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| Titel |
Temporal changes in the emissions of CH4 and CO from China estimated from CH4 / CO2 and CO / CO2 correlations observed at Hateruma Island |
| VerfasserIn |
Y. Tohjima, M. Kubo, C. Minejima, H. Mukai, H. Tanimoto, A. Ganshin, S. Maksyutov, K. Katsumata, T. Machida, K. Kita |
| 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 ; 14, no. 3 ; Nr. 14, no. 3 (2014-02-13), S.1663-1677 |
| Datensatznummer |
250118374
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| Publikation (Nr.) |
 copernicus.org/acp-14-1663-2014.pdf |
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| Zusammenfassung |
| In situ observation of the atmospheric CO2, CH4, and CO mixing
ratios at Hateruma Island (HAT, 24.05° N, 123.80° E) often
show synoptic-scale variations with correlative elevations during winter,
associated with air transport from the East Asian countries. We examine
winter (November– March) trends in ΔCH4 / ΔCO2,
ΔCO / ΔCO2, and ΔCO / ΔCH4
observed at Hateruma over the period 1999 to 2010. To investigate the
relationship between the East Asian emissions and the short-term variations
in the atmospheric mixing ratios, we use the FLEXPART Lagrangian particle
dispersion model (LPDM). The observed ratios ΔCH4 / ΔCO2 and ΔCO / ΔCO2 both show an overall gradual
decrease over the study period due to a recent rapid increase in fossil fuel
consumption in China. We note, however, that the decreasing rates of ΔCH4 / ΔCO2 and ΔCO / ΔCO2 show
gradual decrease and increase, respectively, during the entire observation
periods used in this study. The ΔCO / ΔCH4 slope, on the other hand, shows
an increasing trend during 1999–2004 but a decrease during 2005–2010.
Calculation of the concentration footprint for the atmospheric observation at
HAT by using the FLEXPART LPDM indicates that most of the short-term
variations are caused by emission variations from northern and eastern China.
Combined with a set of reported emission maps, we have estimated the temporal
changes in the annual CH4 and CO emissions from China under the
assumption that the estimate of the fossil-fuel-derived CO2 emissions
based on the energy statistics are accurate. The estimated annual CH4
emissions, corresponding to nonseasonal sources or anthropogenic sources
without rice fields, show a nearly constant value of
39 ± 7 TgCH4 yr−1 during 1998–2002, and then gradually
increase to 46 ± 8 TgCH4 yr−1 in 2009/2010. The estimated
annual CO emissions increase from 134 ± 32 TgCO yr−1 in
1998/1999 to 182 ± 42 TgCO yr−1 in 2004/2005, level off after
2005, and then slightly decrease to less than 160 TgCO yr−1 in
2008–2010. |
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