ArgoOxygen Program Overview - PowerPoint PPT Presentation
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ArgoOxygen Program Overview
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O2 is rather sensitive to changes in circulation and biology ... Adding O2 reduces battery life by 10-30% (can be compensated by more efficient Seabird CTD pump) ... – PowerPoint PPT presentation
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Title: ArgoOxygen Program Overview
1
Argo-Oxygen Program Overview
- White paper produced by writing team lead by
Nicolas Gruber - Scientific justification for measuring
sub-seasonal to decadal O2 changes - O2 is rather sensitive to changes in circulation
and biology - Subsurface O2 changes are an indication of
oceanic export production - Important to understand ocean O2 outgassing for
interpretation of the atmospheric O2 record - New sensor technology means drift and accuracy
can be within the required limits
2
Argo-Oxygen Program update
- White paper presented to the AST-8 in March
- Well received AST supported Dr Grubers propsal
for a coordinated pilot study - AST concerned over the effect on battery life,
float failure rates, cost, and implications for
current legal agreements - For the pilot study, it was agreed that SIC would
oversee the project for the next phase and that
Dr Gruber will continue to lead the Argo-Oxygen
team.
3
Technical issues
- Choice of floats (ARGOS vs Iridium)
- CTD pumps, data upload rates
- Sensors types (IDO vs Optode)
- Accuracy, drift
- Adding O2 reduces battery life by 10-30 (can be
compensated by more efficient Seabird CTD pump) - Increased cost (inc. sensors, data transfer) is
20-30, and around 40 when reduced float
lifetime is taken into account
4
Implementation Phase
- Deploy around 100 floats in a concentrated area
of scientific interest (i.e. Nth Atlantic, Nth
Pacific) - Cost for 2 years of floats 2.5M ship time
regular Winkler titrations from ships to validate
float obs - Integrate pilot study with i.e. biogechemical
modelling studies to estimate export production
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