New model used existing formulation for foam coverage and foam emissivity; tested over 3 half orbits...
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New model used existing formulation for foam coverage and foam emissivity; tested over 3 half orbits in the Pacific
foam coverage exponent modified to 2.6 instead of 2.55 to better fit SMOS data obtained on 3 orbits (exponent still well inside uncertainties in existing measurements)
Two-Scale without foam
Two-Scale with foam
SMOS SSS
SMOS SSS ECMWF WS
Validation over 1 month (August) in Pac. Ocean reprocessed at LOCEAN (ascending orbits only)
Two-Scale with foamTwo-Scale without foam
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SSS comparisons
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-1
15
0
Wind Speed
Two-Scale without foam
SSS differences
Two-Scale with foam
Two-Scale without foamSSS profilesMonthly average
Two-Scale with foam
When the new model is implemented, anomaly associated with ice border appears notrh of 55N => we have to change our zone of validation in the Pac from 45S-55S to 45s-50S ! This is an example of compensated errors (bad wind correction compensated ice contamination!)
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4
SS
Sar
go-S
SS
smos
Wind speed (m/s)0 5 10 15 20 25
Colocations with ARGO (New model 1)
Colocations with ARGO Center of track (<300km)
New model Old model
0 5 10 15 20 25 0 5 10 15 20 25 Wind speed (m/s) Wind speed (m/s)
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SSSsmos-SSSargo
South Pacific: N=9505all=0.12+/-1.26
ITCZ : N=15674all=-0.31+/-0.67
South Pacific: N=9615all=0.15+/-1.29
ITCZ : N=16291all=-0.16+/-0.67
(IFREMER/CLS empirical)
New empirical model 2
New semi-theoretical model 1
In term of 1st stokes parameter, model 1 and model 2 are now close… but their dependence in incidence angle is different; need to introduce other dependencies in the processor for model 1 (air-sea temperature instability influence on foam coverage is now neglected but need to be tested…)
Colocations with ARGO Whole track
New model Old model
0 5 10 15 20 25 0 5 10 15 20 25 Wind speed (m/s) Wind speed (m/s)
-4
4
SSSsmos-SSSargo
South Pacific: N=19032all=0.02+/-1.70
ITCZ : N=26313all=-0.23+/-0.87
South Pacific: N=17493all=0.31+/-1.60
ITCZ : N=31970all=-0.05+/-1.03