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Discussion papers
https://doi.org/10.5194/essd-2020-33
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-33
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: data description paper 24 Feb 2020

Submitted as: data description paper | 24 Feb 2020

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This preprint is currently under review for the journal ESSD.

Global distribution of photosynthetically available radiation on the seafloor

Jean-Pierre Gattuso1,2, Bernard Gentili1, David Antoine1,3, and David Doxaran1 Jean-Pierre Gattuso et al.
  • 1Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, 181 chemin du Lazaret, 06230Villefranche-sur-mer, France
  • 2Institute for Sustainable Development and International Relations, Sciences Po, 27 rue Saint Guillaume, 75007 Paris,France
  • 3Remote Sensing and Satellite Research Group, Curtin University, Perth, Western Australia, 6845, Australia

Abstract. A 21-year (1998–2018) continuous monthly data set of the global distribution of light (photosynthetically available radiation; PAR) reaching the seabed is presented. It uses ocean colour and bathymetric data to estimate benthic irradiance, offering critical improvements on a previous data set (Gattuso et al., 2006). The time series is 4 times longer (21 vs 5 years), the spatial resolution is better (pixel size of 4.6 vs 9.3 km at the equator) and the bathymetric resolution is also better (pixel size of 0.46 vs 3.7 km at the equator). The paper describes the theoretical and methodological bases and data processing. This new product is used to estimate the surface area of the sea floor where (1) light does not limit the distribution of photosynthetic benthic organisms and (2) net community production is positive. The complete data set is provided as 14 netCDF files available on PANGAEA (https://doi.pangaea.de/10.1594/PANGAEA.910898). The R package CoastalLight, available on Github (https://github.com/jpgattuso/CoastalLight.git), allows (1) to download geographical and optical data from PANGAEA and (2) to calculate the surface area that receives more than a given threshold of irradiance in three regions (non polar, Arctic and Antarctic). Such surface areas can also be calculated for any sub-region after downloading data from a remotely and freely accessible server.

Jean-Pierre Gattuso et al.

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Status: open (until 06 May 2020)
Status: open (until 06 May 2020)
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Jean-Pierre Gattuso et al.

Data sets

Photosynthetically available radiation (PAR) on the seafloor calculated from 21 years of ocean colour satellite data B. Gentili and J.-P. Gattuso https://doi.pangaea.de/10.1594/PANGAEA.910898

Model code and software

CoastalLight: R package to calculate the light reaching the ocean sea floor B. Gentili and J.-P. Gattuso https://doi.org/10.5281/zenodo.3685556

Jean-Pierre Gattuso et al.

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Short summary
Light is a key ocean variable shaping the composition of benthic and pelagic communities by controlling the three-dimensional distribution of primary producers. It also plays a major role in the global carbon cycle. We provide a continuous monthly data set of the global distribution of light reaching the seabed. It is 4 times longer (21 vs. 5 years) than the previous data set, the spatial resolution is better (4.6 vs. 9.3 km) and the bathymetric resolution is also better (0.46 vs. 3.7 km).
Light is a key ocean variable shaping the composition of benthic and pelagic communities by...
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