Optical Assessment of Particles and Sedimentation

Processes of theTwilight Zone

Jim Bishop (LBNL)S E. Wilson (VIMS)

and T.J. Wood (LBNL) Thanks to many, especially ….VERTIGO investigators at sea

And … crew and captain of R/V Revelle

Funding: DOE/Biological and Environmental Research Program

And NSF (OCE) for ship time access

MULVFS

POC/PIC& Scattering

Sensors on CTD

Imaging FluxRecorder

Target: Biological pump and export of C to depth

PICPIC

Goal: Understand Twilight Zone ProcessesHow: Pioneer autonomous high frequency obs

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TransmissometerPOC (uM)

0 1 2 3 4 0 1 2 3 4Pressure (dBars)

0 1

K2 ALOHA

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D1 D2

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QUANTITATIVE DIGITAL PHOTOGRAPHYOF > 51 m particles from MULVFS

Gives at sea assessment of biological pump

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10 X DIFFERENCE IN >51 MATERIAL

K2

ALOHA

Optical Sediment Trap

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CarbonFlux

Recorder

DepthRecorder

GPS,tracking

ElastomerDampingSystem

Main buoy/Strobe/RF

Nylon Rope

floation

Optical Carbon Flux Recorder - twined instrumentsthird generation prototype

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Camera, 3 lighting modesSeparates POC and PIC Flux

1146 UTC 2246 L

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1422 UTC 0122 L

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1658 UTC 0358 L

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1933 UTC 0633 L

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2208 UTC 0908 L

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0044 UTC 1144 L

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0319 UTC 1419 L

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0555 UTC 1655 L

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QUANTITATIVE ANALYSIS

Image cycle number

Clean

60 cycles / 24 hours

Swimmer in trap

K2 18 00 1206 18night day

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Dark Field OST Aug 5-6 2006

1658 UTC 0358 L

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EGGS

K218 00 1206 18

night day

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Inst 1Inst 1

2 3 4 5

Inst 3Inst 3

“Swimmers”6:30 11:45 16:50 18:301:37

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K218 00 1206 18

night day MOST SWIMMERS

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FEWLARGEAGGS.

Summary: (1) SURFACE POC concentration

differences (ALOHA- K2) not strongly indicative of Export Strength (cf. Lam HBLE talk)

TWILIGHT POC LEVELS DO.SPIKES IN XMISS PROFILES => ZOOPLANKTON

(2) MULVFS SAMPLES PERMIT REAL TIME QUANTITATIVE ASSESSMENT OF

LARGE PARTICLE ABUNDANCE(cf. 10X Contrast between K2 and

ALOHA)

MORE COMING SOON… CHEMISTY - SIZE ANALYSIS

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Summary: (3) OPTICAL TRAP:

NEW!!! 24 minute flux !!!high frequency detail of particle sedimention. Food Web (egg rain event, diurnal

swimmers, etc.)

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And …

Summary: (3) OPTICAL TRAP:

NEW!!! 24 minute flux !!!high frequency detail of particle sedimention. Food Web (egg rain event, diurnal

swimmers, etc.)

June 21 2005

ONE MORE STEP forCarbon FLUX Explorer

Development - HOUR

RESOLUTION OF SEDIMENTATION FOR MONTHS

IN REAL TIME

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Preliminary ICP-MS resultsMULVFS - Aloha vs K2 1-53 um

P

ALOHAK2

Ca

Sr

500

Sr

5000

Ba

Mn