Seafarer citizen scientist ocean transparency data as a resource for phytoplankton and climate research

The oceans’ phytoplankton that underpin the marine food chain appear to be changing in abundance due to global climate change. Here, we compare the first four years of data from a citizen science ocean transparency study, conducted by seafarers using home-made Secchi Disks and a free Smartphone application called Secchi, with contemporaneous satellite ocean colour measurements. Our results show seafarers collect useful Secchi Disk measurements of ocean transparency that could help future assessments of climate-induced changes in the phytoplankton when used to extend historical Secchi Disk data.

[1]  Watson W. Gregg,et al.  Recent decadal trends in global phytoplankton composition , 2015 .

[2]  David A. Siegel,et al.  Revaluating ocean warming impacts on global phytoplankton , 2016 .

[3]  John P. Dunne,et al.  A measured look at ocean chlorophyll trends , 2011, Nature.

[4]  B. Franz,et al.  Examining the consistency of products derived from various ocean color sensors in open ocean (Case 1) waters in the perspective of a multi-sensor approach , 2007 .

[5]  MOMENTUM EFFECTS IN ELECTRIC DISCHARGE. , 1908, Science.

[6]  S. Petrovskii,et al.  Mathematical Modelling of Plankton–Oxygen Dynamics Under the Climate Change , 2015, Bulletin of mathematical biology.

[7]  Walter H. F. Smith,et al.  Global Sea Floor Topography from Satellite Altimetry and Ship Depth Soundings , 1997 .

[8]  David A. Siegel,et al.  Global assessment of ocean carbon export by combining satellite observations and food‐web models , 2014 .

[9]  R. Bidigare,et al.  Is there a decline in marine phytoplankton? , 2011, Nature.

[10]  B. Worm,et al.  Global phytoplankton decline over the past century , 2010, Nature.

[11]  J. Randerson,et al.  Primary production of the biosphere: integrating terrestrial and oceanic components , 1998, Science.

[12]  J. Sarmiento,et al.  Reconciling fisheries catch and ocean productivity , 2017, Proceedings of the National Academy of Sciences.

[13]  T. Aarup.  Transparency of the North Sea and Baltic Sea - a Secchi depth data mining study , 2002 .

[14]  D. Pauly,et al.  Primary production required to sustain global fisheries , 1995, Nature.

[15]  W. Gieskes,et al.  The impact of phytoplankton on spectral water transparency in the Southern Ocean: implications for primary productivity , 1994, Polar Biology.

[16]  Bryan A. Franz,et al.  Chlorophyll aalgorithms for oligotrophic oceans: A novel approach based on three‐band reflectance difference , 2012 .

[17]  D. Mackas.  Does blending of chlorophyll data bias temporal trend? , 2011, Nature.

[18]  Rudolph W. Preisendorfer,et al.  Secchi disk science: Visual optics of natural waters1 , 1986 .

[19]  S. Piontkovski,et al.  Subsurface algal blooms of the northwestern Arabian Sea , 2017 .

[20]  M. Wernand,et al.  On the history of the Secchi disc , 2010 .

[21]  Nick Green,et al.  The Royal Society , 1897, Nature.

[22]  T. Platt,et al.  An estimate of global primary production in the ocean from satellite radiometer data , 1995 .

[23]  T. Wilbanks,et al.  Contribution of Working Group II to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change , 2007 .

[24]  R. Murtugudde,et al.  A reduction in marine primary productivity driven by rapid warming over the tropical Indian Ocean , 2016 .

[25]  Hans-Otto Pörtner,et al.  Cross-chapter box on net primary production in the ocean , 2014 .

[26]  F. Chavez,et al.  Biological Heating in the Equatorial Pacific: Observed Variability and Potential for Real-Time Calculation , 2004 .