School of Ocean and Earth Science and TechnologyUniversity of Hawai’i at Manoa

11 February 2013

ALOHA Cabled Observatory:Data Considerations

R. Lukas, D. Karl and many others

ALOHA Cabled Observatory (ACO)Node installed June 2011 – deepest at 4728 m

Station ALOHA

ACO

F. Duennebier et al. started 2002

ACO bottom configuration

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Data and results

Aloha.manoa.hawaii.edu

CameraOBS light failed 3 JulyCAM lights failed 18 July

Jason on left – last moments on bottom “shrimp” swimming by

Deep-sea lizard fish attempting to eat an aristeid shrimp

Jeff Drazen and Aharon Fleury, UHawaii

One day, one minute of sound

First blues 31 October 2012

x10

Humpbacks returning 25 Nov 2012

ACO Network

Seafloor 100 Mb/s

Makaha 1 Gb/s

Makaha – Manoa HT 3 Mb/s MPLS

SOEST network 1 Gb/s

Internet 2 10 Gb/sReal-time data

display and access50 in-water IPs55 dry IPs

http://aloha.manoa.hawaii.edu

Future 1 Gb/s

ACO Data Management

NB ! MBARI SSDS and SIAM

Data numbers• Two hydrophones, each sampled (16 bit) 96,000 Hz, total

3 Mb/s, 12 TB/y• Other – temperature, velocity, etc – small• When video starts working again this September, H.264 <

1 Mb/s• Using NAS drives now• Starting to use Blu-ray• Buffering needed at shore station• 3 Mb/s link to UH Manoa now ($)• In process: 1 Gb/s link over state/UH network (< $)

• Network complexity – IP addresses– Subsea 55– Shore 50

Data Management

• SIAM (Software infrastructure and application for MOOS) – instrument servers, from MBARI (Monterey Bay Aquarium Research Institute)

• SSDS – Shore-side Data System – MBARI• Custom – hydrophone, pressure, …

• Practical problems – what are best practices for acoustic and video data?

Lessons• Don’t underestimate shore-side needs

– Network management – intensive!– Data management – intensive!– Documentation – intensive!– Real-time – intensive!

• Include good time stamps – cross-correlating data (and problems)

• Understanding problems with data – intensive!• Observatories – sustained long-term

observations – prove value with un-aliased data