Comparison of light in six New York lakes Amanda Davis Lauren Jetty Jennifer Mokos Justen Walker.

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Presentation transcript:

Comparison of light in six New York lakes Amanda Davis Lauren Jetty Jennifer Mokos Justen Walker

Why study light in lakes? Light drives photosynthesis. Light heats the lake. (thermal structure) Light regulates biota. (orientation, predation) Light can damage biota.

Absorption and scattering attenuate light within the water column Light is absorbed (transferred to heat) with depth. Light is scattered by particles within the water column.

The decrease in the amount of light with depth is determined by: I z = I 0 e -kz Where: I 0 = light intensity at the lake surface I z = light intensity at depth z k = attenuation coefficient z = depth (m)

Determine light attenuation using a light meter Deck probe measures surface irradiance Spherical probe measures irradiance at depth z

Correct irradiance for surface readings Deck o = 1964 Deck 1 = 2047 Spherical 1 = For I at depth z = 1: Deck 1 / Deck o * Spherical 1 = 2047 / 1694 * =

Convert to a linear plot by taking the log of both sides ln I z = ln I o - kz How do we determine k? y = mx +b k is the slope of the line.

Use regression analysis to determine k for each lake.

Light attenuation in lakes (highest to lowest) Catlin Lake Arbutus Lake Rich Lake Onondaga Lake Oneida Lake Green Lake

What affects light attenuation? Scattering due to water (K water ) Dissolved organics - humic & fulvic acids (K dissolved organics ) Particulates - tripton & phytoplankton (K particulates ) K = (K water ) + (K dissolved organics ) + (K particulates )

Are particulates responsible for light attenuation patterns?

Secchi Depth Inexpensive estimate of light attenuation Average between depth disc vanishes and depth it reappears Roughly estimates 10% of surface light

Secchi depth in lakes (lowest to highest) Onondaga Lake Oneida Lake Arbutus Lake Rich Lake Catlin Lake Green Lake

Summary

Bonus: Who’s behind the secchi disc?