:This has not been indubitably proven, but measurements using a Secchi disk and satellite analysis showed that the oceanic plankton population declined by 40 % in the last 60 years.
22.
I think he's talking about a relatively healthy lake in regard to the Secchi disk and clarity .-- talk ) 03 : 58, 19 November 2007 ( UTC)
23.
This citizen science Secchi disk study combines the traditional plain white, 30 cm diameter marine Secchi disk with mobile technology to upload Secchi depth data collected from the sea to a central database.
24.
This citizen science Secchi disk study combines the traditional plain white, 30 cm diameter marine Secchi disk with mobile technology to upload Secchi depth data collected from the sea to a central database.
25.
A Secchi disk measurement should always be taken off the shady side of a boat or dock between 9 am and 3 pm The period for best results is between 10 am and 2 pm.
26.
Similarly, the Indiana Clean Lakes Program trains and relies on volunteers to monitor turbidity in over 80 Indiana lakes using secchi disks, and uses data submitted by volunteers to monitor lake quality in the state.
27.
Secchi disk measurements have been an integral component of Minnesota's and Wisconsin's lake water quality assessment programs for some time; lake residents make periodic measurements and submit their readings to state and local agencies.
28.
This includes 19 years of secchi disk data ( transparency ), 19 years of phosphorus data, 16 years of chlorophyll-a ( Chl-a ) data, and 3 years of dissolved oxygen ( DO ) data.
29.
A Secchi disk depth of as little as 1 metre is not uncommon after windy days . Water quality, however, is still considered to be good, and in fact, among the best in Saskatchewan's parks.
30.
During this period 29 years of secchi disk transparency data, 9 years of phosphorus data, 5 years of chlorophyll-a ( Chl-a ) data, and 17 years of dissolved oxygen ( DO ) data has been taken.
