Water Chemistry
Comparisons
Fall 2006
Nutrients in lake water

Phosphorus
Total phosphorus (TP)
 Total dissolved phosphorus


Silica

Chrysophyta - diatoms
Silica
Secchi Disc – Light - Weather
Methods:
•Secchi Disc
•Light meter (deck and spherical)
Calculated:
•Extinction coefficient
(nt=nw+nd+nc+np)
•Vertical light attenuation (Iz = Io e-nz)
Secchi Depth
Oneida
Onondaga
Vanish
Depth (m)
Wolf
Green
Reappear
Depth (m)
Catlin
Arbutus
0
2
4
6
Depth (m)
8
10
Extinciton Coefficient of Each Lake
Extincition Coefficient
0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
0
Depth (m)
5
Onondaga
Catlin
Oneida
10
15
20
25
* Depth began at 1 m, not at surface due to irregularity of surface
Green
Wolf
Arbutus
Light Intensity of Each Lake
Irradiance
0.00
0
Depth (m)
5
40.00
80.00
120.00
160.00
Arbutus
Wolf
Green
10
Oneida
Onondaga
15
20
25
Catlin
Comments

Weather
Onondaga and Green lake downpours
 Most often cloudy
 Windy

Errors:
 Wind caused secchi errors
 Clouds limited light availability
 Light measurements taken the next day