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NOAA SSS Science Team FY12 Q3 Meeting 30 May 2012

Aquarius Update Gary Lagerloef , Aquarius Principal Investigator * And Aquarius Science/Cal/Val Team. NOAA SSS Science Team FY12 Q3 Meeting 30 May 2012. Where We Are Today. Seven Month Mean Global Map. 25 May completed 9 months of data collection. Aquarius data record start:

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NOAA SSS Science Team FY12 Q3 Meeting 30 May 2012

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  1. Aquarius Update Gary Lagerloef, Aquarius Principal Investigator *And Aquarius Science/Cal/Val Team NOAA SSS Science Team FY12 Q3 Meeting 30 May 2012

  2. Where We Are Today Seven Month Mean Global Map 25 May completed 9months of data collection Aquarius data record start: 25 August 2011 Data Processing Version 1.2.3 -> Version 1.3 “Deflection Ratio” Gain Drift Correction Combined Scatterometer+NCEP Wind Correction

  3. Data Access http://aquarius.nasa.gov/

  4. Operational Data Processing

  5. a 28 August - 28 December 2011 Submitted EOS Special Report 8feb2012 Tropical Instability Waves Paper by Lee, et al, Subitted GRL b 3–9 October 2011

  6. Tropical Instability Waves T.Lee et al, GRL, Submitted May 2012

  7. Comparison to Argo Buoys Aquarius salinity at buoy location & time Buoy salinity 10/1/2011 through 2/29/2012

  8. Aquarius – Argo Difference 10/1/2011 through 2/29/2012

  9. Aquarius – Argo Histograms V1.2.310/1/2011-2/29/2012 SST > 5Cland and ice frac <0.0005

  10. Aquarius – Argo Trends The initial radiometer calibration, V1.1, was obtained in the two weeks after power on. This was eventually found to have a long term quasi-asymptotic drift in all the radiometer channels. An interim V1.2.x set of corrections were tested Oct2011 – Mar2012. An internal calibration V1.3 was was put in the processing system early Apr 2012. V1.1 and V1.2.x are discontinued Replaced by V1.3 V1.1 bias V1.3 bias SST > 5C V1.3 still has residual quasi-monthly SSS-Argo bias variations of ±0.2 psu. These are related to the residual radiometer calibration bias variations ±0,1K after the long-term calibration trend was removed with the internal calibration algorithm. The source is still being investigated.

  11. Quasi-Monthly Bias Variations V1.2.3 bias SST > 5C Residual quasi-monthly SSS-Argo bias variations of +/- 0.2 psu are the related to the residual radiometer calibration bias variations after the long-term calibration trend was removed with the deflection ratio model Beam 1 Beam 3 Beam 2

  12. Cross-over Difference Maps One week cross over differences map of all three beams; 9/1/2011-9/7/2011 ascending SSS descending SSS ascending – descending SSS

  13. Ascending vs Descending Orbits Ascending orbit bias has slight positive trend; Descending bias consistently > 0 and slight negative trend Time series of the daily median bias Time series of Crossover Differences Recent analyses indicate that the ascending-descending trend is related to the ionosphere Faraday rotation correction. Argo buoy differences -0.1 mean Some effect is also likely to be caused by 6am – 6pm SST bias in the SSS retrieval V1.310/1/2011-2/29/2012; land and ice frac <0.0005

  14. Daily Argo Matchups Daily scatter plots and histograms at http://aquarius.esr.org 20 May 2012

  15. Argo SSS Sep-Dec 2011 To appear in Lagerloef et al, SOC 2011, BAMS July 2012; Argo analysis by Johnson and Lyman

  16. AquariusSSS Sep-Dec 2011 To appear in Lagerloef et al, SOC 2011, BAMS July 2012

  17. Aquarius - Argo To appear in Lagerloef et al, SOC 2011, BAMS July 2012

  18. Sep-Oct-Nov 2011 S(E-P)/H Aquarius Argo

  19. Dec-Jan-Feb 2012 S(E-P)/H Aquarius Argo

  20. Summary – The Work Ahead • First order calibration issues are solved • Pesky small calibration drifts and retrieval errors are still being investigated • Don’t trust data south of 40 S (yet) • Aquarius is providing new detailed data on the tropical SSS variability and spatial structure, and its coupling to tropical rainfall patterns • Seasonal progression in the tropics is clearly evident in the data. • A 0.5o pointing offset requires algorithm overhaul • Re-computation of many tables: Galaxy, coastal, roughness, etc… • Next algorithm version is being updated and tested over the summer • Validated data to be released in December 2012 (Version 2.0) • Cal/Val/Algorithm workshop being planned for the last week of October at GSFC (Maryland) • Special JGR-Ocean section: Early scientific results from the salinity measuring satellites Aquarius/SAC-D and SMOS. Submissions open Feb 2013 – May 2013

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