recall descending pass tp-7 in eclipse period
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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PART 1: A Brief Comparison of Time-Latitude First Stokes Bias Structure in
v505 and v620
Joe TenerelliSMOS 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 PeriodVariations in Tp7 strongest during this time of year:
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Corresponding v505 AF-FOV Bias in (Tx+Ty)/2Variations 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)/2Drift noticeably reduced in v620:
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Change from v505 to v620 BiasDrift difference between v620 and v504:
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Recall Descending Pass TP-7 in Eclipse PeriodBias 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-7Correlation 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)/2Ascending passes
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Corresponding v620 AF-FOV Bias in (Tx+Ty)/2Ascending passes
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Change from v505 to v620 BiasAscending 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)/2Descending-Ascending passes
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Corresponding v620 AF-FOV Bias in (Tx+Ty)/2Descending-Ascending passes
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Change from v505 to v620 BiasDescending-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)/2May 2011 descending passes
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Corresponding v620 AF-FOV Bias in (Tx+Ty)/2May 2011 descending passes
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Change from v505 to v620 BiasMay 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)/2May 2011 ascending passes
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Corresponding v620 AF-FOV Bias in (Tx+Ty)/2May 2011 ascending passes
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Change from v505 to v620 BiasMay 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).