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| Titel |
Modeling methane emissions from Arctic lakes under warming conditions |
| VerfasserIn |
Qianlai Zhuang, Zeli Tan |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250098589
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| Publikation (Nr.) |
 EGU/EGU2014-14280.pdf |
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| Zusammenfassung |
| To investigate the response of methane emissions from arctic lakes, a process-based
climate-sensitive lake methane model is developed. The processes of methane production,
oxidation and transport are modeled within a one-dimensional water and sediment column.
Dynamics of point-source ebullition seeps are explicitly modeled. The model was calibrated
and verified using observational data in the region. The model was further used to estimate
the lake methane emissions from the Arctic from 2002 to 2004. We estimate that the
total amount of methane emissions is 24.9 Tg CH4 yr-1, which is consistent with
a recent estimation of 24±10 Tg CH4 yr-1 and two-fold of methane emissions
from natural wetlands in the north of 60 oN. The methane emission rate of lakes
spatially varies over high latitudes from 170.5 mg CH4 m-2 day-1 in northern
Siberia to only 10.1 mg CH4 m-2 day-1 in northern Europe. A projection assuming
2-7.5oC warming and 15-25% expansion of lake coverage shows that the total amount
of methane emitted from Arctic lakes will increase to 29.8-35.6 Tg CH4 yr-1. |
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