Kalantari, Parvin; Bernier, Monique; McDonald, Kyle; Poulin, Jimmy
(2014).
Using available time series of passive and active microwave to develop smap freeze/thaw algorithms adapted for the Canadian Subarctic.
In: IEEE International Geoscience and Remote Sensing Symposium - GARSS 2014, 13-18 juillet 2014, Québec, Canada.
Résumé
Seasonal terrestrial Freeze/Thaw cycle in Northern Quebec
Tundra (Nunavik) determined and evaluated with Passive
and Active Microwave Observations. SMOS time series
data were analyzed to examine seasonal variations of soil
freezing, and to assess the impact of snow cover and land
cover on freeze-thaw cycle. Further, the soil freezing maps
derived from SMOS observations compared to microwave
active images in the region near Umiujaq and Field survey
data. The objective is to develop algorithms to follow the
seasonal cycle of freezing and thawing of the soil in the
Tundra and Boreal forest. Field data shows that freezing and
thawing dates vary much spatially at the local scale in the
Boreal Forest and the Tundra. Therefore, the field validation
of the F/T state maps at the regional scale will be very
important. Agreement Factor derived from comparison of
SMOS FT maps with daily in-situ data shows low values
which does not seems to be acceptable. New parameters
such as lake and pond as well as vegetation type and height
present on surface have to be introduced in the algorithm to
obtain more realistic estimations.
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