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Observe


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Secchi-observation Form


Secchi-disk in water Photo: Heikki Kiviluoto

Please submit your Visibility Depth / Secchi-Disk Observations using the form below. Instructions for making Secchi-disk observations can be found here. You can also download the Secchi-leaflet [pdf, 1 MB] for further instructions.

Instructions on how to make other observations can be found here.


*Please, tell us your nickname
*Please state the visibility depth
*Please, tell us the date you took the visibility depth!
*Plesee, tell us the location, where you made the observation!
 

Secchi-disk

 
 
 

Secchi-disk is a round disc, which is used in Marine Research to measure visibility depth. The disk was developed by the Pope’s scientific advisor Pietro Angelo Secchi in 1865. The idea for the disk came from a white ceramic plate that was dropped in the sea and glowed from the depths. In order to get coherent results the measurements are usually made with a 30 cm disk.

 
 

SECCHI-leaflet.pdf [pdf, 1 MB]