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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

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

slide2
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

slide7
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 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
slide21
Future work

Acoustic real-time data transmission is planned as final step

Hybrid Antarctic Float Observation System - HAFOS

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