Seasonal variability as a source of uncertainty in the West Siberian regional CH4 flux upscaling

Sabrekov, A.F.; Runkle, B.R.; Glagolev, M.V.; Kleptsova, I.E.; Maksyutov, S.S.

Авторы: Sabrekov A.F., Runkle B.R.K, Glagolev M.V., Kleptsova I.E., Maksyutov S.S.
Журнал: Environmental Research Letters
Том: 9
Номер: 4
Год издания: 2014
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 045008
DOI: 10.1088/1748-9326/9/4/045008
Аннотация: This study compares seasonal and spatial variations in methane fluxes as sources of uncertainty in regional methane flux upscaling from the wetlands of West Siberia. The study examined variability in summertime methane emissions from boreal peatlands, with a focus on two subtaiga fen sites in the southern part of West Siberia (Novosibirskaya oblast). We measured methane flux, water table depth, air and peat temperature, pH and electric conductivity of peat water during three field campaigns in summer 2011 (9–12 July, 26–28 July and 20–21 August). Fluxes were measured with static chambers at sites chosen to represent two of the most widespread types of wetlands for this climatic zone: soligenous poor fens and topogenous fens. In both sites the water table level acts as the primary control on fluxes. For the poor fen site with good drainage, water table controls methane fluxes on the seasonal scale but not on a local spatial scale; for the fen site with weak drainage and microtopographic relief, the water table controls fluxes on the local spatial scale, but does not drive seasonal variations in the flux magnitude. This difference in hydrology shows the necessity of including detailed wetland type classification schemes into largescale modeling efforts. From these three measurement periods, we estimated the relative seasonal variation in methane emissions as 8% for the fen site and 26% for the poor fen site. These results were compared to estimates of other sources of uncertainty (such as interannual variation and spatial heterogeneity) to show that quantifying seasonal variability is less critical than these other variations for an improved estimate of regional methane fluxes. This research demonstrates and ranks the challenges in upscaling measured wetland methane fluxes across West Siberia and can guide future field campaigns.
Добавил в систему: Глаголев Михаил Владимирович

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Seasonal variability as a source of uncertainty in the West Siberian regional CH4 flux upscalingстатья

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