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

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


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

Outline

  • Motivation

  • Ice compatible floats

    • Ice sensing Algorithm (ISA)

    • Interim Storage (iStore)

    • RAFOS tracking

  • Future work


Weddell sea data

Weddell Sea data

AWI Floats

WOD01: CTD-Stations

1500 CTD stations

3800 float profiles


Argo float distribution in 2004

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


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

Floats within the sea ice


Ice compatibility of argo floats a 3 step process

Ice compatibility of ARGO floats: a 3 step process


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

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


Floats vs ice coverage

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

Surfacing in between ice

05.Oct. 2004

05. Oct.2004


Recent argo float distribution

Recent ARGO float distribution

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


Ice compatibility of argo floats a 3 step process1

Ice compatibility of ARGO floats: a 3 step process


Interim data storage istore

Interim data Storage (iStore)


First istore results

First iStore - Results


First istore results1

First iStore - Results


Ice compatibility of argo floats a 3 step process2

Ice compatibility of ARGO floats: a 3 step process


Rafos subsurface tracking

RAFOS subsurface tracking


Range of rafos signals in the weddell sea

Range of RAFOS-signals in the Weddell Sea


Argo float with rafos receiver

ARGO Float with RAFOSreceiver


Ice compatibility of argo floats a 3 step process3

Ice compatibility of ARGO floats: a 3 step process

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


Conclusion

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


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

Future work

Acoustic real-time data transmission is planned as final step

Hybrid Antarctic Float Observation System - HAFOS


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