Continuing and New Measurements at the Abyssal ALOHA Cabled - PowerPoint PPT Presentation

Continuing and New Measurements at the Abyssal ALOHA Cabled Observatory Bruce M Howe , James T Potemra, Rhett Butler, Fernando Santiago-Mandujano, Roger Lukas, Frederick K Duennebier, and David M Karl University of Hawaii at Manoa, Honolulu, Hawaii, USA and Jerome Aucan French Institute for Research and Development (IRD), New Caledonia Talk: OD11A-04 Ocean Sciences Meeting 2016 New Orleans, Louisiana, USA 22-26 February 2016

Outline – ALOHA Cabled Observatory (ACO) • Introduction and background • Science Highlights • Concluding remarks

ALOHA Cabled Station ALOHA Observatory (ACO): Hawaii Ocean ACO Timeseries Augment and (HOT) HOT 281 just finished support science with pH infrastructure at Station ALOHA R. Lukas, D. Karl F. Duennebier et and many others al., start 2002 WHOTS, C-MORE, SCOPE, …

ACO Evolution Node and first instruments Proof module hydrophone Cable Termination Feb 2007 June 2011 Jason USNS ZEUS 4728 m

ACO 2 Nov 2014 Camera-2 2 lights hydrophone Jason service Light-1 CT ADCP ADV Light Hydrophone Camera-1 Pressure 2 lights hydrophone 4728 m 8 ports BSP1: 1200 W CTDO2, ADCP 100 Mb/s Modem, Pressure, 1 us FLNTU

ACO Sept 2015 service UH ROV Lu‘ukai Add BSP2 Add LIGHT4 Recover: CAM2, BSP1, LIGHT1

ALOHA Cabled Observatory 20 Sept 2015 ROV Lu’ukai 4728 m Speed 2X Sea Cucumber genus Psychropodes a sail

ACO Camera-2 2 lights hydrophone Current state Light-1 Feb 2016 CT ADCP Service ADV Light Aug 2016 Hydrophone Camera-1 Pressure 2 lights hydrophone 4728 m BSP1: BSP2: CTDO2, ADCP CTDO2, Pressure Modem, Pressure, FLNTU FLNTU

Data and results ALOHA Cabled Observatory web site aco-ssds.soest.hawaii.edu

ACO Web Page • Data • MBARI SIAM and SSDS 😁 • Plots for last hour, … month • FTP for data • Documentation • Working with ACO • aco-ssds.soest.hawaii.edu

Temperature variability Bottom water 4700 m overflow ACO WHOTS Internal Kelvin Sensors agree 1 mK waves? 30 mK pp Spatial/temporal Since 2011 TODAY Lukas et al., PO12C-01, Rm 207, 10:30 AM Deppe et al., PO14C-2807, Poster, 4-6 PM Need sustained sampling

Pressure P absolute 1 m pp 7 days Remove TPXO tides 5 months P residual Ocean signals Tsunami Warning 20 cm pp …

Turbidity Correlated with bottom water speed Turbidity 5 months Turbidity 1 day running average Turbidity 10 cm/s 3 days Current 1 hour running average

HOT – near surface Fluorescence – chl a 0 m 25 year 200 m 5 months No events yet 3 days Objective: Detect particle export events from (very) episodic surface blooms (Karl and Letelier)

Abyssal biology • June 2011 while lights working • Lizard fish attacking Shrimp • About 1 second • Need for sustained continuous sampling • Continuous high power and high bandwidth communications Howe, Eos , 2014 • J. Drazen and A. Fleury

Acoustics – toward RAP paths Ship 3.5 kHz depth averaged IES sound speed C(r,z) path ACO ACO Modem modem ~ 30 km ~ inverted echosounder hydrophone Amp Predicted tide ~ 2 days δT ~2 ms range 0 60 km With Freitag and Singh Varamo, ONR

Sounds (in addition to whales, ships, rain…) Animal scraping frame? Thunder Higher frequencies – Animal’s body scraping frame? 15 s 12 s ~10 Hz – frame rocking resonance? 15 – 6000 Hz

Concluding remarks Infrastructure working from June 2011 Deepest power and internet on the planet, 4728 m • Suite of bottom instruments – Most donated – thanks! J – Need dual sensors, acoustic – However, challenges – cables, modem/inverted echosounder, connectors, sensors, …, ROV, calibrated hydrophone, O2, … … deep test bed • Science: – Bottom flow and mixing, – Pressure (sea level, circulation, tides, tsunami, …), – Deep biology, – Soundscapes, rain, wind, – Shallow-deep bio connections, thunder, … • Need direct access to upper ocean: profiler mooring • Need users – data and instruments – propose!

R/V Kilo Moana + ROV Lu‘ukai Science Party And the shore party! Sept 2015

aco-ssds.soest.hawaii.edu