Australian and Indian Biooptical
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1 Australian and Indian Biooptical profiling float activities in the Indian Ocean Nick Hardman-Mountford, Tom Trull, Jim Greenwood, Francois Dufois, Dirk Slawinski (CSIRO) Muthalagu Ravichandran, Satya Prakash, Uday Bhaskar (ESSO-INCOIS) Helen Phillips, Peter Strutton (U. Tasmania) CSIRO OCEANS & ATMOSPHERE FLAGSHIP
2 Indian Ocean biogeochemistry Stramma et al Dufois et al Brewin et al NASA: SeaWiFS
3 Australia-India Joint Indian Ocean Bio-Argo Project Characterising the changing Indian Ocean s biogeochemistry and ecology using revolutionary new robotic tools Collaboration between CSIRO (Australia), CSIR-NIO and ESSO-INCOIS (India) and IOC (UNESCO) REGION DATE AGENCY South Indian Ocean (STG) Jun - Jul 2015 CSIRO / NIO Bay of Bengal Jul 2015 INCOIS Western Indian Ocean Heard Island Java/Sumatra upwelling Dec 2015 Jan Mar 2016 INCOIS CSIRO 2015/16 TBD CSIRO / NIO Objectives: Coordinated bio-float deployments ( ) Joint protocol development for deployments and data (with international Bio-Argo community) Facilitate wider collaboration towards Indian Ocean Bio- Argo network
4 Sensors on floats For the next round of deployments, integrated optical sensors on Seabird Navis / Teledyne APEX include: Seabird SBE63 optode dissolved oxygen Wetlabs MCOMS (F chl, F cdom /b b (532), b b (700)) MBARI/Seabird ph Bolt-on optical sensors include: Wetlabs C-Rover 2000 transmissometer Wetlabs eco-bb3 (b 470, 532, 700 nm) Satlantic Deep SUNA (UV nitrate) Satlantic OCR 504 E d & L u (412, 443, 490, 555) or Ed only (380, 412, 443, PAR) Aanderaa optode dissolved oxygen
5 Quality Control considerations Pre-deployment standards : Parallel profiles Fl caps Lab intercalibration Quenching depth vs. MLD Comparability of sensors: MCOMS vs. Eco b b Non-zero dark counts Ocean colour match-ups
6 Deployment design: modelling float retention Mature eddies retain floats longer Greenwood, H-M, Dufois et al. (in prep).
7 Australia-India Joint Indian Ocean Bio-Argo Project Characterising the changing Indian Ocean s biogeochemistry and ecology using revolutionary new robotic tools Collaboration between CSIRO (Australia), CSIR-NIO and ESSO-INCOIS (India) and IOC (UNESCO) REGION DATE AGENCY South Indian Ocean (STG) Jun - Jul 2015 CSIRO / NIO Bay of Bengal Jul 2015 INCOIS Western Indian Ocean Heard Island Java/Sumatra upwelling Dec 2015 Jan Mar 2016 INCOIS CSIRO 2015/16 TBD CSIRO / NIO Objectives: Coordinated bio-float deployments ( ) Joint protocol development for deployments and data (with international Bio-Argo community) Facilitate wider collaboration towards Indian Ocean Bio- Argo network
8 Satellite Chla Autonomous profiling float observations of the high biomass plume downstream of the Kerguelen plateau in the Southern Ocean Melanie Grenier, Alice Della Penna, and Tom Trull Published in Biogeosciences, 2015
9 4 Bio-profilers (1 in 2011, 3 in 2014) Teledyne-Webb APF9I APEX floats Iridium telecomms Pumped CTD Specialized sensors T, S, O 2 470/695 nm chlorophyll fluorescence 700 nm particle backscatter Specialized mission swapping: shallow profiles from 300 m to surface 4-5 times per day single deep profile to 2000 m every 3 days Aanderaa O 2 Optode (CSIRO calibration, and drift evaluation) Wetlabs FLBB Fluorescence Backscatter Grenier, Della Penna, Trull (2015) BG
10 Good sampling of plume Grenier, Della Penna, Trull (2015) BG
11 Time from plateau controls biomass Grenier, Della Penna, Trull (2015) BG
12 Surface ( satellite ) vs. column (bioprofiler) Chl-a Grenier, Della Penna, Trull (2015) BG
13 Deployments in Eddies: Lagrangian floats? Anticyclonic (warm) Cyclonic (cold) Consistent sea surface height (SSH) contours plotted every 10 days to show that the float trajectory matches the movement of the eddy Pump, Phillips, Strutton, Trull (in prep.)
14 Seasonal adjustment of eddy phytoplankton Anticyclonic Note: bad backscatter data after 14 th Nov Cyclonic Note: no biological data after 26 th Nov More chlorophyll per cell in late October. More chlorophyll per cell from mid- October Pump, Phillips, Strutton, Trull (in prep.)
15 Satellite CHL data vs Float CHL data in top 20m Anticyclonic Cyclonic Pump, Phillips, Strutton, Trull (in prep.)
16 Questions?
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