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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  31 Oct 2020

31 Oct 2020

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This preprint is currently under review for the journal ESSD.

Global maps of Forel-Ule index, hue angle and Secchi disk depth derived from twenty-one years of monthly ESA-OC-CCI data

Jaime Pitarch1,2, Marco Bellacicco3, Salvatore Marullo1,3, and Hendrik J. van der Woerd4 Jaime Pitarch et al.
  • 1Consiglio Nazionale delle Ricerche (CNR), Istituto di Scienze Marine (ISMAR), Via Fosso del Cavaliere 100, 00133 Rome, Italy
  • 2NIOZ Royal Netherlands Institute for Sea Research, Department of Coastal Systems, and Utrecht University, PO Box 59, 1790AB Den Burg, Texel, The Netherlands
  • 3Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), Via E. Fermi 45, 00044 Frascati, Italy
  • 4Institute for Environmental Studies (IVM), Water & Climate Risk, Vrije Universiteit Amsterdam, De Boelelaan 1111, 1081HV Amsterdam, The Netherlands

Abstract. We document the development and public release of a new dataset (1997–2018), consisting of global maps of the Forel-Ule index, hue angle and Secchi disk depth. Source data comes from the European Space Agency (ESA) Ocean Colour (OC) Climate Change Initiative (CCI), which is providing merged multi-sensor data from the mid-resolution sensors in operation at a specific time from 1997 to the present day. Multi-sensor satellite datasets are advantageous tools for ecological studies because they increase the probabilities of cloud-free data over a given region, as data from multiple satellites whose overpass times differ by a few hours are combined. Moreover, data merging from heritage and present satellites can expand the duration of the time series indefinitely, which allows the calculation of significant trends. Additionally, data are remapped consistently and analysis-ready for scientists. Also, the products described in this article have the exclusive advantage of being linkable to in-situ historic observations and thus enabling the construction of very long time series. Monthly data are presented at a spatial resolution of ~4 km at the equator and are available at PANGAEA, (Pitarch et al., 2019a). Two smaller and easier to handle test datasets have been produced from the former: a global dataset at 1 degree spatial resolution and another one for the North Atlantic at 0.25 degree resolution.

Jaime Pitarch et al.

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Jaime Pitarch et al.

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Twenty years of monthly global maps of Hue angle, Forel-Ule and Secchi disk depth, based on ESA-OC-CCI data Pitarch, Jaime, van der Woerd, Hendrik J., Brewin, Robert J. W., and Zielinski, Oliver

Jaime Pitarch et al.


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Latest update: 27 Nov 2020
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 few days with a harmonized methodology, reaching resolutions of few kilometers. In this paper, 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-year long and has global coverage.
Ocean monitoring is crucial to understand the regular seasonality and the drift induced by...