Articles | Volume 13, issue 2
Earth Syst. Sci. Data, 13, 481–490, 2021
Earth Syst. Sci. Data, 13, 481–490, 2021
Data description paper
16 Feb 2021
Data description paper | 16 Feb 2021

Global maps of Forel–Ule index, hue angle and Secchi disk depth derived from 21 years of monthly ESA Ocean Colour Climate Change Initiative data

Jaime Pitarch et al.

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Cited articles

Boyce, D. G., Lewis, M., and Worm, B.: Integrating global chlorophyll data from 1890 to 2010, Limnol. Oceanogr.-Meth., 10, 840–852,, 2012. 
Ceccaroni, L., Piera, J., Wernand, M. R., Zielinski, O., Busch, J. A., Woerd, H. J. v. d., Bardaji, R., Friedrichs, A., Novoa, S., Thijsse, P., Velickovski, F., Blaas, M., and Dubsky, K.: Citclops: A next-generation sensor system for the monitoring of natural waters and a citizens' observatory for the assessment of ecosystems' status, PLOS ONE, 15, e0230084,, 2020. 
IOCCG: Ocean-colour data merging, Reports of the International Ocean-Colour Coordinating Group, edited by: Gregg, W. W., International Ocean-Colour Coordinating Group, Dartmouth, Canada, No. 6, 2007. 
Jackson, T., Chuprin, A., Sathyendranath, S., Grant, M., Zühlke, M., Dingle, J., Storm, T., Boettcher, M., and Fomferra, N.: Ocean Colour Climate Change Initiative (OC_CCI)–Interim Phase, Product User Guide, D3.4 PUG, 2019. 
Kendall, M.: Rank correlation methods, 2nd impression, Charles Griffin and Company Ltd. London and High Wycombe, 1975. 
Short summary
Ocean monitoring is crucial to understand the regular seasonality and the drift induced by climate change. Satellites offer a possibility to monitor the complete surface of the Earth within a few days with a harmonized methodology, reaching resolutions of few kilometres. We revisit traditional ship survey optical parameters such as the Secchi disk depth and the Forel–Ule index and derive them from satellite observations. Our time series is 21 years long and has global coverage.