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Level 2 Ocean Salinity Status

Level 2 Ocean Salinity Status. 6 October 2014. ARGANS & SMOS L2OS ESL. L2OS status. Processed all L1c v620 May & November 2011 (1700+ orbits) using tuned configuration (except not using L1 snapshot error flags) ESL & ARGANS analysis -> TN for FAT

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Level 2 Ocean Salinity Status

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  1. Level 2 Ocean Salinity Status 6 October 2014 ARGANS & SMOS L2OS ESL

  2. L2OS status • Processed all L1c v620 May & November 2011 (1700+ orbits) using tuned configuration (except not using L1 snapshot error flags) • ESL & ARGANS analysis -> TN for FAT • Processed all L1c v620 South Pacific 01/05/2011 to 31/04/2012 (291+ orbits) using tuned configuration (except not using L1 snapshot error flags) – results follow… • Processed all L1c v620 South Pacific 13/01/2010 to 28/02/2014 (4000+ orbits), extracting AUX_DTBXY for L1 tools long-term drift analysis (using ISAS climatology) – L1 drift presentation? • ADFs for reprocessing & pre-reprocessing rehearsal delivered 25/09/2014 • Tuned configuration gives higher quality salinity than 1st reprocessing, but fewer retrievals => quality rather than quantity • OTT for reprocessing (20100601) & rehearsal (20110501 & 20111101) • L2OS v622 & OSCOTT v622 delivery 08/10/2014, FAT 17/10/2014 (TBC) • minor bug fixes, no UDP/DAP science impact…

  3. L2OS v62x PRs since v620 delivery 05/09/2014 • L2OS • 0092: missing AUX_CNFOSD in delivery • 0093: AUX_DTBXY HDR wrong data in <File_Class> • 0094: different (identical) XML R/W API (04_02_01 or 02) – since 2009 • 0095: missing ADFCC description of AUX_CNFOSF changes • 0096: confusion of 2 x L1c products with same name but different data • Joel Wesson: Num_DSR wrong in AUX_RGHNS3 HDR – since 2011 • ESL(JLV)/0097: corrupted A3TEC fields in AUX_DTBXY_ • OSCOTT • 0002: writing AUX_DTBCUR when no valid DTBXY & input DTBCUR empty • Indra(Miguel)/0004: reports with same validity start/stop if no valid DTBXY_ • No impact on science products (ie UDP/DAP) since v620 • v622 ready for delivery now…

  4. Major L2OS changes from v550 to v62x • New forward model for galactic signal correction (Geometric Optics model) • Improved galactic noise flagging • Updated empirical roughness model 3 • Improved RFI detection & flagging • New OTT post-processor (OSCOTT) corrects drift daily • TEC retrieval from Stokes 3 for descending orbits (retrievals & OTT) • Refined galactic map LUTs • Improved measurement selection • Bug fixes in iterative scheme exit condition, computation of TB_42.5X/Y/H/V

  5. Expected reprocessing performance • Long term drift correction • ISAS comparisons – better RFI sorting, decreased N-S bias, better std (JB) • Improved quality in 9 day Level 3 maps (BEC) • L2OS metrics – better quality, less noise (MA) • Details in SO-TN-ARG-GS-0094_L2OS_v62x_ESL_Evaluation

  6. OSCOTT monitoring L1c long-term drift AFFOV Median snapshot error, June 2010 – February 2014 (model TB minus L1c TB in South Pacific 120-130W, 15-25S): minimal long-term drift, seasonal cycle remains. What about salinity?...

  7. OSCOTT impact on salinity – per orbit SSS1 delta = retrieved – prior South Pacific orbits, 120-130W, 15-25S, filtered by quality < 150 Operational: large oscillating bias due to monthly OTT delayed by ~24 days First reprocessing: smaller bias due to OTT every 2 weeks with no delay L2OS v550 DPGS OPER L2OS v550 REPR

  8. OSCOTT impact on salinity – per orbit Second reprocessing & DPGS operational chain: smaller bias due to daily OTT std(dSSS1_A) 0.21 psu std(dSSS1_D) 0.26 psu First reprocessing: smaller bias due to OTT every 2 weeks with no delay std(dSSS1_A) 0.23 psu std(dSSS1_D) 0.31 psu L2OS v620 L2OS v550 REPR

  9. OSCOTT impact on salinity – 9 day average Second reprocessing & DPGS operational chain: good bias tracking due to daily OTT First reprocessing: tracking slow drift May-August, but not later L2OS v620 L2OS v550 REPR

  10. OSCOTT impact on salinity – 9 day average Second reprocessing & DPGS operational chain: good bias tracking due to daily OTT OTT region: 0-30S, 120-150W L2OS v620 L2OS v620 OTT region

  11. What’s next… • Contract close-out • L2OS/OSCOTT delivery & FAT • Delivery of tools for L1 metrics (late!) • Pre-reprocessing rehearsal test: • first look at impact of updating AUX_DGGRFI • check tuned configuration (now filtering L1 snapshot errors) • Monitoring & analysis of reprocessing, update web-site • Develop follow-on contract work plan (RFQ proposal, & tomorrow @ QWG • Consolidate L2OS metrics

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