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Bermuda BioOptics Project

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Bermuda Bio-Optics Project. Decade-Plus Perspective on Ocean Color ... Bermuda ... Bermuda Bio-Optics Project. Overview - Data Streams. Time-series co ... – PowerPoint PPT presentation

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Title: Bermuda BioOptics Project


1
Bermuda Bio-Optics Project
  • Decade-Plus Perspective on Ocean Color

Norm Nelson, Dave Siegel Institute for Co
mputational Earth System Science, UCSB
2
Bermuda Bio-Optics Project
  • OverviewScience GoalsData StreamsAccomplishmen
    ts
  • A Look at the Time Series

3
Bermuda Bio-Optics ProjectOverview - Main
Science Goals
  • Understand processes controlling underwater light
    environment in the Sargasso Sea
  • Algorithm development(With Stéphane
    Maritorena)
  • Calibration and validation of ocean color sensors

4
Bermuda Bio-Optics ProjectOverview - Main
Science Achievements
  • Light, primary productivity, and photosynthetic
    quantum yield
  • Distribution and dynamics of CDOM(Sargasso Sea
    and global)
  • Photochemistry and DMS cycling

5
Bermuda Bio-Optics ProjectOverview - Data Streams
  • Time-series co-located with BATS(32N 64W),
    starting in 1991Also - frequent regional
    studies
  • Core MeasurementsEd, Es, Lu (7-14 l, BSI
    Satlantic radiometers)chl a (fluorometric)Sin
    ce 1994ap,ad (QFT)acdom (conventional UV-Vis
    spectroscopy)

6
Bermuda Bio-Optics ProjectOverview - Data Streams
  • Concurrent data from the BATS ProjectHydrography
    Carbon (inorganic, organic)NutrientsPrimary
    ProductionC and N flux (sediment
    traps)Phytoplankton pigments (HPLC)
  • Other BBOP data (not full time-series)AC-9
    absorption coefficient profilesLw(0), ASD
    FieldSpec radiometerLsun, Microtops sunphotometer

7
Bermuda Bio-Optics ProjectOverview - Data Streams
  • Radiometer calibration in house, using
    NIST-traceable standards, participated in SeaWiFS
    and SIMBIOS intercomparisons Same engineer for
    entire project (Dave Menzies)

8
Bermuda Bio-Optics ProjectRadiometry 14 year
time series
441 nm (MER)
441 nm (MER)
443 nm (SPMR)
9
Bermuda Bio-Optics ProjectAbsorption Coefficient
10 Year Time Series
  • Absorption Coefficient ComponentsCDOMPhytoplankt
    onDetritusPhytoplankton absorption ratios
    (440/674nm)
  • Are there interannual or longer term trends in
    addition to already-documented seasonal patterns?

10
BATS CDOM Profile
STMW
Surface Bleached Layer
STMW (18 Water)
Main Thermocline
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  • CDOM exhibits seasonal and interannual
    variability
  • Possible teleconnection to climate oscillators
    (NAO shown)

18
Control of CDOM at BATS
  • Annual Balance between local production and
    solar bleaching
  • Interannual Multi-year accumulation at depth and
    resetting by deeper winter mixing (similar to
    DOC patterns)

19
Absorption by Phytoplankton
  • Phytoplankton pigments dominate absorption
    (detrital contribution small, correlated with
    phytoplankton)
  • Strong seasonal cycle related to spring bloom
  • Seasonal change in absorption properties related
    to photoadaptation and seasonal succession of
    phytoplankton species
  • Primary production variability has been linked to
    climate oscillators such as ENSO

20
Particle Absorption
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Trends in Absorbing Components at BATS
  • CDOM abundance governed in part by physical
    processes possibly teleconnected to climate
    oscillators
  • Phytoplankton abundance and species succession
    has not varied along the same time scales

25
Conclusions (so far)
  • The BBOP time series is enabling us to observe
    and diagnose ocean color variations occurring on
    climate-oscillator time scales.
  • CDOM abundance apparently responds on these time
    scales
  • So far we are not seeing this in a dramatic way
    with the phytoplankton community

26
Acknowledgments
  • Ocean Biology and Biogeochemistry Program, NASA
  • Collaborators Ive not mentioned (there are many,
    thank you)
  • BBOP and BATS Project technicians, engineers, and
    students over the years (I could fill several
    slides)
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