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| Titel |
Temperature drives inter-annual variability of growing season CO2 and CH4 fluxes of Siberian lowland tundra |
| VerfasserIn |
Lars Kutzbach, Christian Wille, Benjamin Runkle, Peter Schreiber, Torsten Sachs, Moritz Langer, Julia Boike, Eva-Maria Pfeiffer |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112180
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| Publikation (Nr.) |
 EGU/EGU2015-12337.pdf |
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| Zusammenfassung |
| Due to the logistic and technical difficulties associated with experimental work in high
latitudes, long-term measurements of CO2 and CH4 fluxes from arctic ecosystems are still
rare, and published trace gas balances often rely on measurements from one or few growing
seasons. The inter-annual variability of environmental conditions such as temperature,
precipitation, snow cover, and timing of snow melt can be high in the Arctic, especially for
regions which are influenced by both continental and maritime climates, such as
the Siberian arctic lowlands. For these ecosystems, we must also expect a great
inter-annual variability in the balance of trace gases. Multi-annual data sets are needed to
investigate this variability and its drivers. Here we present multi-annual late summer
CO2 and CH4 flux data from the Lena River Delta in the Siberian Arctic (72Ë N,
126Ë E). The study site Samoylov Island is characterized by polygonal lowland
tundra, a vegetation dominated by mosses and sedges, a soil complex of Glacic,
Turbic and Histic Cryosols, and an active layer depth of on average 0.5 m. Seasonal
flux measurements were carried out with the eddy covariance technique during
the 13-year period 2002 - 2014. Within this period, CO2 flux data overlaps during
37 days (20 July - 25 August) for 12 years, and CH4 flux data overlaps during 25
days (28 July - 21 August) for 9 years. Cumulative net ecosystem CO2 exchange
(NEE) during the late summer overlap period is fairly consistent for 9 out of 12
years with a CO2 uptake of 1.9 ± 0.1 mol m-2. Three years show a clearly smaller
uptake of |
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