on 20 April 2017 are compared. It shows that the mean <i>XCO<sub>2</sub></i> from TanSat is slightly lower than that of OCO-2 with an average difference of ~0.85 ppm. A reasonable agreement in <i>XCO<sub>2</sub></i> distribution is found over Australia and Northeast China between TanSat and OCO-2.https://www.mdpi.com/2072-4292/12/14/2204<i>XCO<sub>2</sub></i>TanSatACOSTCCONfull physical retrieval algorithm |
| spellingShingle | Shupeng Wang Ronald J. van der A Piet Stammes Weihe Wang Peng Zhang Naimeng Lu Xingying Zhang Yanmeng Bi Ping Wang Li Fang Carbon Dioxide Retrieval from TanSat Observations and Validation with TCCON Measurements Remote Sensing <i>XCO<sub>2</sub></i> TanSat ACOS TCCON full physical retrieval algorithm |
| title | Carbon Dioxide Retrieval from TanSat Observations and Validation with TCCON Measurements |
| title_full | Carbon Dioxide Retrieval from TanSat Observations and Validation with TCCON Measurements |
| title_fullStr | Carbon Dioxide Retrieval from TanSat Observations and Validation with TCCON Measurements |
| title_full_unstemmed | Carbon Dioxide Retrieval from TanSat Observations and Validation with TCCON Measurements |
| title_short | Carbon Dioxide Retrieval from TanSat Observations and Validation with TCCON Measurements |
| title_sort | carbon dioxide retrieval from tansat observations and validation with tccon measurements |
| topic | <i>XCO<sub>2</sub></i> TanSat ACOS TCCON full physical retrieval algorithm |
| url | https://www.mdpi.com/2072-4292/12/14/2204 |
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