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| Titel |
Large scale, regional, CH4 and net CO2 fluxes using nested chamber, tower, aircraft flux, remote sensing, and modeling approaches in Arctic Alaska |
| VerfasserIn |
Walter Oechel, Virginie Moreaux, Aram Kalhori, Salvatore Losacco, Patrick Murphy, Eric Wilkman, Donatella Zona |
| 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 |
250091053
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| Publikation (Nr.) |
 EGU/EGU2014-5320.pdf |
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| Zusammenfassung |
| The topographic, environmental, biotic, and metabolic heterogeneity of terrestrial ecosystems
and landscapes can be large even despite a seemingly homogeneous landscape. The error of
estimating and simulating fluxes due to extant heterogeneity is commonly overlooked
in regional and global estimates. We evaluate the pattern and controls on spatial
heterogeneity on GHG fluxes over varying spatial scales and compare to standard
estimates of NEE and other greenhouse gas fluxes. Data from the north slope of
Alaska from up to a 16 year flux record from up to 7 permanent towers, over 20
portable tower locations, and hundreds of hours of aircraft fluxes, are used to evaluate
the spatial variability of fluxes and to better estimate regional fluxes. Significant
heterogeneity of fluxes is identified at varying scales from sub-meter scale to >100km.
A careful consideration of the effect that heterogeneity causes when estimating
ecosystem fluxes is critical to reliable regional and global estimates. The combination of
tower, flux aircraft, remote sensing, and modeling can be used to provide reliable,
accurate, regional assessments of CH4and CO2 fluxes or large areas of heterogeneous
landscape. |
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