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| Titel |
Surface status information from scatterometer data for improved climate modelling at high latitudes |
| VerfasserIn |
Christoph Paulik, Vahid Naeimi, Annett Bartsch, Stefan Schlaffer, Wolfgang Wagner, Kirsten Elger, Birgit Heim |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052044
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| Zusammenfassung |
| Boreal soils with underlying permafrost are expected to increasingly contribute
to global greenhouse gas emissions under warmer climatic conditions. The
ESA STSE funded project ALANIS-Methane (www.alanis-methane.info)
aims to assess the potential of a combined land surface modelling and earth
observation approach to quantify methane emissions in Northern Eurasia.
Necessary model inputs/constraints like freeze-thaw and wetlands dynamics
are derived from a variety of sensors. The objective the ESA DUE project
Permafrost (www.ipf.tuwien.ac.at/permafrost) is to establish a monitoring
system based on satellite data. Remotely sensed products are especially
adapted and/or developed for use by climate modelers who address
permafrost issues.
The purpose of this study which contributes to ALANIS-Methane as well as
DUE Permafrost is to demonstrate the potential of C-Band scatterometer data
(ASCAT onboard MetOp A) for the detection of Freeze/Thaw conditions on a
global scale. An empirical threshold-analysis algorithm is used to produce a
product which differentiates between frozen, unfrozen and melting conditions.
The Freeze/Thaw product has been validated with different global and
regional temperature datasets ranging from model data (ERA-INTERIM,
GLDAS-NOAH) to in-situ measurements (WMO-METEO stations, CALM
Borehole data) for the years 2007 and 2008. This validation shows good
agreement between the extracted frozen/unfrozen flag and the various
temperature datasets. |
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