km3net wp5 vertical profiles of bioluminescence

KM3Net WP5Vertical profiles of bioluminescence

Monty Priede & Alan JamiesonOceanlab

i.g.priede@abdn.ac.uk

The Lander Operating Principle

Descent at <1m.s-1

Data collection possibleduring free fall

The Lander Operating Principle

Mission Duration 8h to 12 months

The Lander Operating Principle

Ship ReturnsAcoustic CommandsActivated

The Lander Operating Principle

Ballast ReleaseAscent Commences

The Lander Operating Principle

Surface, Spotting flagVHF DF + ARGOSData retrieved on board ship

ISIT Lander

ISITcamera

Currentmeter

ballast

MORS acousticreleases

controller

Profile mode

Splat Screen

Camera

ControllerRecorder

CTD ISIT profiler

ISIT Camera profile mode with ‘Splat Screen’ in field of view

April 20010

1000

2000

3000

4000

5000

0 20 40 60 80

Number of events (m-3)

De

pth

(m

)

18-Apr 19-Apr 21-Apr 26-Apr 26-Apr (2)

August 20010

1000

2000

3000

4000

5000

0 20 40 60 80

Number of events (m-3)

De

pth

(m

)

17-Aug 19-Aug 22-Aug 23-Aug25-Aug 27-Aug

Gelatinous impacts (2400m)

Large impact (1100m)

Interaction of Luminescent Organisms with an Array

Spontaneous

Impact Shear

Adhesion

Trapped

Water flow

Biological Factors Detected by an Array

• Abundance of organisms

• Species• Size• Status –

(reproductive, juvenile, larvae)

• Locomotor Ability

• Spontaneous emissions– Inter-specific interactions – Intra-specific interactions

• Stimulated emissions– Water flow velocity– Impacts– Shear stress– Adhesion– Entrapment

Bioluminescence Detected by an Array

1. Decrease with depth2. Seasonal change3. Spontaneous luminescence likely

to be unimportant 4. Luminescence stimulated by the

array may be dominant5. Adhesion and entrapment of

organisms on the array will be be problematic at certain times and depths

The End