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Spotting Green Tides over Brittany from Space: Three Decades of Monitoring with Landsat Imagery

Remote sensing (Basel, Switzerland), 2021-04, Vol.13 (8), p.1408 [Peer Reviewed Journal]

2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 2072-4292 ;EISSN: 2072-4292 ;DOI: 10.3390/rs13081408

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  • Title:
    Spotting Green Tides over Brittany from Space: Three Decades of Monitoring with Landsat Imagery
  • Author: Schreyers, Louise ; van Emmerik, Tim ; Biermann, Lauren ; Le Lay, Yves-François
  • Subjects: Algae ; Archives & records ; Biomass ; Drainage ; earth observation ; Ecosystems ; Estimates ; eutrophication ; Geography ; Google Earth Engine ; Green tides ; Humanities and Social Sciences ; Landsat ; Landsat satellites ; macroalgae ; Nitrogen ; Normalized difference vegetative index ; Remote monitoring ; Remote sensing ; satellite ; Satellite imagery ; Satellites ; Seasonal variations ; Trends
  • Is Part Of: Remote sensing (Basel, Switzerland), 2021-04, Vol.13 (8), p.1408
  • Description: Green tides of macroalgae have been negatively affecting the coasts of Brittany, France, for at least five decades, caused by excessive nitrogen inputs from the farming sector. Regular areal estimates of green tide surfaces are publicly available but only from 2002 onwards. Using free and openly accessible Landsat satellite imagery archives over 35 years (1984–2019), this study explores the potential of remote sensing for detection and long-term monitoring of green macroalgae blooms. By using a Google Earth Engine (GEE) script, we were able to detect and quantify green tide surfaces using the Normalized Difference Vegetation Index (NDVI) and Normalized Difference Water Index (NDWI) at four highly affected beaches in Northern Brittany. Mean green tide coverage was derived and analyzed from 1984 to 2019, at both monthly and annual scales. Our results show important interannual and seasonal fluctuations in estimated macroalgae cover. In terms of trends over time, green tide events did not show a decrease in extent at three out of four studied sites. The observed decrease in nitrogen concentrations for the rivers draining the study sites has not resulted in a reduction of green tide extents.
  • Publisher: Basel: MDPI AG
  • Language: English
  • Identifier: ISSN: 2072-4292
    EISSN: 2072-4292
    DOI: 10.3390/rs13081408
  • Source: Open Access: DOAJ Directory of Open Access Journals
    HAL SHS: Archive ouverte en Sciences de l'Homme et de la Société (Open Access)
    AUTh Library subscriptions: ProQuest Central
    Hyper Article en Ligne (HAL) (Open Access)
    ROAD: Directory of Open Access Scholarly Resources
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