28 Jul 2022
28 Jul 2022
Status: this preprint is currently under review for the journal ESSD.

How to learn more about hydrological conditions and phytoplankton dynamics and diversity in the eastern English Channel and the southern bight of the North Sea? the SRN data set (1992–2021)

Alain Lefebvre and David Devreker Alain Lefebvre and David Devreker
  • Ifremer, Unité Littoral, Laboratoire Environnement et Ressources, 150 quai Gambetta, BP 699, 62321 Boulogne-sur-mer, France

Abstract. This article describes the historical data series produced by the SRN network managed by Ifremer. Since 1992, the SRN (‘Suivi Régional des Nutriments’ in French; Regional Nutrients Monitoring Programme) network has been analysing phytoplankton species and measuring twelve physicochemical parameters at ten different stations distributed along three different transects located in the Eastern English Channel, and the Southern Bight of the North Sea. The SRN collects a maximum of 184 samples per year and detects up to 281 taxa, including harmful algal bloom species (HABs), with a bi-weekly to monthly sampling frequency (depending on the location and the season). The objectives of this monitoring program are to assess the influence of continental inputs on the marine environment, and their implications on possible eutrophication processes. It also aims to estimate the effectiveness of development and management policies in the marine coastal zone. The regular acquisition of data allows the establishment of a long-term monitoring of the evolution of coastal water quality, as well as the observation of the consequences of large-scale alterations and modifications that are more related to regional anthropogenic activities. This paper provides an overview of the main characteristics of SRN data (descriptive statistics and data series main patterns) as well as an analysis of temporal trends using specific numerical tools available as an R package to help make use of such data. Main results of several research projects are also highlighted providing the readers with examples of what is doable with such a data set.

Alain Lefebvre and David Devreker

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2022-146', Anonymous Referee #1, 09 Sep 2022 reply
  • RC2: 'Comment on essd-2022-146', Anonymous Referee #2, 10 Oct 2022 reply

Alain Lefebvre and David Devreker

Data sets

SRN - Regional Observation and Monitoring program for Phytoplankton and Hydrology in the eastern English Channel (2022). SRN dataset - Regional Observation and Monitoring Program for Phytoplankton and Hydrology in the eastern English Channel. Lefebvre Alain, Blondel Camille, Duquesne Vincent, Hebert Pascale, Cordier Remy, Belin Catherine, Huguet Antoine, Durand Gaetane, Soudant Dominique, Devreker David

Alain Lefebvre and David Devreker


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Short summary
The SRN dataset includes long-term time series on marine phytoplankton and physicochemical measures in the eastern English Channel and the southern bight of the North Sea. These data sets should be useful to compare contrasted coastal marine ecosystems to further knowledge about the direct and indirect effects of human pressures and environmental changes on ecosystem structure and function, including eutrophication and Harmful Algal Blooms issues.