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Light Attenuation In Water. Results From 5 Regional Lakes. Light Measurements (LI-COR). Scalar. Concerned w/ PAR Require both scalar (underwater) and cosine (surface) sensors Units: m mol quanta m -2 s -1 ( m E). Light Calculations. Exponential Decay Beer’s Law

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light attenuation in water

Light Attenuation In Water

Results From 5 Regional Lakes

light measurements li cor
Light Measurements (LI-COR)

Scalar

  • Concerned w/ PAR
  • Require both scalar (underwater) and cosine (surface) sensors
  • Units: mmol quanta m-2 s-1 (mE)
light calculations
Light Calculations
  • Exponential Decay
    • Beer’s Law
    • Compute Ln(Iz) and regress to get slope
    • Slope = attenuation coefficient, k [m-1]
  • Secchi Disk

Iz = I0 e - kz

light attenuation wolf lake
Light Attenuation: Wolf Lake
  • k = 0.477 m-1
  • Secchi: 4.9 m
  • Overcast, rain, windy
  • Pristine but w/ high DOC content
light attenuation arbutis lake
Light Attenuation: Arbutis Lake
  • k = 0.891 m-1
  • Secchi: 2.9 m
  • Heavy cloud cover, slight breeze
  • Slightly more ‘brackish’ than Wolf (visual speaking)
light attenuation green lake
Light Attenuation: Green Lake
  • k = 0.174 m-1
  • Secchi: 8 m
  • Sunny, slight breeze
  • Oligotrophic w/ high CaCO3 content
light attenuation onondaga lake
Light Attenuation: Onondaga Lake
  • k = 0.506 m-1 (?)
  • Secchi: 1.9 m
  • Overcast w/ moderate wind
  • Hypereutrophic (but does have its good days; i.e. clearing)
light attenuation oneida lake
Light Attenuation: Oneida Lake
  • k = 1.20 m-1
  • Secchi: 2.6 m
  • Conditions unknown (PAR measurements done separately)
  • Eutrophic (and shallow)
light summary k secchi
Light Summary: k, Secchi
  • Drivers:
    • Wolf/Arbutis: CDOM
    • Oneida: chlorophyll
      • light measurement and Secchi on different days
    • Onondaga: low k value doesn’t make sense but…
    • Green: Beautiful but boring…