Preprints
https://doi.org/10.5194/bg-2022-100
https://doi.org/10.5194/bg-2022-100
 
24 May 2022
24 May 2022
Status: this preprint is currently under review for the journal BG.

Interdisciplinary strategy to survey phytoplankton dynamics of a eutrophic lake under rain forcing: description of the instrumental set-up and first results

Fanny Noirmain1, Jean-Luc Baray2, Frédéric Tridon3, Philippe Cacault4, Hermine Billard1, Guillaume Voyard5, Joël Van Baelen6, and Delphine Latour1 Fanny Noirmain et al.
  • 1Université Clermont Auvergne, CNRS, Laboratoire Microorganismes : Genome, Environnement (LMGE), UMR6023, Clermont-Ferrand, France
  • 2Université Clermont Auvergne, CNRS, Laboratoire de Météorologie Physique (LaMP), UMR6016, Clermont-Ferrand, France
  • 3Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Turin, Italy
  • 4Université Clermont Auvergne, CNRS, Observatoire de Physique du Globe de Clermont Ferrand (OPGC), UAR833, Clermont-Ferrand, France
  • 5Université Clermont Auvergne, CNRS, Institut de Chimie de Clermont Ferrand (ICCF), UMR6296, Clermont Ferrand, France
  • 6Université de la Réunion, CNRS, Météo-France, Laboratoire de l’Atmosphère et des Cyclones (LACy), UMR8105, St Denis de la Réunion, France

Abstract. We present an interdisciplinary investigation of the links between rain macro and microphysical properties, meteorological parameters, and a mountain lake to assess the impact of precipitation events on phytoplankton dynamics and, in particular, on cyanobacteria. In order to document this interdisciplinary scientific question, the Aydat lake in the French massif central mountains has been instrumented in 2020 with a set of high-resolution atmospheric radars, disdrometer, and precipitation collector. In parallel, the lake was monitored with a suite of sensors and water sampling. To illustrate the potential of this original experimental setup, we present a rain case study that occurred in September 2020 and during which three contrasted sub-periods were identified. Using our high temporal-resolution monitoring, we show that the air mass origin mainly influences the rain nutrient composition, which depends on the type of rain, convective or stratiform. Our results also highlighted a non-negligible presence of photosynthetic cells in all rains, but their very low abundance can probably not impact the phytoplankton dynamics. Nevertheless, rain events indirectly impacted phytoplankton assemblages. Indeed, among all phytoplankton genera, three cyanobacteria, Microcystis, Coelomoron, and Merismopedia, showed a similar pattern with a systematic punctual decrease of their abundance at the lake surface immediately after rain events, suggesting a different impact of rain events according to the cyanobacterial genus considered. These various phytoplankton responses subjected to the same rainfall event could play a key role in phytoplankton dynamics in the temperate zone. Our results highlight the interest in high-frequency and time resolution monitoring of both atmosphere and lake to better understand the cyanobacteria adaptive strategies following rain events.

Fanny Noirmain et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2022-100', Anonymous Referee #1, 22 Jun 2022
    • AC2: 'Reply on RC1', Fanny Noirmain, 21 Jul 2022
    • AC3: 'Reply on RC1', Fanny Noirmain, 21 Jul 2022
  • RC2: 'Comment on bg-2022-100', Anonymous Referee #2, 28 Jun 2022
    • AC1: 'Reply on RC2', Fanny Noirmain, 21 Jul 2022
    • AC4: 'Reply on RC2', Fanny Noirmain, 21 Jul 2022

Fanny Noirmain et al.

Fanny Noirmain et al.

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Short summary
We present a study linking rain, meteorology, and mountain lake phytoplankton dynamics on the base of a case study at Aydat (France) in September 2020. The air mass origin mainly influences the rain nutrient composition, which depends on the type of rain, convective or stratiform. Our results also highlighted a non-negligible presence of photosynthetic cells in rainwater. The impact of the atmospheric forcing on the lake could play a key role in phytoplankton dynamics in the temperate zone.
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