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

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

Continuing and New Measurements at the Abyssal ALOHA Cabled Observatory

Outline – ALOHA Cabled Observatory (ACO)

• Introduction and background
• Science Highlights
• Concluding remarks

• R. Lukas, D. Karl

and many others

Station ALOHA

ACO

HOT 281 just finished pH

ALOHA Cabled Observatory (ACO): Augment and support science with infrastructure at Station ALOHA

• F. Duennebier et

al., start 2002

Hawaii Ocean Timeseries (HOT)

WHOTS, C-MORE, SCOPE, …

Feb 2007

Cable Termination Proof module hydrophone

USNS ZEUS

ACO Evolution

Node and first instruments

Jason

June 2011

4728 m

Hydrophone Pressure BSP1: CTDO2, ADCP Modem, Pressure, FLNTU

2 Nov 2014

ACO

4728 m

8 ports 1200 W 100 Mb/s 1 us CT ADCP ADV Light Camera-1 2 lights hydrophone Light-1 Camera-2 2 lights hydrophone

Jason service

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

Hydrophone Pressure BSP1: CTDO2, ADCP Modem, Pressure, FLNTU

ACO

4728 m

CT ADCP ADV Light Camera-1 2 lights hydrophone Light-1 Camera-2 2 lights hydrophone

Current state Feb 2016 Service Aug 2016

BSP2: CTDO2, Pressure 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

TODAY Lukas et al., PO12C-01, Rm 207, 10:30 AM Deppe et al., PO14C-2807, Poster, 4-6 PM

Bottom water

• verflow

Internal Kelvin waves?

Sensors agree 1 mK Spatial/temporal Since 2011 WHOTS ACO 30 mK pp

Need sustained sampling

4700 m

Ocean signals Tsunami Warning …

Pressure

P absolute 5 months 7 days Remove TPXO tides 20 cm pp 1 m pp P residual

1 hour running average 1 day running average

Turbidity

Correlated with bottom water speed

Turbidity 5 months Turbidity 3 days Current Turbidity 10 cm/s

Objective: Detect particle export events from (very) episodic surface blooms (Karl and Letelier)

Fluorescence – chl a

No events yet

25 year 0 m 200 m 5 months 3 days

HOT – near surface

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

• J. Drazen and A. Fleury

Howe, Eos, 2014

Acoustics – toward depth averaged sound speed

Ship 3.5 kHz ACO modem hydrophone

C(r,z)

Predicted tide

δT ~2 ms

~ 2 days

~ 30 km

ACO Modem ~ inverted echosounder

With Freitag and Singh Varamo, ONR

Amp range

IES path RAP paths

60 km

Sounds (in addition to whales, ships, rain…)

15 s

Animal scraping frame?

~10 Hz – frame rocking resonance? Higher frequencies – Animal’s body scraping frame?

Thunder

12 s 15 – 6000 Hz

Concluding remarks

Infrastructure working from June 2011 Deepest power and internet on the planet, 4728 m

• Need direct access to upper ocean: profiler mooring
• Need users – data and instruments – propose!
• Science:
• Suite of bottom instruments – Most donated – thanks! J

– Need dual sensors, acoustic modem/inverted echosounder, calibrated hydrophone, O2, … – However, challenges – cables, connectors, sensors, …, ROV, … deep test bed – Bottom flow and mixing, – Deep biology, – Shallow-deep bio connections, – Pressure (sea level, circulation, tides, tsunami, …), – Soundscapes, rain, wind, thunder, …

R/V Kilo Moana + ROV Lu‘ukai Science Party

And the shore party!

Sept 2015

aco-ssds.soest.hawaii.edu