Towards an hybrid antarctic float observation system hafos how to make floats ice compatible
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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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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

    • Ice sensing Algorithm (ISA)

    • Interim Storage (iStore)

    • RAFOS tracking

  • Future work


Weddell Sea data

AWI Floats

WOD01: CTD-Stations

1500 CTD stations

3800 float profiles


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


Floats within the sea ice


Ice compatibility of ARGO floats: a 3 step process


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


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


Surfacing in between ice

05.Oct. 2004

05. Oct.2004


Recent ARGO float distribution

http://argo.ocean.fsu.edu/images/big-so-map.pdf


Ice compatibility of ARGO floats: a 3 step process


Interim data Storage (iStore)


First iStore - Results


First iStore - Results


Ice compatibility of ARGO floats: a 3 step process


RAFOS subsurface tracking


Range of RAFOS-signals in the Weddell Sea


ARGO Float with RAFOSreceiver


Ice compatibility of ARGO floats: a 3 step process

 ISA/iSore/RAFOS – Float = fully ice compatible


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


Future work

Acoustic real-time data transmission is planned as final step

Hybrid Antarctic Float Observation System - HAFOS


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