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| Titel |
A satellite data driven biophysical modeling approach for estimating northern peatland and tundra CO2 and CH4 fluxes |
| VerfasserIn |
J. D. Watts, J. S. Kimball, F. J. W. Parmentier, T. Sachs, J. Rinne, D. Zona, W. Oechel, T. Tagesson, M. Jackowicz-Korczyñski, M. Aurela |
| 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 ; 11, no. 7 ; Nr. 11, no. 7 (2014-04-09), S.1961-1980 |
| Datensatznummer |
250117352
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| Publikation (Nr.) |
 copernicus.org/bg-11-1961-2014.pdf |
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| Zusammenfassung |
| The northern terrestrial net ecosystem carbon balance (NECB) is contingent on
inputs from vegetation gross primary productivity (GPP) to offset the
ecosystem respiration (Reco) of carbon dioxide (CO2) and
methane (CH4) emissions, but an effective framework to monitor the
regional Arctic NECB is lacking. We modified a terrestrial carbon flux (TCF)
model developed for satellite remote sensing applications to evaluate wetland
CO2 and CH4 fluxes over pan-Arctic eddy covariance (EC) flux tower
sites. The TCF model estimates GPP, CO2 and CH4 emissions using in
situ or remote sensing and reanalysis-based climate data as inputs. The TCF
model simulations using in situ data explained > 70% of the r2
variability in the 8 day cumulative EC measured fluxes. Model simulations
using coarser satellite (MODIS) and reanalysis (MERRA) records accounted for
approximately 69% and 75% of the respective r2 variability in
the tower CO2 and CH4 records, with corresponding RMSE
uncertainties of ≤ 1.3 g C m−2 d−1 (CO2) and
18.2 mg C m−2 d−1 (CH4). Although the estimated annual
CH4 emissions were small (< 18 g C m−2 yr−1) relative
to Reco (> 180 g C m−2 yr−1), they reduced the
across-site NECB by 23% and contributed to a global warming potential of
approximately 165 ± 128 g CO2eq m−2 yr−1 when
considered over a 100 year time span. This model evaluation indicates a
strong potential for using the TCF model approach to document landscape-scale
variability in CO2 and CH4 fluxes, and to estimate the NECB for
northern peatland and tundra ecosystems. |
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