Optical Measurements made by the Miller group

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Optical Measurements made by the Miller group

-depth profiles of downwelling irradiance (Ed)
from 305 - 700 nm -yields depth profiles of
PAR -surface measurements of downwelling
irradiance (Ed) from 325 - 700 nm measured every
10 seconds through each day -from which we can
calculate surface PAR -upwelling radiance (Lu)
from 305 - 700 nm -CDOM absorption spectra

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R. Davis
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What does a light profile look like??
Downwelling irradiance, uW/cm2
Depth, m
July 18 in
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PAR 1 light levels
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Surface Reflectance (UV / Vis)
R. Davis
R. Powell
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CDOM particulate water
Blue
green
What SeaWiFS measures
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R. Powell
MVDS - with modeled data
M. Levasseur
8
4
mg m-3
1
0.1
The patch
July 29/02 SeaWiFs Chlorophyll (Garver-Seigel-Mari
torena)
9
4
July 29/02 1x1 km zoom SeaWiFs Chlorophyll
(Garver-Seigel-Maritorena)
mg m-3
1
0.1
10
1.5
July 29/02 1x1 km zoom aCDOM(340) in house
algorithm
1
0.1
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Summary of what we have (can provide)

• For a total of 22 stations over 19 days both in
  and out of the patch
• Profiles of
• Downwelling irradiance (Ed)
• Depth of photic zone, PAR profiles --interest for
  those working on primary productivity?
• rel. fluorescence, temperature, rel.
  conductivity
• Surface downwelling irradiance through out the
  day
• PAR, Primary productivity - deck incubations? ,
  DMS models?
• Discrete measurements of upwelling irradiance
• Important for ground truthing SeaWiFs
  measurements

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Whats been done so farwhere to go from here

• Data thats been processed and is in good working
  order
• Ed profiles -Lu spectra
• PAR profiles -Kd spectra (optic depth)
• CDOM absorption spectra
• Data that needs a little TLC before its ready to
  go
• MVDS data scaled to modeled data
• Rel. fluorescence, rel conductivity and temp
  plots from optics casts
• Still to do
• Analyze DOC samples!!! --correlations between
  DOC and optics?
• Incorporate what we know about optics into
  photochemical models (Bill)