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Towards an Hybrid Antarctic Float Observation System (HAFOS) how to make floats ice compatible

Towards an Hybrid Antarctic Float Observation System (HAFOS) how to make floats ice compatible. O. Klatt , O. Boebel, E. Fahrbach Alfred-Wegener-Institut für Polar- und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany. Outline. Motivation Ice compatible floats

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Towards an Hybrid Antarctic Float Observation System (HAFOS) how to make floats ice compatible

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  1. Towards an Hybrid Antarctic Float Observation System (HAFOS)how to make floats ice compatible O. Klatt , O. Boebel, E. Fahrbach Alfred-Wegener-Institut für Polar- und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany

  2. Outline • Motivation • Ice compatible floats • Ice sensing Algorithm (ISA) • Interim Storage (iStore) • RAFOS tracking • Future work

  3. Weddell Sea data AWI Floats WOD01: CTD-Stations 1500 CTD stations 3800 float profiles

  4. ARGO float distribution in 2004 AWI floats in the eastern Weddell Gyre with ice-sensing algorithm (ISA), successful for 2 seasons Western Weddell Sea, void of profiles http://argo.ocean.fsu.edu/images/big-so-dis-map.jpg

  5. Floats within the sea ice

  6. Ice compatibility of ARGO floats: a 3 step process

  7. Ice Sensing Algorithm T = -1.79 °C braces missing profiles Median (T|p=(50,45,40,35,30,25,20 dbar)  -1.79 °C): -> abort surface attempt

  8. Concentration [%] Floats vs. ice coverage 2005 ISA-Floats 2004 2003 2002 Non-ISA-Floats 2001 2000 1999 1st year 2nd year 3rd year 4th year 5th year

  9. Surfacing in between ice 05.Oct. 2004 05. Oct.2004

  10. Recent ARGO float distribution http://argo.ocean.fsu.edu/images/big-so-map.pdf

  11. Ice compatibility of ARGO floats: a 3 step process

  12. Interim data Storage (iStore)

  13. First iStore - Results

  14. First iStore - Results

  15. Ice compatibility of ARGO floats: a 3 step process

  16. RAFOS subsurface tracking

  17. Range of RAFOS-signals in the Weddell Sea

  18. ARGO Float with RAFOSreceiver

  19. Ice compatibility of ARGO floats: a 3 step process  ISA/iSore/RAFOS – Float = fully ice compatible

  20. Conclusion • The development of ice compatible ARGO floats is (almost) completed • ISA is ~80% successful • iStore delivered first profiles • RAFOS works fine for distances < 600 km • The first fully ice compatible floats will be deployed during next season

  21. Future work Acoustic real-time data transmission is planned as final step Hybrid Antarctic Float Observation System - HAFOS

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