Détection de la neige humide par télédétection micro-onde ...Radiométrie micro-onde Dry snow is...
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Détection de la neige humide par télédétection micro-onde passive
Ghislain Picard
Radiométrie micro-onde
Black body radiation
Microonde: 1mm - 10cm
Radiométrie micro-onde
Dry snow is a gray body and is partially transparent in the microwave.
T b=ϵT s
Satellite obs Emissivity Temperature
T(z,t)
SMMR, SSM/I, AMSR
Quasi-continuous time-series from 1979
Ɛ = 0.65 – 0.8
1-5m
Radiométrie micro-onde
Liquid water is a very strong absorber in the microwave domain black body→
T(z,t)Ɛ = 0.9 or moreTs = 273 K
1-5m
T b=T s
Satellite obs Emissivity Temperature
Principe physique
AMSR-E: 1 janvier 2006.
Algorithme
LGGE's algorithm by: Torinesi et al. 2003Picard et Fily, 2006, Picard et al. 2007
The daily dataset (1979-present) is available from: http://lgge.osug.fr/~picard/melting/
Modélisation
At 19 GHz very high sensitivity to LWC impossible to measure water quantity→ →
DMRT-ML simulation
Détection de la neige humide par télédétection micro-onde passive
Ghislain Picard
Radiométrie micro-onde
Black body radiation
Microonde: 1mm - 10cm
Radiométrie micro-onde
Dry snow is a gray body and is partially transparent in the microwave.
Tb=ϵT s
Satellite obs Emissivity Temperature
T(z,t)
SMMR, SSM/I, AMSR
Quasi-continuous time-series from 1979
Ɛ = 0.65 – 0.8
1-5m
Radiométrie micro-onde
Liquid water is a very strong absorber in the microwave domain black body→
T(z,t)Ɛ = 0.9 or moreTs = 273 K
1-5m
T b=T s
Satellite obs Emissivity Temperature
Principe physique
AMSR-E: 1 janvier 2006.
Algorithme
LGGE's algorithm by: Torinesi et al. 2003Picard et Fily, 2006, Picard et al. 2007
The daily dataset (1979-present) is available from: http://lgge.osug.fr/~picard/melting/
Modélisation
At 19 GHz very high sensitivity to LWC impossible to measure water quantity→ →
DMRT-ML simulation
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