Global Atmospheric CO2 Concentrations Simulated by GEOS-Chem: Comparison with GOSAT, Carbon Tracker and Ground-Based Measurements
Accurate quantification of the distribution and variability of atmospheric CO2 is crucial for a better understanding of global carbon cycle characteristics and climate change. Model simulation and observations are only two ways to globally estimate CO2 concentrations and fluxes. However, large uncer...
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ftdoajarticles:oai:doaj.org/article:28a60e97cfff453b9ee52982012786db 2023-05-15T17:48:28+02:00 Global Atmospheric CO2 Concentrations Simulated by GEOS-Chem: Comparison with GOSAT, Carbon Tracker and Ground-Based Measurements Yingying Jing Tianxing Wang Peng Zhang Lin Chen Na Xu Ya Ma 2018-05-01T00:00:00Z https://doi.org/10.3390/atmos9050175 https://doaj.org/article/28a60e97cfff453b9ee52982012786db EN eng MDPI AG http://www.mdpi.com/2073-4433/9/5/175 https://doaj.org/toc/2073-4433 2073-4433 doi:10.3390/atmos9050175 https://doaj.org/article/28a60e97cfff453b9ee52982012786db Atmosphere, Vol 9, Iss 5, p 175 (2018) GEOS-Chem model GOSAT satellite CarbonTracker XCO2 Meteorology. Climatology QC851-999 article 2018 ftdoajarticles https://doi.org/10.3390/atmos9050175 2022-12-31T02:29:37Z Accurate quantification of the distribution and variability of atmospheric CO2 is crucial for a better understanding of global carbon cycle characteristics and climate change. Model simulation and observations are only two ways to globally estimate CO2 concentrations and fluxes. However, large uncertainties still exist. Therefore, quantifying the differences between model and observations is rather helpful for reducing their uncertainties and further improving model estimations of global CO2 sources and sinks. In this paper, the GEOS-Chem model was selected to simulate CO2 concentration and then compared with the Greenhouse Gases Observing Satellite (GOSAT) observations, CarbonTracker (CT) and the Total Carbon Column Observing Network (TCCON) measurements during 2009–2011 for quantitatively evaluating the uncertainties of CO2 simulation. The results revealed that the CO2 simulated from GEOS-Chem is in good agreement with other CO2 data sources, but some discrepancies exist including: (1) compared with GOSAT retrievals, modeled XCO2 from GEOS-Chem is somewhat overestimated, with 0.78 ppm on average; (2) compared with CT, the simulated XCO2 from GEOS-Chem is slightly underestimated at most regions, although their time series and correlation show pretty good consistency; (3) compared with the TCCON sites, modeled XCO2 is also underestimated within 1 ppm at most sites, except at Garmisch, Karlsruhe, Sodankylä and Ny-Ålesund. Overall, the results demonstrate that the modeled XCO2 is underestimated on average, however, obviously overestimated XCO2 from GEOS-Chem were found at high latitudes of the Northern Hemisphere in summer. These results are helpful for understanding the model uncertainties as well as to further improve the CO2 estimation. Article in Journal/Newspaper Ny Ålesund Ny-Ålesund Sodankylä Directory of Open Access Journals: DOAJ Articles Ny-Ålesund Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) Atmosphere 9 5 175 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
GEOS-Chem model GOSAT satellite CarbonTracker XCO2 Meteorology. Climatology QC851-999 |
spellingShingle |
GEOS-Chem model GOSAT satellite CarbonTracker XCO2 Meteorology. Climatology QC851-999 Yingying Jing Tianxing Wang Peng Zhang Lin Chen Na Xu Ya Ma Global Atmospheric CO2 Concentrations Simulated by GEOS-Chem: Comparison with GOSAT, Carbon Tracker and Ground-Based Measurements |
topic_facet |
GEOS-Chem model GOSAT satellite CarbonTracker XCO2 Meteorology. Climatology QC851-999 |
