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CO 2 Flux over the Contiguous United States in 2016 Inverted by WRF-Chem/DART from OCO-2 XCO 2 Retrievals.
In: Remote Sensing, Jg. 13 (2021-08-01), Heft 15, S. 2996-2996
Online
academicJournal
Zugriff:
High spatial resolution carbon dioxide (CO 2 ) flux inversion systems are needed to support the global stocktake required by the Paris Agreement and to complement the bottom-up emission inventories. Based on the work of Zhang, a regional CO 2 flux inversion system capable of assimilating the column-averaged dry air mole fractions of CO 2 (XCO 2 ) retrieved from Orbiting Carbon Observatory-2 (OCO-2) observations had been developed. To evaluate the system, under the constraints of the initial state and boundary conditions extracted from the CarbonTracker 2017 product (CT2017), the annual CO 2 flux over the contiguous United States in 2016 was inverted (1.08 Pg C yr −1 ) and compared with the corresponding posterior CO 2 fluxes extracted from OCO-2 model intercomparison project (OCO-2 MIP) (mean: 0.76 Pg C yr −1 , standard deviation: 0.29 Pg C yr −1 , 9 models in total) and CT2017 (1.19 Pg C yr −1 ). The uncertainty of the inverted CO 2 flux was reduced by 14.71% compared to the prior flux. The annual mean XCO 2 estimated by the inversion system was 403.67 ppm, which was 0.11 ppm smaller than the result (403.78 ppm) simulated by a parallel experiment without assimilating the OCO-2 retrievals and closer to the result of CT2017 (403.29 ppm). Independent CO 2 flux and concentration measurements from towers, aircraft, and Total Carbon Column Observing Network (TCCON) were used to evaluate the results. Mean bias error (MBE) between the inverted CO 2 flux and flux measurements was 0.73 g C m −2 d −1 , was reduced by 22.34% and 28.43% compared to those of the prior flux and CT2017, respectively. MBEs between the CO 2 concentrations estimated by the inversion system and concentration measurements from TCCON, towers, and aircraft were reduced by 52.78%, 96.45%, and 75%, respectively, compared to those of the parallel experiment. The experiment proved that CO 2 emission hotspots indicated by the inverted annual CO 2 flux with a relatively high spatial resolution of 50 km consisted well with the locations of most major metropolitan/urban areas in the contiguous United States, which demonstrated the potential of combing satellite observations with high spatial resolution CO 2 flux inversion system in supporting the global stocktake. [ABSTRACT FROM AUTHOR]
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Titel: |
CO 2 Flux over the Contiguous United States in 2016 Inverted by WRF-Chem/DART from OCO-2 XCO 2 Retrievals.
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Autor/in / Beteiligte Person: | Zhang, Qinwei ; Li, Mingqi ; Wang, Maohua ; Mizzi, Arthur Paul ; Huang, Yongjian ; Wei, Chong ; Jin, Jiuping ; Gu, Qianrong |
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Zeitschrift: | Remote Sensing, Jg. 13 (2021-08-01), Heft 15, S. 2996-2996 |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 2072-4292 (print) |
DOI: | 10.3390/rs13152996 |
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