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UPDATE ON SMOS LONG-TERM BIASES OVER THE OCEAN AND ROUGH SURFACE SCATTERING OF CELESTIAL SKY NOISE. Joe Tenerelli SMOS L2OS Progress Meeting Arles, France, September 26, 2011. SMOS PASSES USED IN THIS ANALYSIS. DRIFT IN 2010 ONLY. NO LOSS MODEL. ONE-SLOPE LOSS MODEL.

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Joe tenerelli smos l2os progress meeting arles france september 26 2011

UPDATE ON SMOS LONG-TERM BIASES OVER THE OCEAN AND ROUGH SURFACE SCATTERING OF CELESTIAL SKY NOISE

Joe Tenerelli

SMOS L2OS Progress Meeting

Arles, France, September 26, 2011









Joe tenerelli smos l2os progress meeting arles france september 26 2011

ONE-SLOPE LOSS MODEL

Notice the significantdesc-ascbiasnowappearingwithboth one and twoslopelossmodelsbetweenNov 2010 and April 2011. It is of opposite sign to thatbetween Sep and Dec 2010 observedwith no loss model. It appearsthat the loss correction istoostrong in thisperiod.


Joe tenerelli smos l2os progress meeting arles france september 26 2011

TWO-SLOPE LOSS MODEL

The two-slope model seems to degradedesc-ascbias relative to the one-slope model.


Joe tenerelli smos l2os progress meeting arles france september 26 2011

ONE-SLOPE LOSS MODEL: IMPACT OF GALACTIC REFLECTION MODEL

It turns out that, for the metricsusedhere, the impact of the formulation of galactic noise scatteringat the surface on desc-ascbiasisquitesmalleven for descending passes in September.

Kirchhoff scatteringmodel for galactic noise


Joe tenerelli smos l2os progress meeting arles france september 26 2011

ONE-SLOPE LOSS MODEL: IMPACT OF GALACTIC REFLECTION MODEL

It turns out that, for the metricsusedhere, the impact of the formulation of galactic noise scatteringat the surface on desc-ascbiasisquitesmalleven for descending passes in September.

Flat surface reflection model for galactic noise





Joe tenerelli smos l2os progress meeting arles france september 26 2011

LONG TERM DRIFT JUNE 2010 – JUNE 2011

Considering the June 2010 to June 2011 period, thereisverylittle net drift in the AF and EAF FoVs

In the ascending passes.


Joe tenerelli smos l2os progress meeting arles france september 26 2011

SHORT TERM DRIFT IN 2010 AND 2011

The two-slope model seems to degradedesc-ascbias relative to the one-slope model.

Two-slopedegradesdesc-ascconsistency



Joe tenerelli smos l2os progress meeting arles france september 26 2011

The following are biascurves for operational DPGS Level 1B data:


Joe tenerelli smos l2os progress meeting arles france september 26 2011

The following are biascurves for operational DPGS Level 1A data and using JRECON with no direct sun correction:


Joe tenerelli smos l2os progress meeting arles france september 26 2011

Comparing Original DPGS with L1PP
























Joe tenerelli smos l2os progress meeting arles france september 26 2011

CROSS SECTIONS THROUGH THE CELESTIAL SKY MAPS

NEW SEMI-EMPIRICAL MODEL: Ascending Passes


Joe tenerelli smos l2os progress meeting arles france september 26 2011

CROSS SECTIONS THROUGH THE CELESTIAL SKY MAPS

NEW SEMI-EMPIRICAL MODEL: Descending passes











Joe tenerelli smos l2os progress meeting arles france september 26 2011

IMPACT OF GALACTIC NOISE MODEL ON BIAS TREND ANALYSIS

The curves show the contribution of scatteredcelestialsky noise to FoVbiases, basedupon the Kirchhoff model evaluatedat a 3 m/s wind speed.


Joe tenerelli smos l2os progress meeting arles france september 26 2011

IMPACT OF GALACTIC NOISE MODEL ON BIAS TREND ANALYSIS

Similar to previousslide but for the flat surface reflectedcelestialsky noise.


Joe tenerelli smos l2os progress meeting arles france september 26 2011

IMPACT OF GALACTIC NOISE MODEL ON BIAS TREND ANALYSIS

The biascurvesbelowwerecomputedusing the original Kirchhoff model evaluatedat a 3 m/s wind speed.


Joe tenerelli smos l2os progress meeting arles france september 26 2011

IMPACT OF GALACTIC NOISE MODEL ON BIAS TREND ANALYSIS

With the new empiricalgeometricoptics model the curves change verylittle.


Joe tenerelli smos l2os progress meeting arles france september 26 2011

IMPACT OF GALACTIC NOISE MODEL ON BIAS TREND ANALYSIS

Evenswitching to flat surface reflectedgalactic noise makeslittledifference:


Joe tenerelli smos l2os progress meeting arles france september 26 2011

IMPACT OF GALACTIC NOISE MODEL ON BIAS TREND ANALYSIS

For thesecurveswe have used the original theoreticalroughnessemission model. This alsomakeslittledifference.