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| Titel |
Decadal trends in global CO emissions as seen by MOPITT |
| VerfasserIn |
Y. Yin, F. Chevallier, P. Ciais, G. Broquet, A. Fortems-Cheiney, I. Pison, M. Saunois |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 23 ; Nr. 15, no. 23 (2015-12-07), S.13433-13451 |
| Datensatznummer |
250120204
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| Publikation (Nr.) |
 copernicus.org/acp-15-13433-2015.pdf |
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| Zusammenfassung |
| Negative trends of carbon monoxide (CO) concentrations are observed in the
recent decade by both surface measurements and satellite retrievals over many
regions of the globe, but they are not well explained by current emission
inventories. Here, we analyse the observed CO concentration decline with an
atmospheric inversion that simultaneously optimizes the two main CO sources
(surface emissions and atmospheric hydrocarbon oxidations) and the main CO
sink (atmospheric hydroxyl radical OH oxidation). Satellite CO column
retrievals from Measurements of Pollution in the Troposphere (MOPITT),
version 6, and surface observations of methane and methyl chloroform mole
fractions are assimilated jointly for the period covering 2002–2011.
Compared to the model simulation prescribed with prior emission inventories,
trends in the optimized CO concentrations show better agreement with that of
independent surface in situ measurements. At the global scale, the
atmospheric inversion primarily interprets the CO concentration decline as a
decrease in the CO emissions (−2.3 % yr−1), more than twice the
negative trend estimated by the prior emission inventories
(−1.0 % yr−1). The spatial distribution of the inferred decrease
in CO emissions indicates contributions from western Europe
(−4.0 % yr−1), the United States (−4.6 % yr−1) and
East Asia (−1.2 % yr−1), where anthropogenic fuel combustion
generally dominates the overall CO emissions, and also from Australia
(−5.3 % yr−1), the Indo-China Peninsula
(−5.6 % yr−1), Indonesia (−6.7 % y−1), and South
America (−3 % yr−1), where CO emissions are mostly due to biomass
burning. In contradiction with the bottom-up inventories that report an
increase of 2 % yr−1 over China during the study period, a
significant emission decrease of 1.1 % yr−1 is inferred by the
inversion. A large decrease in CO emission factors due to technology
improvements would outweigh the increase in carbon fuel combustions and may
explain this decrease. Independent satellite formaldehyde (CH2O) column
retrievals confirm the absence of large-scale trends in the atmospheric
source of CO. However, it should be noted that the CH2O retrievals are
not assimilated and OH concentrations are optimized at a very large scale in
this study. |
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