Editing Secchi disk (section)

==Applications==
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. The aggregated longitudinal data are used to reveal general trends in water quality. 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.<ref>{{cite web |title=Indiana Clean Lakes Program – Volunteer Monitoring |url=http://www.indiana.edu/~clp/volunteermonitoring.php |work=www.indiana.edu |access-date=9 February 2011}}</ref>

In 2013, a team of marine scientists established the global citizen science Secchi Disk program for seafarers to study marine phytoplankton.<ref>{{cite web |url=http://www.secchidisk.org |title=Marine Secchi Disk study |work=www.secchidisk.org}}</ref> This ongoing citizen science Secchi Disk study combines the traditional plain white, 30&nbsp;cm diameter marine Secchi Disk with mobile technology to upload Secchi depth data collected from the sea to a central database. The study's first scientific results were published in 2017.<ref>{{cite journal |doi= 10.1371/journal.pone.0186092|pmid= 29211734|pmc= 5718423|title= Seafarer citizen scientist ocean transparency data as a resource for phytoplankton and climate research|journal= PLOS ONE|volume= 12|issue= 12|pages= e0186092|year= 2017|last1= Seafarers|first1= Secchi Disk|last2= Lavender|first2= Samantha|last3= Beaugrand|first3= Gregory|last4= Outram|first4= Nicholas|last5= Barlow|first5= Nigel|last6= Crotty|first6= David|last7= Evans|first7= Jake|last8= Kirby|first8= Richard|bibcode= 2017PLoSO..1286092S|doi-access= free}}</ref> The Secchi Disk study was begun in response to a controversial scientific report that suggested the phytoplankton that influences water transparency had declined by 40% in the oceans between the years 1950 and 2008.<ref>{{cite journal |url=https://www.nature.com/news/2010/100728/full/news.2010.379.html |doi= 10.1038/news.2010.379|title= Ocean greenery under warming stress|journal= Nature|year= 2010|last1= Schiermeier|first1= Quirin|doi-access= free|url-access= subscription}}</ref><ref>{{cite journal |doi=10.1038/nature09268 |pmid=20671703 |title=Global phytoplankton decline over the past century |journal=Nature |volume=466 |issue=7306 |pages=591–596 |year=2010 |last1=Boyce |first1=Daniel G. |last2=Lewis |first2=Marlon R. |last3=Worm |first3=Boris |bibcode=2010Natur.466..591B|s2cid=2413382 }}</ref>