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| Titel |
Using novel Earth observation products to characterise wetland extend and methand dynamics in the Jules Land surface model: the ESA ALANIS-Methane Project |
| VerfasserIn |
G. Hayman, D. Clark, E. Blyth, A. Bartsch, C. Paulik, S. Schlaffer, J. Reschke, C. Prigent, F. Aires, M. Buchwitz, O. Schneising, J. Burrows, F. O'Connor, N. Gedney |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250063650
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| Zusammenfassung |
| The role of wetlands in the global methane cycle continues to be the subject of much current
interest [1-3]. Wetlands are generally accepted as being the largest, but least well
quantified, single source of methane (CH4), with emission estimates ranging from
105-278 Tg yr-1 [4]. Although the emissions of methane from the wetlands and lakes
of the boreal region are smaller than those from tropical wetlands, the size and
remoteness of the boreal region pose a significant challenge to the quantification of
both terrestrial ecosystem processes and their feedbacks to regional and global
climate.
Earth Observation (EO) data have become an important tool for characterizing the main
processes and estimating key variables governing the land-atmosphere interface. To that end,
the European Space Agency (ESA) initiated the Atmosphere-LANd Interactions Study
(ALANIS), in collaboration with the Integrated Land Ecosystem-Atmosphere Processes
Study (iLEAPS). One of the three ALANIS themes is investigating wetland dynamics and
methane emissions (denoted ALANIS methane, www.alanis-methane.info).
The ALANIS methane project has a focus on the boreal Eurasia region. There are two
main goals:
to produce a suite of relevant datasets derived from Earth Observation (EO):
a regional wetland extent dynamics product characterizing spatial changes
of inundated areas over time at low spatial resolution;
a local wetland extent dynamics product characterizing spatial changes of
lake and wetland surface over time at high/medium spatial resolution;
a snowmelt onset/duration/end product suitable for determining when
methane emissions from wetlands restart after the winter season;
a freeze onset product suitable for determining when lake/wetland methane
emissions stop after the summer season; and,
atmospheric column CH4 concentrations.
to use these (and other) EO products to evaluate and improve the Joint UK Land
Environment Simulator (JULES, http://www.jchmr.org/jules), a state-of-the-art land
surface model.
An overview will be given together with examples of how the ALANIS methane EO products
have been used to assess the performance of the JULES model in both its offline
configuration and as the land surface scheme in the HadGEM2-ES climate model with
atmospheric chemistry [7].
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