description |
Accurate quantification of the distribution and variability of atmospheric CO2 is crucial for a better understanding of global carbon cycle characteristics and climate change. Model simulation and observations are only two ways to globally estimate CO2 concentrations and fluxes. However, large uncertainties still exist. Therefore, quantifying the differences between model and observations is rather helpful for reducing their uncertainties and further improving model estimations of global CO2 sources and sinks. In this paper, the GEOS-Chem model was selected to simulate CO2 concentration and then compared with the Greenhouse Gases Observing Satellite (GOSAT) observations, CarbonTracker (CT) and the Total Carbon Column Observing Network (TCCON) measurements during 2009–2011 for quantitatively evaluating the uncertainties of CO2 simulation. The results revealed that the CO2 simulated from GEOS-Chem is in good agreement with other CO2 data sources, but some discrepancies exist including: (1) compared with GOSAT retrievals, modeled XCO2 from GEOS-Chem is somewhat overestimated, with 0.78 ppm on average; (2) compared with CT, the simulated XCO2 from GEOS-Chem is slightly underestimated at most regions, although their time series and correlation show pretty good consistency; (3) compared with the TCCON sites, modeled XCO2 is also underestimated within 1 ppm at most sites, except at Garmisch, Karlsruhe, Sodankylä and Ny-Ålesund. Overall, the results demonstrate that the modeled XCO2 is underestimated on average, however, obviously overestimated XCO2 from GEOS-Chem were found at high latitudes of the Northern Hemisphere in summer. These results are helpful for understanding the model uncertainties as well as to further improve the CO2 estimation. |
format |
Article in Journal/Newspaper |
author |
Yingying Jing Tianxing Wang Peng Zhang Lin Chen Na Xu Ya Ma |
author_facet |
Yingying Jing Tianxing Wang Peng Zhang Lin Chen Na Xu Ya Ma |
author_sort |
Yingying Jing |
title |
Global Atmospheric CO2 Concentrations Simulated by GEOS-Chem: Comparison with GOSAT, Carbon Tracker and Ground-Based Measurements |
title_short |
Global Atmospheric CO2 Concentrations Simulated by GEOS-Chem: Comparison with GOSAT, Carbon Tracker and Ground-Based Measurements |
title_full |
Global Atmospheric CO2 Concentrations Simulated by GEOS-Chem: Comparison with GOSAT, Carbon Tracker and Ground-Based Measurements |
title_fullStr |
Global Atmospheric CO2 Concentrations Simulated by GEOS-Chem: Comparison with GOSAT, Carbon Tracker and Ground-Based Measurements |
title_full_unstemmed |
Global Atmospheric CO2 Concentrations Simulated by GEOS-Chem: Comparison with GOSAT, Carbon Tracker and Ground-Based Measurements |
title_sort |
global atmospheric co2 concentrations simulated by geos-chem: comparison with gosat, carbon tracker and ground-based measurements |
publisher |
MDPI AG |
publishDate |
2018 |
url |
https://doi.org/10.3390/atmos9050175 https://doaj.org/article/28a60e97cfff453b9ee52982012786db |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Ny-Ålesund Sodankylä |
geographic_facet |
Ny-Ålesund Sodankylä |
genre |
Ny Ålesund Ny-Ålesund Sodankylä |
genre_facet |
Ny Ålesund Ny-Ålesund Sodankylä |
op_source |
Atmosphere, Vol 9, Iss 5, p 175 (2018) |
op_relation |
http://www.mdpi.com/2073-4433/9/5/175 https://doaj.org/toc/2073-4433 2073-4433 doi:10.3390/atmos9050175 https://doaj.org/article/28a60e97cfff453b9ee52982012786db |
op_doi |
https://doi.org/10.3390/atmos9050175 |
container_title |
Atmosphere |
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9 |
container_issue |
5 |
container_start_page |
175 |
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1766154549342502912 |