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| Titel |
Impacts of climate and reclamation on temporal variations in CH4 emissions from different wetlands in China: from 1950 to 2010 |
| VerfasserIn |
T. Li, W. Zhang, Q. Zhang, Y. Lu, G. Wang, Z. Niu, M. Raivonen, T. Vesala |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 23 ; Nr. 12, no. 23 (2015-12-01), S.6853-6868 |
| Datensatznummer |
250118186
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| Publikation (Nr.) |
 copernicus.org/bg-12-6853-2015.pdf |
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| Zusammenfassung |
| Natural wetlands are among the most important sources of atmospheric methane
and thus important for better understanding the long-term temporal
variations in the atmospheric methane concentration. During the last 60
years, wetlands have experienced extensive conversion and impacts from
climate warming which might result in complicated temporal and spatial
variations in the changes of the wetland methane emissions. In this paper,
we present a modeling framework, integrating CH4MODwetland,
TOPMODEL, and TEM models, to analyze the temporal and spatial variations in CH4
emissions from natural wetlands (including inland marshes/swamps, coastal
wetlands, lakes, and rivers) in China. Our analysis revealed a total increase
of 25.5 %, averaging 0.52 g m−2 per decade, in the national CH4
fluxes from 1950 to 2010, which was mainly induced by climate warming.
Larger CH4 flux increases occurred in northeastern, northern, and
northwestern China, where there have been higher temperature rises. However,
decreases in precipitation due to climate warming offset the increment of
CH4 fluxes in these regions. The CH4 fluxes from the wetland on
the Qinghai–Tibet Plateau exhibited the lowest CH4 increase (0.17 g m−2 per decade). Although climate warming has accelerated CH4
fluxes, the total amount of national CH4 emissions decreased by
approximately 2.35 Tg (1.91–2.81 Tg), i.e., from 4.50 Tg in the early 1950s
to 2.15 Tg in the late 2000s, due to the wetland loss totalling 17.0 million ha. Of this reduction, 0.26 Tg (0.24–0.28 Tg) was derived from
lakes and rivers, 0.16 Tg (0.13–0.20 Tg) from coastal wetlands, and 1.92 Tg (1.54–2.33 Tg) from inland wetlands. Spatially, northeastern
China contributed the most to the total reduction, with a loss of 1.68 Tg.
The wetland CH4 emissions reduced by more than half in most regions in
China except for the Qinghai–Tibet Plateau, where the CH4 decrease
was only 23.3 %. |
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