Aquatic ecosystems - Light climate
11 important questions on Aquatic ecosystems - Light climate
What does turbidity in a water system mean?
What effect does low transparency of the water have on its quality?
What are inherent optical characteristics of water?
Scattering is caused by suspended particles, especially clay.
Organic and inorganic suspended matter ccontribute most to light absorption.
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What determines the absoption in water?
What is the law of Lambert-Beer
Iz: light intensity at water depth z
I0: light intentsity at the water surfacce
E: etinction coefficient/vertical light attenuation coefficient (based on wavelengths used by photosynthesis: PAR (photosynthetically active radiation))
What is scattering dependant on?
What is the Secchi depth?
The secchi depth is approximately inversely proportional to the vertical light attenuation coefficient: in a turbid lake the etinction coefficient is large and the Secchi depth is small
Why is the under water light climate important?
-less suitable for drinking or swimming
-hosts problematic algae
-lower species diversity
How can we calculate the amount of absorbed light in a water column?
How can the water turbidity be measured?
2) The Secchi depth
Which fraction of substances contibutes the moest to the total vertical light attenuation here?
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