L3 Light in Lakes Flashcards
1
Q
Diurnal
A
Day
2
Q
Diel
A
Day-night (24hr cycle)
3
Q
Nocturnal
A
Night
4
Q
Crepuscular
A
Dawn & dusk e.g. walleye
5
Q
Secchi disk
A
Measures transparency of water, gives the depth of the photic zone
6
Q
Intensity
A
photons per area
7
Q
wavelength
A
gives an indication of energy level
8
Q
PAR
A
Photosynthetically active radiation
9
Q
Angle of incidence
A
Determines the angle of the light, whether it will bounce off or go straight into water.
10
Q
indirect energy light
A
scattering from clouds, mountains (20% of direct)
11
Q
direct energy light
A
trees, snow, clouds, ice (black)
12
Q
Reflected light
A
bounced off water
13
Q
Refracted light
A
Light bent as it travels b/w substances of different optical densities
14
Q
Absorbed light
A
Light E converted to heat E
15
Q
Scattered light
A
Light scattered by particles in water
