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SOLO2/S2A Status

Updates on SOLO2 and S2A Argo floats, hardware enhancements, energy budget, MRV production, improvements, and collaborations. Detailed findings and conclusions included. Visit the provided link for engineering plots.

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SOLO2/S2A Status

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  1. SOLO2/S2A Status Breck Owens AST-14 Wellington March 18-21

  2. SOLO2 versus S2A • SOLO2 (SIO IDG) and S2A (MRV) differ only in their designation at AIC. • Software improvements and enhancements are shared between IDG and MRV. WHOI also involved in development and diagnosing problems. • Hardware improvements are shared as well. • Decoding software and uplink web-page available to Argo Community.

  3. Performance SOLO-II • High failure rate for first 15 deployed April 2011 due to bladder tears. • 91 of next 93 (SIO Argo + NZ Argo + OKMC) are still active • 18 additional OKMC SOLO-II floats being deployed this month. S-2A • 72 S-2A floats have been deployed by SIO Argo, WHOI Argo and Australian Argo • The first batch, 20 SIO Argo instruments, deployed in Sept 2011 has 4 failed out of 20. • SIO 50/52 deployed since then are active. • WHOI 46/48 are active.

  4. Energy Budget 9.5 KJ per cycle For 2 battery packs, de-rated by 33%, capacity = 2016 KJ, approximately 200 cycles, or 5.5 years For 3 battery packs, capacity = 3024 KJ or over 300 profiles or 8.2 years Engineering plots at: http://argo.whoi.edu/solo2/ Note CTD on continuously 2000 dbar to the surface, 32% of energy budget, rise rate = 11 cm/sec

  5. MRV Production Facility Note new antenna, Carbon shaft, with encapsulated antenna.

  6. New GPS/Iridium Antenna 1. Low cost 2. Easy to Manufacture - Consistent and reproducible - low production reject rate 3. low water absorption, long-term stability 4. High durability 5. smaller volume/less weight 6. ease of changing form factor 7. 6000 dbar version for deep Argo 8. ability to integrate Bluetooth

  7. Descent/Ascent Information Have all timing and pressure information needed to define subsurface information for Traj3.0 format. Note repeatable descent and ascent behavior Ascent spent = 11 cm/sec

  8. Improvements • Simplified internal design removed 800 gm. • Will add 3rd battery pack. This should allow for over 300 profiles. • New low SWR Iridium/GPS antenna. Improved performance, better manufacturing procedures, increased reliability and durability • Identified possible reset due to reflected RF energy from antenna.

  9. Controller Replacement • New controller nearing completion • based on ARM, low power CPU • reworking software for improved portability- improved board layout, in production- enhanced onboard memory to store profiles, for example for under-ice deployments • More ports for easily adding other sensors

  10. Conclusions • SOLO-2 and S2A floats are the same • Collaboration between SIO, MRV, and WHOI will maintain the same hardware and software. • MRV and JFE Advantech Co.  (JAC) have signed distribution agreement. S2A floats are now available for Asian Argo partners. • SOLO-2 and S2A floats are working well.

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