Towards Optics-Based Measurements in Ocean Observatories - The Argo program E. Boss (H. Claustre, K. Johnson) What is Argo? Optical measurements on profiling.

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Presentation transcript:

Towards Optics-Based Measurements in Ocean Observatories - The Argo program E. Boss (H. Claustre, K. Johnson) What is Argo? Optical measurements on profiling floats. Integration of optical sensing into Argo.

The Argo array On average, a profile from 2000m every 10days

The Argo Observing System Made entirely of profiling floats (relatively homogeneous technology). Global in scope and in participation Climate focus (GODAE, CLIVAR, GOOS) Real-time and delayed mode QC Nearly 1,000,000 profiles to date!

Automated data flow:

Human-In-The-Loop Delayed-mode data flow: Yearly ADMT meeting to keep improving this system

The Argo Observing System Relatively cheap (~$100 per profile) Sustained (measurements where and when we cannot be there). Limited in power, real-estate and bandwidth (improving all the time). Little control where platform drifts to (improving via modeling/assimilation).

Optics on profiling floats Greg Mitchell – radiometer observing the spring bloom in the Sea of Japan Bishop – Observation of dust iron fertilization and artificial iron fertilization. Carbon explorer. PIC-sensor. Claustre – using transmissometry to compute growth rate using 3 day-time profiles Boss – 3yrs of sustained observations. Challenging the Sverdrup model of the spring bloom in the NA. Boss – Testing the use of profiling floats as vicarious calibration platform

3 years of data Eddy event

A vision for the future: the Riley (or NPZ) float N: ISUS P: F_chl, bb or beam-c Z: LOPC/Gorsky/novel cheap acoustic b b +PAR & O 2 Minimum sensor-suite to constrain ecosystem models. Our vision is often constrained to be ‘bottom-up’ by the lack of cheap zooplankton sensors.

Optics (and BGC) on Argo

Oceanography (2009) « Bio-Argo » Community White Paper « Bio-platform in open Ocean » Plenary Paper Toward the Implementation of a Global Autonomous Biogeochemical Observing System. WHOI, July 19, 2011 Link with Euro-Argo highly welcomed The Bio-Argo community is getting organized:

Bio-optics on Argo – where are we today: Invited to ADMT-12 to build the Real-time QC framework for F_chl, bb and Nitrate. Euro-Argo: 20% of floats with BGC sensors. US: regional projects in planning stage. Some limiting factors: 1.Cost of sensors. 2.Sensitivity of sensors. 3.Trained personnel at DACs