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PART 1: A Brief Comparison of Time- Latitude First Stokes Bias Structure in v505 and v620 PART 1: A Brief Comparison of Time- Latitude First Stokes Bias Structure in v505 and v620 Joe Tenerelli SMOS Calibration Meeting 18 26/05/2014

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PURPOSE: Compare v504 and v620 alias-free average bias structure as a function of time and latitude, focusing on May 2011 (not eclipse period with relatively small orbital drift in v504) and Nov 2012-Jan 2013 (eclipse period).

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Recall Descending Pass TP-7 in Eclipse Period Variations in Tp7 strongest during this time of year:

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Corresponding v505 AF-FOV Bias in (Tx+Ty)/2 Variations in first Stokes parameter also strongest during this time of year in version 504 of reconstructed Tbs:

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Corresponding v620 AF-FOV Bias in (Tx+Ty)/2 Drift noticeably reduced in v620:

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Change from v505 to v620 Bias Drift difference between v620 and v504:

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Recall Descending Pass TP-7 in Eclipse Period Bias change pattern seems to correspond well to the Tp-7 pattern in descending passes. So is the change in the bias linked to the removal of the one-slope model?

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Descending Pass Bias vs TP-7 Correlation between Tp7 and bias in first Stokes is reduced in V620 rtelative to that in v504:

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We next look at ascending pass bias

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v505 AF-FOV Bias in (Tx+Ty)/2 Ascending passes

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Corresponding v620 AF-FOV Bias in (Tx+Ty)/2 Ascending passes

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Change from v505 to v620 Bias Ascending passes

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CONCLUSION FOR ASCENDING PASSES: Latitudinal variation also seems reduced for ascending passes in the eclipse period.

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We next look at descending-ascending pass bias

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v505 AF-FOV Bias in (Tx+Ty)/2 Descending-Ascending passes

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Corresponding v620 AF-FOV Bias in (Tx+Ty)/2 Descending-Ascending passes

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Change from v505 to v620 Bias Descending-Ascending passes

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We next look at May 2011 where the change is mostly an overall shift in the level of the brightness temperature with little latitude- time structure.

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Corresponding v505 AF-FOV Bias in (Tx+Ty)/2 May 2011 descending passes

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Corresponding v620 AF-FOV Bias in (Tx+Ty)/2 May 2011 descending passes

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Change from v505 to v620 Bias May 2011 descending passes

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We next look at ascending pass bias for May 2011

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Corresponding v505 AF-FOV Bias in (Tx+Ty)/2 May 2011 ascending passes

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Corresponding v620 AF-FOV Bias in (Tx+Ty)/2 May 2011 ascending passes

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Change from v505 to v620 Bias May 2011 ascending passes

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CONCLUSION FOR MAY 2011 ASC/DESC PASSES: Noticeable decrease in long-term drift in v620 relative to v504 for ascending passes. Little short term drift in either version in this period.

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Fourth Stokes Bias

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Fourth Stokes v505 Bias

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Fourth Stokes v620 Bias

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Fourth Stokes v620-v505 Bias

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CONCLUSION FOR FOURTH STOKES: Reduced short term drift. Less obvious correlation with Faraday rotation (should be none).

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